Ask MetaFilter questions tagged with math
http://ask.metafilter.com/tags/math
Questions tagged with 'math' at Ask MetaFilter.Sat, 18 Oct 2014 07:08:30 -0800Sat, 18 Oct 2014 07:08:30 -0800en-ushttp://blogs.law.harvard.edu/tech/rss60Best cargo cult symbolic equation editor?
http://ask.metafilter.com/270171/Best%2Dcargo%2Dcult%2Dsymbolic%2Dequation%2Deditor
You're an armchair scientist and you like reading scientific papers. A lot of the fun ones include a lot of equations. You'd like to be able to recreate those equations in a virtual blackboard. You'd select terms and be able to replace them with a library of previous equations you've made. The blackboard would enforce whatever symbolic manipulation rules are required to maintain consistency (because you sure won't be able to). If you replace a term with a number or a data input, it does the calculations necessary to display properly. What is it? The best tool for this will be able to do literally everything visually with the symbols, i.e., no text-based programming language required to use the features described here.tag:ask.metafilter.com,2014:site.270171Sat, 18 Oct 2014 07:08:30 -0800bigbigdogMath, sweet sweet math
http://ask.metafilter.com/270088/Math%2Dsweet%2Dsweet%2Dmath
I have a set of data: D(t). 5000 samples. Scatter-graphing makes some patterns clear (D-mean increases with t, for instance). D and t are always positive. I want to characterize these, statistically. I've tried blindly trying to stumble upon a distribution model that fits D to t, but that worked about as well as you'd expect.<br>
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So, how do I go about testing if P(D, t) is a function of t, t^2, log(t), t^x, etc... ? That is, given an interval of [D1:D2], what is the probability distribution for t? (And vice versa.)tag:ask.metafilter.com,2014:site.270088Thu, 16 Oct 2014 13:03:27 -0800IAmBroomVicarious Math Pressure
http://ask.metafilter.com/269824/Vicarious%2DMath%2DPressure
My eldest child is starting high school. She is in the most advanced math class (a version of geometry) offered by her fairly demanding high school. But my eldest is struggling during the review of algebra -- rate problems, word problems, etc. Concerned because math is cumulative, and I don't want her falling behind. What can I do to help, both with math and with preventing her from becoming discouraged? My daughter is very intelligent. She tested into her advanced math class, and she has never received grades that were anything less than As. Now she's struggling a bit, though, and I would like to help her turn it around. I plan to have her speak to her teacher for his suggestions on how to improve her understanding and performance. If that fails, then I might try to find her a tutor, too, but it would be great to get the hive's thoughts on resources, books, programs, plans, or even just advice about how to help a 14 year-old girl through math that is more challenging than she has faced before. <br>
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Advice I may be considering internally but that I don't really need here: take her out of the advanced math; don't worry about math because it's not that important. Advice that would be wonderful: when I was a 14 year-old (or when I was parenting my 14 year-old) there was a similar problem that I solved by doing X, Y, and Z. Thanks so much.tag:ask.metafilter.com,2014:site.269824Fri, 10 Oct 2014 23:41:43 -0800Slap FactoryEssay question has too many permutations or am I overthinking this?
http://ask.metafilter.com/269674/Essay%2Dquestion%2Dhas%2Dtoo%2Dmany%2Dpermutations%2Dor%2Dam%2DI%2Doverthinking%2Dthis
For my son’s high school history class, he has been assigned an in-class argument/opinion essay. The teacher ended most of the lecturing this week and has given them time to prepare thesis statements for the essays. Here is where it starts to get complicated (at least to my son and me): What I want to know: <br>
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* What are the useful variable permutations of questions numbers 2 & 3 as explained below?<br>
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* Does this essay assignment seem a bit unreasonable?<br>
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There will be three possible questions for the essay. The students have been given all three to prepare. The teacher will pick one of these at random on the day of the essay:<br>
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1. Describe the extent and impact of new trading systems as they develop during this time period. <br>
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2. How do belief systems (Buddhism, Confucianism, Dao, Legalism, Christianity, Zoroastrianism) compare and what is the impact they had on their respective societies? <br>
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3. In the following areas explain the political development: Han China, South Asia, Greece, Rome, Persia and Mesoamerica. <br>
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The instructions are:<br>
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* 10 factual items of historical significance on the topic<br>
* At least 3 specific analytical statements (commentary) addressing the thesis, to prove their opinion<br>
* If question 2 or 3 is chosen on the day of the essay, the teacher will then pick at random two of the categories for that question. So for example, on the day of the essay the question may be “How do Christianity and Confucianism compare…” or “In Han China and Greece explain the political development”. Of course, it could be any two out of the list for each question.<br>
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My son’s is finding it difficult to prepare for the last two, as the variables are unknown until the day of the essay. In preparation, he is trying to formulate multiple thesis statements for each possible variable combination and come up with ten factual items that meaningfully correlate to those combined variables, as well as come up with three meaningful statements that support his thesis for each variable set. And then all of this needs to make a compelling argument.<br>
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I agree with him that it seems like a very difficult essay to prepare for. In his exasperation, he said it would take a mathematician to calculate are the variable combinations of (2x) variables + (10x) facts + (3x) commentary statements. I sat down and tried to figure it out, but I don’t math enough, so I think my formula of [n!/(n-r)! ] was wrong.<br>
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Again, my two questions:<br>
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What are the useful variable permutations of questions numbers 2 & 3 as explained below?<br>
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Does this essay assignment seem a bit unreasonable?tag:ask.metafilter.com,2014:site.269674Wed, 08 Oct 2014 09:27:48 -0800bionic.junkieIn a 2048 or Threes-like game, what is the highest possible score?
http://ask.metafilter.com/269599/In%2Da%2D2048%2Dor%2DThrees%2Dlike%2Dgame%2Dwhat%2Dis%2Dthe%2Dhighest%2Dpossible%2Dscore
In one of these puzzle games like 2048 or Threes, where you merge tiles to create higher numbers, is there any way to prove what is the highest possible tile number that can be created given the rules and dimensions? For example, if the 2048 game was played in a 3x3 space instead of a 4x4 space, would it still be possible to create 2048 in that space? If it was played in a 5x5 space, how much higher could we theoretically go? 8192? 32768?<br>
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Is there a way to figure out upper and lower bounds on different playfields?tag:ask.metafilter.com,2014:site.269599Mon, 06 Oct 2014 20:00:35 -0800RobotHeroCheat like a fox.
http://ask.metafilter.com/269339/Cheat%2Dlike%2Da%2Dfox
I have always been really bad at really simple games, like the ones where there are generally sound mathematical strategies for playing the optimal game. I'd like to compile a little mental rolodex of simple games and their solutions so I can feel smugly superior to any small children who seek to challenge me. For instance, tic tac toe has an optimal gameplay strategy.<br>
I imagine there's a smarter way to play battleship than to just guess at spaces.<br>
And probably the dots game (the one where you make the squares) has some strategy, too.<br>
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What are other games like this? What are their solutions?<br>
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I'd also be interested in hearing about mods to other games that make them more strategic and interesting. (Like for instance, I like to trade resource futures when I play Settlers. It opens the game up to gambling and risk.)<br>
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Really interested to see what you guys come up with!tag:ask.metafilter.com,2014:site.269339Wed, 01 Oct 2014 11:26:41 -0800phunniemeeApps for young readers
http://ask.metafilter.com/269075/Apps%2Dfor%2Dyoung%2Dreaders
What are your favorite iPad apps for 4 - 7 year olds? My almost-four-year-old son is an early reader. He can pick up adult books and read sentences out of them. It's hard for me to keep him from being bored. He loves his iPad mini, but tends to be most interested in games about characters and is easily swayed by in-game advertising. I'm not into either of those things. <br>
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I'd like to find some age-appropriate, awesome apps that will help him improve his reading and math skills, or teach him about science/the world, which he is very interested in. <br>
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I'm happy to pay for apps in exchange for no ads. (I'm tired of saying, "No, we are not buying extra widgets for twenty dollars!") <br>
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I'm looking for well-designed, educational apps like Leo's Pad, or actual books that have been app-ified. Googling gives me endless lists and no real sense of quality. Please tell me about your favorite iPad apps for 4 - 7 year olds.tag:ask.metafilter.com,2014:site.269075Fri, 26 Sep 2014 07:54:14 -0800woodvineGrammar/style for mathematicians?
http://ask.metafilter.com/268686/Grammar%2Dstyle%2Dfor%2Dmathematicians
I'm interested in learning about the details of English grammar and usage, and also maybe in picking up some prescriptions or guidelines for writing well-styled/balanced prose (a la Strunk & White, though my understanding is that there's potentially a great many schools of thought to look at here). The kicker: my academic background is in math and computer science, including the very formal reaches of things like logic, formal languages, etc. Is there any way that this stuff can help me learn that stuff? In particular, is there any especially elegant/systematic/diagrammatic/intuitive way to learn about English grammar and style past what got drilled and memorized at the elementary school level? Book recommendations especially welcome.tag:ask.metafilter.com,2014:site.268686Thu, 18 Sep 2014 14:36:49 -0800karoHelp me be a better tutor!
http://ask.metafilter.com/268521/Help%2Dme%2Dbe%2Da%2Dbetter%2Dtutor
I'm helping elementary school kids with their math and English homework. I really need math resources and strategies for helping kids with their reading/writing homework. Some are English language learners. 1) I worked with a second grader, a fourth grader, and two fifth graders last week. The kids I worked with were doing subtraction (second grade), and basic algebra (fifth grade). I want to be a helpful tutor. What math topics and resources would be the most useful for me to review?<br>
2) What are some strategies I can use when I'm going through critical reading or writing assignments with kids who struggle with reading and/or English vocabulary?<br>
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If you have any other suggestions (they don't have to be related to those two), I'm all ears. The organization I'm tutoring with gave out a handbook with tips (a.k.a. "Use the Socratic method! Check for understanding! Don't just give them the answer!"), and I'm looking to get beyond that. I'm the least experienced tutor, and it shows.<br>
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Thanks!tag:ask.metafilter.com,2014:site.268521Mon, 15 Sep 2014 13:26:35 -0800topoisomeraseHelp me model some curves that have a certain time profile.
http://ask.metafilter.com/268176/Help%2Dme%2Dmodel%2Dsome%2Dcurves%2Dthat%2Dhave%2Da%2Dcertain%2Dtime%2Dprofile
I've got a bunch of curves that (I hope) show some common profile over time, although they maybe scaled versions of each other: at any index along in the curve >1, the next point is conditional on all (or some) of the previous.
See <a href="http://i60.tinypic.com/2yklu21.png">this greatly simplified example</a>. The units on the X axis are just time increments after the first observation, like n+1,n+2. So we can't use the X axis values to train. That is, the first point in the curve could come at X=1 or X=100. But its units are consistent between curves. Anyway, each curve is just a 1-d list of single real numbers.<br>
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Anyway, I need to train some model by feeding it these training curves and telling it which point is "Go!". Then I want to feed in new, unseen lines, one value at a time, and have the model say "Ready?" when "Go!" is <em>going to be the next point</em>.<br>
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It sounds like <a href="http://en.wikipedia.org/wiki/Posterior_predictive_distribution">Posterior predictive distribution</a> does something like this, but I don't have time to research it now. I have 24 hours. Really I need a library (like Sci kit learn) to just fit to the training values, take some test values and say if "Go!" will be next or not. Can someone advise on what I need?tag:ask.metafilter.com,2014:site.268176Tue, 09 Sep 2014 07:39:17 -0800ed\26h2 year old son loves numbers - how can I nurture his talent?
http://ask.metafilter.com/268037/2%2Dyear%2Dold%2Dson%2Dloves%2Dnumbers%2Dhow%2Dcan%2DI%2Dnurture%2Dhis%2Dtalent
My 2 year old son <em>loves</em> numbers. He can count by himself well into the 50s and can tell you what number he's looking at to at least as high as 110. As for me, well, numbers and I have never been the best of friends. How can I, a numbers-adverse dad, encourage and nurture his talent? My son is only 2 years old (he turns 3 in November) and loves numbers a lot. He can count unassisted into the 50 (he could probably go higher but I think he gets distracted). On top of that, you can show him a number as high as at least 110 and he'll tell you what number that is.<br>
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Lately he's been taking wooden numbers from a puzzle he has and been combining individual numbers to make other numbers (for example, adding a 6 and an 8 and saying 68, or a 10 and a 3 and saying "one hundred three"). I'm super-impressed. <br>
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I'm going to avoid the proud dad cliche by stopping short of saying he's gifted, but I do think he has a talent for numbers that I think should be nurtured.<br>
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I'm not great with numbers, though. I can do enough math to get by in daily life, but I've always been more of a "words" guy. Any suggestions you might have for me to help me nurture his talent and love of numbers?tag:ask.metafilter.com,2014:site.268037Sat, 06 Sep 2014 16:13:21 -0800Effigy2000Help with 2D transforms in ellipse drawing algorithm
http://ask.metafilter.com/267708/Help%2Dwith%2D2D%2Dtransforms%2Din%2Dellipse%2Ddrawing%2Dalgorithm
I'm trying to draw a 3D ellipse with a 2.5D graphics engine (Core Animation layers) which allow me to only compose my ellipse with line segments that must be moved into place using rotations and translations. I'm having trouble with the order of operations and can't get it to draw properly. Any graphics gurus or game programmers out there who can help me? <a href="https://dl.dropboxusercontent.com/u/1790795/ellipse.png">Here's an image</a> describing my current approach.<br>
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For each segment in the ellipse polygon, I'm first creating a line segment with the correct length, then translating it to the point P1, then rotating the point by the PI/2-theta, but this is clearly not working.<br>
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It's been 10 years since I took a graphics class in university, can someone please jog my memory as to what I'm doing wrong?tag:ask.metafilter.com,2014:site.267708Mon, 01 Sep 2014 11:02:19 -0800krunkHow do you compare profits to loss due to inflation?
http://ask.metafilter.com/267164/How%2Ddo%2Dyou%2Dcompare%2Dprofits%2Dto%2Dloss%2Ddue%2Dto%2Dinflation
I'm trying to compare the compounded losses due to inflation to non-compounded profits. E.g. if inflation makes me lose 3% of an investment each year, what % would I need to profit each year in order to exactly keep up? This is tricky because the profit is not compounded the way inflation is. I'm not looking for an answer to this specific question, but rather, looking for a tool or method to do this kind of math. Ok, that's convoluted, so here's an example. <br>
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Say I can spend $100 to build a machine that prints $3 per year. In other words, it returns 3% of the initial investment each year. <br>
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Assuming inflation stays at 3%, how do I compare profits to inflation loss? Initially I thought that 3% gain would match up exactly with inflation each year, since your money would lose $3 of value (due to inflation) but you'd print $3.<br>
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But then I realized you'd lose less than $3 of value after the first year, since the inflation works on money that's already lost value. In other words, it compounds, so you would lose a little less than $3 of value the second year, and even less the next year. So then I figured that printing the $3 would put you above inflation.<br>
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But then I realize that the $3 you print is subject to inflation as well. It loses $0.03 of value, so you're not adding $3 per year, you're adding $2.91, which means the first year your value would go down from $100 to $99.91. So then I thought that you would be doing worse than inflation.<br>
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The more I think of this, the more confused I get. How do I do this math??<br>
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Obviously, this isn't a realistic scenario. A more real scenario, I'd be selling something, and the sale price would go up as inflation went up, so it would be easier to match inflation. But I can't even figure this out in a vacuum, I don't know how I'm going to figure it out with the added complexity of being realistic.tag:ask.metafilter.com,2014:site.267164Thu, 21 Aug 2014 11:20:25 -0800brentonStatistics Book for an interested teen
http://ask.metafilter.com/266881/Statistics%2DBook%2Dfor%2Dan%2Dinterested%2Dteen
My teen aged niece has suddenly found a strong interest in statistics. What book would you recommend for a 14 year old who has good, but not advanced, math skills?tag:ask.metafilter.com,2014:site.266881Fri, 15 Aug 2014 10:57:43 -0800honestcoyoteHelp! Can I normalize statistical coefficients?
http://ask.metafilter.com/266739/Help%2DCan%2DI%2Dnormalize%2Dstatistical%2Dcoefficients
With deadline looming, stats consultant has bailed. Simple queries need resolution. Help?
I am working on a data graphic that involves statistical calculations about survival rates for startup businesses, correlated with certain tangible and intangible factors. The raw data (about survival/closure/merger outcomes) has already been investigated, and the original researchers (who are awesome) have generated some interesting correlations using univariate regressions and Cox regressions. For my output I am relying on their statistically significant findings, wanting to create comparisons among the univariate coefficients. Not sure my methods are kosher and would appreciate consultation. Avalanche inside. To make the information clearer to a lay audience, editors and I want to present the figures in a comparative framing. Ideally, we're aiming to say "firms with factor [foo] have a XX% greater likelihood of survival than firms with factor [not-foo1] and a YY% greater likelihood of survival than firms with factor [not-foo2]." <br>
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Univariate: <br>
The factors are characteristics of the owner and/or firm that survives/closes/merges. Specifically, I have univariate coefficients for owner age (binned categorical), race (categorical) owner years of experience (continuous), owner's experience in same industry (dummy: yes/no), owner's college degree (dummy: yes/no), firm diversification (dummy: yes/no), possession of IP (dummy: yes/no), and startup capital (binned categorical). I have firms categorized as high-, medium- and non-tech.<br>
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What I am hoping to do is normalize the coefficients. Simple example:<br>
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female-owned: survive 8.5 close 17.81 merger or sale 12.09<br>
male-owned: survive 91.5 close 82.19 merger or sale 87.91 <br>
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(If it matters, t-test was used to determine statistical significance; all of the above are stat-sig.)<br>
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Can I say that female-owned businesses in this category are more than twice as likely to close as they are to survive [(17.81/8.5) = 209%]? And, similarly, 42.2% [(12.09 - 8.5)/8.5] more likely to merge or be sold than to survive?<br>
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If I calculate similarly for male-owned businesses (89.8% as likely to close as to survive), can I compare the 209%-as-likely women's closure likelihood to the 89.8%-as-likely men's closure likelihood? <br>
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And does the 89.8% comparative likelihood of closure mean that men's firms are actually 11% more likely to survive? Or do I need to use a different denominator in calculating that?)<br>
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Cox - competing risks: <br>
With Cox regression tables, the researchers calculated the comparative likelihood of competing risks (closure vs. M&A -- both are considered business exits). <br>
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It seems clear that these figures are meant to be compared in pairs - closure vs. M&A. As I understand it, the coefficients represent positive/negative correlation (with each type of exit) and the absolute value (intensity) of the influence...? <br>
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For example: <br>
Duration regression analysis - Cox regression (competing risks)<br>
White-owned high-tech firms:<br>
closure 0.56/m&a 0.45<br>
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White-owned medium-tech firms:<br>
closure 0.69/m&a 0.8<br>
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White-owned non-tech firms:<br>
closure 0.67/m&a 0.64<br>
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I suppose I can compare the closure figures to one another, but how? The scale is not necessarily -1 to 1, as some of these coefficients are upwards of 3 (for factors other than race, such as whether the business is a franchise). <br>
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And given this type of info, can any information about survival likelihoods possibly be derived (via...umm...subtraction or something)? <br>
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I feel a bit sheepish about these simple-minded queries, but for that reason I was sure they would be no-brainers for someone here. Sincere thanks to anyone who can shed some light.tag:ask.metafilter.com,2014:site.266739Wed, 13 Aug 2014 08:13:31 -0800GrammarMosesMath-related field trip destinations for Bay Area HS students?
http://ask.metafilter.com/266716/Math%2Drelated%2Dfield%2Dtrip%2Ddestinations%2Dfor%2DBay%2DArea%2DHS%2Dstudents
I teach math to high schoolers in the San Francisco Bay Area. I'd like to get them out of the classroom on a field trip to a local math-themed destination. Any suggestions? The destination doesn't need to be as completely all-about-math as the Museum of Math in NYC (though I would totally take them to the Museum of Math if it were nearby). Any place that can be tied in to a meaningful (and fun!) math lesson is fine. I'd rather it not be a theme park, though.<br>
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The students would be from math club and advanced classes (precalculus and up), so most are pretty sophisticated and enjoy math to begin with. It would be great to tie the trip in with something off the beaten path, curriculum-wise -- like if we could teleport to the Alhambra and try to <a href="http://britton.disted.camosun.bc.ca/alhambra/">spot as many symmetry groups as possible</a>. But we can't teleport to the Alhambra.tag:ask.metafilter.com,2014:site.266716Tue, 12 Aug 2014 18:36:31 -0800aws17576Methods of approximation?
http://ask.metafilter.com/266688/Methods%2Dof%2Dapproximation
I've never been very good at either math or at eyeballing things like weight or dimension, but was thinking recently about how to more or less accurately weigh things without using a scale. What good methods are out there to approximate other kinds of measurements? For weight, I figured the easiest way is to start with a known weight that can be easily divided (say a bag of sand), and that's heavier than what you're weighing. Compare it with what you want to measure. If it feels too heavy, divide it in half, set one half aside, and compare that. If it's too light, split the other half, set part aside, add that to your reference weight, and so on.<br>
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I realize this is super basic stuff that was figured out a long time ago and is in some sense just using your hands as a scale, but it seems interesting how precise you could be as long as you were it accurately and knew how heavy the reference was to start. Also, the fractions you end up with at the end are easy to add up since they all have powers of two at the bottom. Is there a name for this kind of thing (continually splitting in half and adding back the fractional parts to get closer to what you want)? And is there a more generalized technique here that applies easily to estimating other kinds of things?tag:ask.metafilter.com,2014:site.266688Tue, 12 Aug 2014 09:34:45 -0800OverlappingElvisWhich algorithms changed the world?
http://ask.metafilter.com/266586/Which%2Dalgorithms%2Dchanged%2Dthe%2Dworld
A recent post to the blue proposed a set of <a href="http://www.metafilter.com/141814/Math-and-equations-are-fun">equations that changed the word</a>. As a computer professional, I'm curious, which algorithms transformed the world? I'm not necessarily looking for 'algorithms a computer programmer should know' or 'algorithms we should teach in CS 101.' An algorithm impact on the world should be the primary criteria, rather than pracitioner familiarity or pedagogical use.tag:ask.metafilter.com,2014:site.266586Sun, 10 Aug 2014 14:50:48 -0800pwnguinMath Camp for Economist help!
http://ask.metafilter.com/266560/Math%2DCamp%2Dfor%2DEconomist%2Dhelp
I'm basically teaching myself how to do pass an PhD economics placement test, and I'm looking for resources to learn these things that aren't books. I have A LOT of books, including the math camp notes for my school which I am currently unable to attend. But I'm looking for either video collections or forums to discuss these things and ask questions. We're using the book, Further Mathematics for Economic Analysis and I find it really useful. (I'm in a related social science program and looking to take econ classes down the line).<br>
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I need to know how to do basic real analysis proofs, log-linearize some functions, tell if a formula is homogenous, homothetic, etc. Thanks!tag:ask.metafilter.com,2014:site.266560Sun, 10 Aug 2014 07:56:31 -0800MisantropicPainforestWhat are inter-disciplinary and atypical uses for math MSc?
http://ask.metafilter.com/265859/What%2Dare%2Dinter%2Ddisciplinary%2Dand%2Datypical%2Duses%2Dfor%2Dmath%2DMSc
I have just completed my MSc in mathematics in Europe. I do enjoy math, but I spent my uni years feeling like a autodidact hippie marooned on an island full of Mr and Mrs I-Want-A-Good-Job. My main interests revolve around humanities (literature/history/anthropology) and economics (but not finance), and instead of starting a "stable" well-paying career I dream about something inter-disciplinary. I am very open to earning little money and relocating just to do kind of work that engages those skills. What are some random uses of my degree? <strong>While I know that this might be kind of "have your cake and eat it too" scenario, I dream about utilising my core technical skills in an environment which doesn't stifle my humanistic interests but rather sees them as strengths.</strong> I am very open to studying more, but PhD programs that I find don't really cater to mathematicians who don't want to do pure math anymore. While this is very hopeful, math+analytic skills+statistics+coding are in-demand skills these days, so there must be opportunities there.<br>
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- I am mid-twenties. <strong>I am located in Europe</strong> (studied in Poland and Germany). I have no ties and can go anywhere, but highly US-specific info doesn't apply.<br>
- I saved money and <strong>only need to earn for basic living needs</strong>, which are low.<br>
- I am <strong>open to working short-term</strong>, half-time, trying as many new things as possible, <strong>travelling a lot to random places</strong>.<br>
- I did most of my studying on probability/statistics and graph theory. I loved game theory. I learn fast.<br>
- I have working experience in healthcare assessment (statistics) and I code (also in R and for web). It was pleasant, might do that some more, but I'd happily try something different.<br>
- I am useless at googling things, my ability to search for jobs/opportunities is non-existent and I'm haplessly clueless about all this "selling yourself" business.<br>
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<strong>So, in a nutshell: random, low-paying, humanities and soft/life sciences, uni work, weird places, inter-disciplinary PhDs (?).</strong><br>
Not my cup of tea: marketing, business, actuarial science, engineering, pure programming, big companies.<br>
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As a very dim example, I loved reading about Cliodynamics (historical modelling). My main inspirations (intellectually) are Jacob Bronowski and Douglas Hofstaedter. I adore Tyler Cowen's Marginal Revolution.<br>
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I realise this is a long shot, but it can't harm to ask and google around. You are welcome to be as random as you want.tag:ask.metafilter.com,2014:site.265859Mon, 28 Jul 2014 05:02:34 -0800desultory_banyan4x+y+2z=100, x>y, y>z, x+y+z=j, 3x+z=k, j>k, j+k=100.
http://ask.metafilter.com/265560/4xy2z100%2Dxy%2Dyz%2Dxyzj%2D3xzk%2Djk%2Djk100
4x+y+2z=100, x>y, y>z, x+y+z=j, 3x+z=k, j>k, j+k=100. WolframAlpha can only give me alternative forms or a solution involving 'real and imaginary parts of z'. Is there a solution I can count on my fingers? I wish to buy a thing. The thing I buy will have two desirable characteristics: j, and k.<br>
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j comprises three sub-characteristics, while k comprises four sub-characteristics.<br>
<br>
I have three levels for ranking how important these sub-characteristics are to me - let's say 'super important', 'kinda important' and 'meh, whatever'. Obviously, they are of decreasing importance.<br>
<br>
I have rated the three sub-characteristics for j 'super important', 'kinda important' and 'meh, whatever'.<br>
<br>
I have rated three of the four sub-characteristics for k 'super important', and the fourth 'meh, whatever'.<br>
<br>
This means I have a total of four 'super important', one 'important', and two 'meh, whatevers'.<br>
<br>
Finally, j is a little bit more important to me than k. If further defining these variables help, then I think they'd be about a 60/40 split, though I'm flexible. They can be equal if that helps. At this stage I'd settle for k being less than j if it means a solution pops out.<br>
<br>
I would like to assign positive numbers to x, y and z, because I'm a bureaucrat, that's why.<br>
<br>
So, <br>
<br>
x>y (must)<br>
y>z (must)<br>
<br>
j = x + y + z<br>
k = 3x + z<br>
4x + y + z = 100 (per cent)<br>
j + k = 100 (per cent)<br>
<br>
I can't change the number of characteristics, sub-characteristics, or levels of importance. <br>
<br>
I could make k=2x+y+z, and so change the overall equation to 3x+2y+2z, but I'm not smart enough to know if that helps. It didn't help WolframAlpha.</j>tag:ask.metafilter.com,2014:site.265560Tue, 22 Jul 2014 18:07:45 -0800obiwanwasabiMath Careers
http://ask.metafilter.com/265554/Math%2DCareers
Non-obvious careers for someone with a B.S. in Applied Mathematics? I just graduated with an Applied Mathematics major and Computer Science minor, and I need a job ASAP. The thing is, I didn't think too much about what I was going to do when I finished school. All the career advice I've seen for people with my degree falls in only a couple different categories, most of which aren't really good options for me. I'm in need of some original suggestions for places I should be looking.<br>
<br>
Things I DON'T want to hear: <br>
<br>
+Grad school.<br>
+Actuarial Science.<br>
+Vague titles like "Mathematical Analyst." Which industries? What keywords can I search for?<br>
+Programming, unless you have tips on how to bridge the gap between the small projects I did in school and real-world development, or how to get hired with no experience. (Or you can reassuringly convince me that it's really not that hard.)<br>
<br>
It's not necessarily that these are unappealing; I'm already aware of them, just looking for alternatives.<br>
<br>
Is there anything I'm overlooking?tag:ask.metafilter.com,2014:site.265554Tue, 22 Jul 2014 15:28:13 -0800AnonymousMath? College?
http://ask.metafilter.com/265440/Math%2DCollege
The best way to pursue my college goals given my situation. Last summer I went back to college and I took an Algebra and then A Pre-Calc course. I did well enough, A's in both. I never felt like I was really making any connections though. I started a career and as a result stopped pursuing school. I would now like to continue attending school on the side. I want to pursue more math and science courses but am not sure if it is a bad idea to try to take a Calc 1 class given the gap from the previous math courses last year. I am all for learning on my own, and am with several subjects, but math just does not seem like the kind of topic I can jump right into on my own and make any significant headway. Any suggestions on specific resources to get me up to speed or thoughts on what would be best in this case? I never really tried at the math and sciences when I was growing up and only gave it a shot for the first time last summer so I am not drawing on a significant base of knowledge. Thanks, I appreciate it.tag:ask.metafilter.com,2014:site.265440Sun, 20 Jul 2014 17:38:16 -0800mrdrummedCalculus Rabbit?
http://ask.metafilter.com/265439/Calculus%2DRabbit
Is there a game like <a href="http://www.mobygames.com/game/math-rabbit">Math Rabbit</a> out there, but for calculus? Specifically looking for something with lots of game-interface, not Khan Academy.tag:ask.metafilter.com,2014:site.265439Sun, 20 Jul 2014 16:41:00 -0800curious nuwhat percent will result from combining two types of milk?
http://ask.metafilter.com/265223/what%2Dpercent%2Dwill%2Dresult%2Dfrom%2Dcombining%2Dtwo%2Dtypes%2Dof%2Dmilk
If I add 1/100 to 2/100, I get 3/100 or 3%. But if I add one hundred apples, one of which is red, to one hundred apples, two of which are red, I will have 3/200 or 1.5%. I'm very confused now as to what percent milk fat my milk will be if I combine the two types of milk (1% and 2%) together.tag:ask.metafilter.com,2014:site.265223Wed, 16 Jul 2014 09:49:50 -0800windykites