## Poul la Cour?

Can anyone point me towards a good resource for learning more about Poul la Cour's work on wind turbines? Or other historic wind turbine work?
posted by teraspawn on Nov 13, 2012 - 3 answers

## What should my sample size be?

Say that I have a bag which contains 100 balls and every ball in the bag should be red, but it's possible that one or more of these balls is the wrong colour. How many balls should I look at to be 90% sure that all the balls are red? Or 95%? Or 99.9%? Talk me through how to work this out, please?
posted by xchmp on Nov 12, 2012 - 14 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.
posted by The Architect on Nov 9, 2012 - 4 answers

## Practice Probability Word Problems

What great books or resources are there for practicing probability word problems such as for standardized tests like the GRE?
posted by Mr. Papagiorgio on Nov 8, 2012 - 3 answers

## Direct line to Stephen Hawking

Where can I find someone willing to help me do relatively simple (ha!) relativistic time dilation calculations?
posted by brenton on Nov 2, 2012 - 14 answers

## What are the odds that two randomly selected people share the same bank PIN?

Statisticsfilter: Given available information about the distribution of self-selected 4-digit passwords (specifically banking PINs), is it possible to calculate the probability of two randomly selected individuals having the same PIN? If so, what're the odds?
posted by myrrh on Oct 27, 2012 - 15 answers

## Building website for math students, first-time programmer, need some guidance.

Building website for math students, first-time programmer, need guidance.
posted by brighteyes7 on Oct 22, 2012 - 7 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?
posted by jontyjago on Oct 19, 2012 - 12 answers

## Two roads diverged in a yellow wood... and I took the one where I went crazy for a month to raise my score 40 points... and that uh... has made all the difference?

GRE-Filter: I was happy with my GRE scores. Then, I received word that I have the opportunity to get into a super-duper-top-tier doctoral program previously inaccessible. However, my Quantitative Score--while still in the range of accepted scores over the years for this program--is now less-than-stellar relatively speaking. Is it crazy to think I could study intensely for about a month and improve my score 30-50 points? Am I overthinking this?
posted by anonymous on Oct 15, 2012 - 12 answers

## Help me figure out what in the world I should do with my life.

Should I change my major? Drop out of school to become a plumber or electrician? I need some advice.
posted by bookman117 on Oct 14, 2012 - 31 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?
posted by King Bee on Oct 12, 2012 - 12 answers

## Typeset my equations--as vector graphics

I am trying to create math worksheets in Adobe Illustrator. I would like to not manually build the equation layout. Is there a math typesetting program (like LaTeX) that creates vector graphics I can plug directly into AI? Free/stupidly easy to use/OS X compatible are the key requirements.
posted by philosophygeek on Oct 5, 2012 - 4 answers

## How fat DOES a man have to be to stop a runaway trolley?

How fat DOES a man have to be to stop a runaway trolley? Check my math/physics please.
posted by RobotHero on Oct 4, 2012 - 10 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?
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?
posted by OlivesAndTurkishCoffee on Oct 1, 2012 - 9 answers

## what sort of maths do the aliens have?

Are some areas of maths inherently central and others as more peripheral? Or is any sense of centrality just a human experience, a cultural artifact arising from: what has had greater application, what has been studied more, what produces a greater sense of the sublime in the human mind? Are some parts of mathematics inherently a more fundamental description of what is going on in the universe, or is it as silly (or correct?) to talk about maths that way as it would be to talk that way about a classical ballet?
posted by compound eye on Sep 30, 2012 - 6 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?
posted by onalark on Sep 29, 2012 - 7 answers

## How do I calculate the probability of a specific sum of repeated die rolls?

I'm looking to learn how to calculate probabilities for a multi-round dice game. I've researched this question some, and it looks like I might need to know how to use the multinomial distribution, but I can't find any good introductions. Please point me to the most layman-accessible educational material on this subject, and help me to help myself.
posted by Richard Daly on Sep 28, 2012 - 6 answers

## Gambling odds question

How would one (legally) take advantage of the change in odds of a given NFL team to win the Super Bowl?
posted by glenngulia on Sep 24, 2012 - 6 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?
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?
posted by cincinnatus c on Sep 19, 2012 - 4 answers

## Numbers Rackets and Benford's Law

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

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

## Why should "e" exist?

Why is the number "e" so...
posted by nondescript on Sep 9, 2012 - 17 answers

## Help me understand a little logic problem.

Help me understand this. Math/logic puzzle follows...
posted by TheHollowSeasThatRoar on Sep 5, 2012 - 6 answers

## Too much noise in my data

Putting on the math signal: calling the statistics-literate. Trying to change my weight/body composition and track progress in a useful way, but I'm having trouble separating normal daily variation from actual real change.
posted by ctmf on Sep 1, 2012 - 15 answers

## Help her learn Alg II by Tuesday

Sister just learned she has to take an Algebra II test on Tuesday that covers the whole shebang. She's forgotten (repressed?) most of it. What's her best bet for an Algebra II crash course that will go over all the topics? She's very smart, but not a math person.
posted by goosechasing on Aug 30, 2012 - 11 answers

## Looking for a new or different High School math test generator, and Apple programs or apps for use in the classroom

I'm looking for software for a high school math teacher: first, a better/newer test generator, and second, in-classroom programs, bonus points for apps for an Apple laptop and/or an iPod touch. Details inside.
posted by filthy light thief on Aug 28, 2012 - 2 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?
posted by sacrifix on Aug 25, 2012 - 16 answers

## The Iceman Wondereth

How much is an ice cube from my fridge worth?
posted by ecorrocio on Aug 23, 2012 - 14 answers

## How does science education work?

What's important for me to know about being a science teacher, since I've only taught math but will now be training teachers of both contents?
posted by violetish on Aug 19, 2012 - 2 answers

## "Why am I supposed to divide here?"

I need books that are good at explaining how to explain things to children.
posted by kingfishers catch fire on Aug 14, 2012 - 5 answers

## My Trig Teachers Name Was Mr. Angle But That Didn't Make Him A Good Teacher.

My math skills are no where near where I'd like them to be. Can you recommend a self-paced math learning site? Pretty much any branch of math can apply.
posted by Ookseer on Aug 13, 2012 - 7 answers

## Math is Hard (I need help)

posted by anastasiav on Jul 22, 2012 - 11 answers

## Recommend a programmer a book that teaches high school maths step by step

Can you recommend a programmer a book that teaches high school maths step by step? I did maths at high scool and I was OK at it. However, fifteen years later, after forgetting almost all the maths I learnt back then, I am diving deep into the theory of programming algorithms (sorting, tree structures, graph algorithms and so forth). I find the programming straight forward, but I am struggling with the theory and proof of algorithmic time and space complexities. I am looking for a book that will cover algebra, logs, limits, inductive proof, matrix manipulation and so forth.
posted by maryrosecook on Jul 21, 2012 - 11 answers

## Mathless Engineer, Need Help!

How can I learn calculus and differential equations well, in a relatively short amount of time?
posted by anonymous on Jul 21, 2012 - 8 answers

posted by brighteyes7 on Jul 20, 2012 - 2 answers

## The Limits of Flatness

Are there an infinite number of 2D shapes?
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.
posted by junipero on Jul 17, 2012 - 19 answers

## Operations in the Klasies Caves

I was helping my 4th grade age sister-in-law with her math homework, and came across a question that I couldn't figure out. Can you do it?
posted by symbollocks on Jul 13, 2012 - 13 answers

## Math of Astrology

Could you recommend a book or web site on the math of astrology?
posted by Paquda on Jul 11, 2012 - 7 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.
posted by cincinnatus c on Jul 10, 2012 - 15 answers

## Physical Mathematics?

Is there a book that teaches math via physics?

## Best network/graph theory software for non-techies?

I'm teaching a minicourse about networks, graphs, and computation to a non-technical audience (mostly grad students in the humanities.) What's the right software platform?
posted by escabeche on Jun 18, 2012 - 7 answers

## Pocket Anthropology

Is there a way to find out approximately when I left this wad of money in my (very old) jacket pocket, using statistics and date/number info from the bills? What would be the minimum number of bills needed for such a thing?
posted by nile_red on Jun 17, 2012 - 10 answers

## It's a piece of cake to bake a pretty cake

How do I score my fantasy cake contest in the most fair manner?
posted by disillusioned on Jun 14, 2012 - 9 answers

I'm a math PhD student with two years left. I'm not sure I want a job in academia (but maybe I do). What should I be doing to maximise chances of success (whatever that means)?
posted by hoyland on Jun 12, 2012 - 13 answers

## Why can the reals be well-ordered but not countable?

Math-Filter - Set theory edition: I am struggling with the difference between countable infinite sets and well-ordering. Longer explanation inside.
posted by heybearica on Jun 12, 2012 - 16 answers

## An odd property of Eigenvectors

The first eigenvector is related to the sum of the columns of a matrix. What is this property called?
posted by bessel functions seem unnecessarily complicated on Jun 9, 2012 - 7 answers

## Math Geeks!! Assistance needed!!

How should a surcharge be calculated?
posted by elf27 on Jun 7, 2012 - 11 answers

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