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You Can't Handle the (Next) Proof!

Working through Apostol's Calculus Volume I for personal development. Stuck on a proof, again. Can you help? [more inside]
posted by bfranklin on Mar 18, 2014 - 6 answers


How to take scientific notes efficiently?

What is the best way to take grad level notes that feature tons of text, math equations and diagrams, during class, while reading books, and while reading research? Ability to search and organize a huge plus! Digital or non-digital solutions considered. [more inside]
posted by Riton on Mar 18, 2014 - 13 answers

Singapore Math

I'm trying to help my 3rd grader with his math homework, but we are stuck on one problem. I can solve it using Algebra, but I'm trying to figure out how to explain it to him using the Singapore method that he's taught in school. Note that he hasn't learned how to add negative numbers, which puts a crimp on the methodology. [more inside]
posted by agog on Jan 27, 2014 - 7 answers

You Can't Handle the Proof!

Working through Apostol's Calculus Volume I for personal development. Stuck on a proof. Can you help? [more inside]
posted by bfranklin on Jan 25, 2014 - 7 answers

Why can't I differentiate this nomal/Guassian distrubution?

Have a look here. I'm assured that differentiating 1, with respect to x, gets you 2. Now 2 is - I think, and correct me if I'm wrong - equivalent to 3. The problem is I can't see how 3 is the result of differentiating 1. What's more, an online solver produces something (that looks) very different. Can someone help me out?
posted by ed\26h on Jan 17, 2014 - 9 answers

Percentage Question

Help me understand percentages. [more inside]
posted by dbirchum on Dec 31, 2013 - 17 answers

I need to be able to memorize several formulas for a test next week

I'm taking a numerical methods class and there are all these discretization schemes of partial differential equations named after pairs of dudes and they all are kinda the same, maybe a bit different in indexes.... I'm trying to organize it all in my head, like a frat house, with the dudes that worked on the same scheme being roommates, but it seems to be taking a long time to actually "find" a place for each scheme in their "rooms" and keeping it there in a sort of visual arrangement. Test is no books no notes, and everything kinda of just jumbles inside my head right now.
posted by spacefire on Dec 11, 2013 - 10 answers

Studying the masters, not their pupils (budget edition)

I am a frequent buyer of <$5 books on Amazon. Lately I am interested in math treatises but have been unable to find any that aren't way out of my price range. Am I being way too demanding? [more inside]
posted by myitkyina on Oct 20, 2013 - 9 answers

Math game that featured Bach and Mozart

Around 1995 I played a game on the Mac in school that was for educational purposes, supposedly for the purposes of drilling math skills, and had Mozart Symphony no. 40 (1st movement and but I think 3rd as well), Bach BWV 999, and possibly some Paganini as well, as background music. Do you know what it was?
posted by Busoni on Oct 10, 2013 - 4 answers

I want to show a movie clip in a public talk. Is this legal?

I'm giving a public talk about Goldbach's Conjecture. There is a crazy Spanish movie in which a character is famous for having proved the conjecture. Can I show a clip or two from this movie in my public talk? The talk will be in a bar, and there's a $5 suggested donation, so I don't know if that counts as charging people (if that affects the legality of my idea). Thanks!
posted by middlethird on Sep 26, 2013 - 8 answers

Modern Zoombinis?

What is the modern equivalent of 1995's lovely LOGICAL JOURNEY OF THE ZOOMBINIS computer games? They taught math logic skills rather neatly for children, but I don't have a computer that will run the old games.
posted by musofire on Sep 25, 2013 - 4 answers

Tools For the Spatially Challenged: Couch-Movers Edition

Wizards of Hive, Before I buy that 90" couch from a friend, how can I make sure I'll be able to get it up my L-shaped stairs? Sure, there are a lot of variables. But is there a tool or methodology for figuring this out ahead of time (presuming I know the depth and height of the couch too)? I don't think I have the cardboard to build a mockup. This couch is 50 miles away and can't be returned. Thanks!
posted by baseballpajamas on Aug 21, 2013 - 14 answers

Math Puzzles, Please!

"Math for Smarty Pants" was awesome -- recommend me more books like that for a kid who loves math puzzles. [more inside]
posted by selfmedicating on Aug 7, 2013 - 9 answers

I want to be able to read CS and math research papers with ease.

I often find myself crossing interdisciplinary lines and reading research papers, trying to understand some new practice or algorithm in math or computer science. I start out thinking "I just need to understand these basic concepts and I'll crack this", but end up with a very tired brain at 5am, having tried to mainline dense trees of Wikipedia and Eric Weisstein'sWolfram MathWorld, and still not feeling like I retained everything. [more inside]
posted by hanoixan on Aug 1, 2013 - 9 answers

Rearranging the formula for Compound Annual Growth Rate

How do you rejig the formula for CAGR to get the starting value when you know the other variables? [more inside]
posted by MuffinMan on Aug 1, 2013 - 3 answers

Where can I find sample arithmetic problems like this one!

I'm taking a standardized test on Wednesday with the Government of Canada and they ask individuals four types of questions. The type that I struggle with are the arithmetic problems... specifically determining the formulas to solve word problems. I was hoping someone might be able to point me in the direction of a website or easily accessible textbook to practice today and tomorrow before the test. [more inside]
posted by DorothySmith on Jul 15, 2013 - 11 answers

I was banned from collegeconfidential just for asking for some help?

Summer vacations are coming up and I am going to use some of my free time to learn physics and math, subjects that I love. In order to do that i asked collegeconfidential.com if anyone had "exclusive study materials" from their university which they could share. I mentioned that I would like to have acess to tests and exams from other universities and I could give some good materials collected by my colleagues of the physics and math course in exchange. [more inside]
posted by tsuwal on Jul 12, 2013 - 27 answers

Textbook Cross-reference for different editions

Is there some place I can find cross-reference guides to match up material and problem sets between different editions of the same textbook (specifically math textbooks) ? [more inside]
posted by marsha56 on Jun 29, 2013 - 4 answers

I would rather throw a tantrum than learn math (10 year old edition)

I tutor a boy who is moving from 4th-5th grade. He's at grade level in most subjects, above grade level in reading, but getting an Elvis Presley head in math. Can you help me find ways to help him be less intimidated by math, allowing us more time to learn and practice before his eventual mental shutdown each session? [more inside]
posted by ovenmitt on Jun 9, 2013 - 13 answers

150 to around 120, which bpm is best for pitch?

I have a song at 150 bpm, perfectly in tune. I want to repitch it down to around 120 by slowing it down. At which bpms will the notes be at pitch?
posted by semaphore on May 23, 2013 - 6 answers

How to pronounce an equation in English.

Please help me pronounce this formula related to projectile motion as it would be spoken out loud: L = v0^2 sin2θ / g [more inside]
posted by misozaki on Apr 30, 2013 - 15 answers

Algebra: exotic identity values?

[mathfilter] please give me some example algebraic structures that are not commutative, with exotic identity values. [more inside]
posted by knz on Apr 8, 2013 - 5 answers

Masters in maths? Difficulty level: Have bachelors in graphic design

Dear Mefites, a long time ago I got a degree in graphic design but never worked in the industry. Along the way I somehow (don't remember how or why or when) became interested in math and I finished a graduate diploma in maths as a distance learning course in my free time. I am considering applying for masters programmes in maths or related subjects but ... can I? Should I? [more inside]
posted by Cat Set Go on Mar 31, 2013 - 10 answers

Wearable expressions

What is the math (physics?) going on in this very cool-looking, equations-as-art necklace?
posted by firstbest on Mar 28, 2013 - 10 answers

Basic math test as part of a job application?

Which employers still use a basic math test as part of the application process? [more inside]
posted by klausman on Mar 9, 2013 - 15 answers

Can a transcendental number raised to an algebraic power be algebraic?

Can a transcendental number such as pi, be raised to an irrational, but algebraic power resulting in an algebraic solution? Complex solutions would be acceptable. There might be a quick proof here, or there might not be. - Thanks for any help you can offer answering this! (And I promise that this isn't for a class or anything like that!)
posted by ch3cooh on Mar 2, 2013 - 3 answers

Fiction help: Name something a math genius could do to improve a bar.

Writing a script, need a few believable, throwaway lines for a character. A guy running a TGI.Friday's-like bar praises his bartender, a math genius, for giving him an idea that saves money and improves the business overall. An example of outside-of-the-box thinking that enforces that our math-genius-in-disguise really is a genius. Bonus points if the idea skirts the line of legality -- something funky with accounting, maybe? [more inside]
posted by Cool Papa Bell on Feb 9, 2013 - 22 answers

The Seven Bridges of Königsberg in 200 Words or Less

Can you recommend short, easy-to-understand math writing I can read before bed? [more inside]
posted by kristi on Jan 29, 2013 - 12 answers

What does a mathematician do all day?

I'm wondering, after breakfast, and a shower, and a commute, and coffee - what is next? [more inside]
posted by Lownotes on Jan 24, 2013 - 23 answers

How do I figure out how to divvy out these projects?

I have roughly 20 people who each need a project. I have 27 projects and don't want anyone to share a project. I let the people pick their top five projects and rank them so I know who wants what. What is the best (easiest...) way for me to fairly figure out who should get what project so that the most people get their top choice, or at least one of their top choices? [more inside]
posted by pwb503 on Jan 22, 2013 - 8 answers

Perspective drawing calculation

If I want to draw something in one-point perspective, say, like a set of railroad tracks where the vanishing point is on the horizon, and the tracks are represented on the picture plane by an equilateral triangle (they appear that way to the viewer), the apex of the triangle being the vanishing point on the horizon and the base of the triangle is where the tracks meet the picture plane, how do I calculate where the railroad ties would be? (Given that in 3D they are evenly spaced. Also, I'm not really concerned with the thickness of the ties -- we can consider the ties to simply be horizontal lines.) [more inside]
posted by strangeguitars on Jan 8, 2013 - 5 answers

centering circular cake boards

[geometryfilter] I have to assemble a tiered cake stand to hold cupcakes at a wedding tomorrow. The tiers and the styrofoam thingies that will separate the tiers are all circular. How do I make sure that I get each tier centered properly on the next?
posted by undue influence on Dec 13, 2012 - 5 answers

What does a professional statistician do?

(Good) jobs involving probability and statistics other than math teacher or actuary? [more inside]
posted by CustooFintel on Dec 3, 2012 - 15 answers

I'm not stupid, I'm just American!

I need to learn how to seamlessly convert between miles and kilometers in my head - without having to think about it. [more inside]
posted by matty on Nov 16, 2012 - 25 answers

Mortgage Math Problem

Please teach me how to solve this problem related to a Home Equity Line Of Credit. While I am looking for an answer, I am equally interested in learning the math required to solve the problem. [more inside]
posted by The Architect on Nov 9, 2012 - 4 answers

Percentage Calculation

I know the price of something now and what the price was 2 years ago - how do I calculate that as an annual percentage increase? [more inside]
posted by jontyjago on Oct 19, 2012 - 12 answers

What is the cardinality of the set of all people who shall expel us from the paradise that Cantor has created?

Sweet descriptions of the empty set? [more inside]
posted by King Bee on Oct 12, 2012 - 12 answers

Take a math course to overcome math fear?

Math is sexy! But I am afraid of math. What class should I take to overcome my fear and get cozy with numbers? [more inside]
posted by epanalepsis on Oct 1, 2012 - 28 answers

Help me help my brain learn how to scale up and down with precision in Adobe Illustrator.

If I scaled the artwork up by typing 173.95% into the scale dialog box in Adobe Illustrator, what percentage do I scale it down by in order to get it back to its original size. Is there a simple equation that will do this operation? [more inside]
posted by OlivesAndTurkishCoffee on Oct 1, 2012 - 9 answers

Can somebody help me track down the source claiming Leonid Kantorovich was responsible for safety on the Road of Life during the Siege of Leningrad?

Can somebody help me track down the source claiming Leonid Kantorovich was responsible for the safety of evacuees on the Road of Life during the Siege of Leningrad? [more inside]
posted by onalark on Sep 29, 2012 - 7 answers

Expanding my pure math knowledge?

Can anyone recommend some advanced (pure) math books to learn new subjects? Also nonfiction books about math that are good reads? [more inside]
posted by DynamiteToast on Sep 21, 2012 - 23 answers

What are the odds?

Math/probability not sports: I am not a gambler, but I am trying out a method of betting on sports with some initial success. At what point can I use the numbers to confidently assume that this is down to the system rather than luck? [more inside]
posted by cincinnatus c on Sep 19, 2012 - 4 answers

Numbers Rackets and Benford's Law

Does Benford's Law apply to Numbers Games? [more inside]
posted by Tell Me No Lies on Sep 16, 2012 - 10 answers

I'm bad at math.

I already know where to place my router. My question is, how do I find the exact center of my house? [more inside]
posted by PapaLobo on Sep 12, 2012 - 8 answers

x + y = A in pre-calc. Help me solve for x and y!

What do I need to know to be ready for pre-calculus? [more inside]
posted by sacrifix on Aug 25, 2012 - 16 answers

The Limits of Flatness

Are there an infinite number of 2D shapes? [more inside]
posted by mwachs on Jul 19, 2012 - 17 answers

Mac friendly computer software to draw math pictures.

Anyone know of a Mac friendly computer program that makes it easy to draw geometric figures? Preferably free, but I'm willing to pay if its not too much and if its worth it. [more inside]
posted by junipero on Jul 17, 2012 - 19 answers

Getting my math(s) right.

Maths (math) people of the US: I need your help in working out if certain British conventions would be understood or standard in the US classroom. [more inside]
posted by cincinnatus c on Jul 10, 2012 - 15 answers

How to Find The Average Commenter?

Harmonic or Arithmetic Mean?: I'm trying to settle an argument with my wife - is using the arithmetic mean or harmonic mean more appropriate when finding the "average" number of, say, online comments made by a large number of people, where a significant portion of them make only one comment and a few people make the bulk of the comments? [more inside]
posted by salsamander on Jun 2, 2012 - 13 answers

Making the impossible possible

Help with a simultaneously math & non-math question: Finding the square root of a negative number was impossible until imaginary numbers came along. What are examples of other things that were impossible until we altered systems that have been created? [more inside]
posted by CaptainCaseous on May 24, 2012 - 22 answers

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