851 posts tagged with math.
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Details of the German Tank Counting Method.

Details of the German tank counting method (as seen on reddit)? [more inside]
posted by tehgeekmeister on Sep 19, 2007 - 13 answers

Difficult as ABC

ABC x D = BADC. What single numbers (1-9) do the letters represent? Is there any way to arrive at the answer (a) by logical deduction all the way rather than with some trial-and-error and (b) so that a 10-year-old can follow the logic? [more inside]
posted by londongeezer on Sep 16, 2007 - 15 answers

looking for a sign

Is there a symbol for the phrase "and/or"? [more inside]
posted by jak68 on Sep 15, 2007 - 19 answers

It felt like I cheated...

How do I solve this puzzle mathematically, rather than programmatically? [more inside]
posted by anomie on Sep 13, 2007 - 12 answers

We Don't Need No Stinking Derivatives

Obscure Mathfilter: In the arcane past of mathematics, there is something known as a "Newton Polygon", which theoretically can be used to help sketch functions of two variables, say, x^3 + y^3 =3xy, for instance. But -- [more inside]
posted by wittgenstein on Sep 13, 2007 - 4 answers

Question about Number Theory Text

Question about Hardy's "An Introduction to the Theory of Numbers". [more inside]
posted by tehgeekmeister on Sep 12, 2007 - 9 answers

Fizzix

I want to start teaching myself physics, but how? [more inside]
posted by god particle on Sep 11, 2007 - 12 answers

Favorite Integral Tables?

What's your favorite math reference book, specifically for integrals? [more inside]
posted by kiltedtaco on Sep 5, 2007 - 13 answers

I need to learn basic to fairly advanced Math and English and I'm somewhat of a rookie who is taking action. Help!!

I'm looking to rebuild my mathematics skills from the ground up so that I have proper habits. I'm looking to start from the basics and go straight up to calculus. Math was a subject in which I didn't pay as much attention to as I wish that I had and am looking to find the best sources of information on the subject. I also would love software that would drill me kind of like speed reading software but for math. [more inside]
posted by Chamunks on Sep 4, 2007 - 22 answers

What are some fun math problems with integer answers from 0-18?

What are some (easy to moderate difficulty) math problems with integer answers ranging from 0-18? I'm making mathematical seating cards where guests will solve a problem to find their table number. [more inside]
posted by Alison on Aug 30, 2007 - 25 answers

Solve this math puzzle. Then explain it to me.

Math puzzle filter. How do you go about solving this puzzle? [more inside]
posted by batcrazy on Aug 28, 2007 - 25 answers

math-challenged needs formula to constrain images for php + gd image manipulation

I need a formula or actual php code to generate a new height and width that will constrain the image between a maximum height and a maximum width while retaining the correct proportions of the original image. [more inside]
posted by sjarvis on Aug 13, 2007 - 10 answers

Bubbles

Maximal volume of an ellipsoid... [more inside]
posted by Blazecock Pileon on Aug 7, 2007 - 15 answers

Formulas for Food

Looking for math formulas involving food. [more inside]
posted by JaySunSee on Aug 4, 2007 - 5 answers

6.08 seconds = $165.50

Does anyone have any data for human error while operating a timing device? Litigeous details and much [more inside]
posted by jmugrapler on Aug 3, 2007 - 31 answers

Lotto Odds!!

Statistics/Lottery question; Please settle this argument between a friend and I about the Florida state lotto. [more inside]
posted by boyinmiami on Aug 2, 2007 - 26 answers

Books on survey design and analysis?

I'm looking for books on survey design and statistical analysis. [more inside]
posted by crazycanuck on Jul 31, 2007 - 4 answers

math-and-logic-filter: only two more floors - I'm almost there! or am I?

math-and-logic-filter: only two more floors - I'm almost there! or am I? [more inside]
posted by krautland on Jul 20, 2007 - 31 answers

Memorizing Math Formulas

Any tips or tricks to memorizing financial math formulas [more inside]
posted by JaySunSee on Jul 16, 2007 - 11 answers

Seeking reading material before jumping into a master's in applied math...

Starting this fall, I plan on taking some preparatory undergrad coursework with the intention of eventually applying to a master's program in applied mathematics. I am seeking suggestions for reading material concerning the field of mathematics in general, both as a refresher and as insight into current focus areas and work being done. As a working engineer, my situation and background might be a bit different from most considering this route... [more inside]
posted by Bugg on Jul 15, 2007 - 2 answers

¿¿why so trippy??

What kind of interference-pattern phenomenon have I got going on here? [more inside]
posted by garethspor on Jul 8, 2007 - 8 answers

Help me make the graph my boss imagined!

Graphing question: My boss has an idea of how our data should be presented. Please help me figure out how to make it happen! [more inside]
posted by nprigoda on Jul 4, 2007 - 5 answers

Math Problem

Arby's is better at math than me... [more inside]
posted by jjbb on Jul 3, 2007 - 28 answers

math

Ask Mathfilter: I want some good math sites to read. A math-cetric Metafilter or Cosma's notebooks. [more inside]
posted by tylermoody on Jul 2, 2007 - 11 answers

Join some of the dots, throw the rest away

Map geeks: can I generate a polygon shapefile from the outline of a large collection of points? There's more detail, of course. [more inside]
posted by genghis on Jun 26, 2007 - 17 answers

Statistics: tell me about r-square for nonlinear models

StatisticsFilter: Can someone explain - with examples - why R^2 (r-square) values are not appropriate for use with non-linear regression models. [more inside]
posted by jonesor on Jun 21, 2007 - 5 answers

Dyscalculia Schools

What schools in the US will waive math requirements for people with dyscaculia? [more inside]
posted by SansPoint on Jun 19, 2007 - 16 answers

How to write a mathematics paper

I need to write a document with a lot of algebraic formulas. What word processor / page layout program would make this quickest and easiest? [more inside]
posted by rolypolyman on Jun 18, 2007 - 25 answers

Mystery Equation

Mystery Equation: x2+y2=(1-z)z4 A friend of mine has a bet regarding whether anyone can figure out what it represents. It's supposed to be mildly romantic. Ideas?
posted by Firas on Jun 16, 2007 - 30 answers

Sock quality modelling and optimisation?

Let's say I buy s socks. Now, these socks feel the very best (have a quality factor of 100) after f wearings, and must be discarded (have a quality factor of zero) after f × 100 wearings. I want to add these socks to a pool from which I draw two daily, and want to maximise the probability of selecting socks with the highest quality over the life of the pool... [more inside]
posted by TheNewWazoo on Jun 14, 2007 - 24 answers

Donald in Mathmagic Land

I want to find an online version of "Donald in Mathmagic Land." [more inside]
posted by inconsequentialist on Jun 10, 2007 - 9 answers

Two spheres colliding

Help me with the math of two spheres colliding [more inside]
posted by RobotHero on Jun 10, 2007 - 8 answers

Why do I hate 8?

Why is it hard for me to perform simple mental calculations with certain numbers? [more inside]
posted by lalex on Jun 5, 2007 - 19 answers

To doublemajor or not to doublemajor?

I'm a math major, but dont know exactly what I want to do. Should I also major in Physics? Economics? [more inside]
posted by milestogo on Jun 4, 2007 - 13 answers

Equation solving help for the intellectually challenged

(x + y)-(x*y)=79. What are x and y? [more inside]
posted by prentiz on Jun 4, 2007 - 17 answers

Help me get up to speed with Matlab.

What are the best online and offline learning materials for Matlab? [more inside]
posted by fake on May 23, 2007 - 9 answers

How to administer a read-aloud math test

Suggestions/resources for administering a math test out loud? [more inside]
posted by Sweetie Darling on May 21, 2007 - 9 answers

Equal and Opposite Reaction?

Physics: Difference between two people pulling on each end of a rope, and one person pulling on a rope tied to a tree. [more inside]
posted by voidcontext on May 18, 2007 - 35 answers

Math help for the right brained

I have a math question involving combinations and sets. [more inside]
posted by sonofslim on Apr 28, 2007 - 21 answers

To leading order?

In the context of information theory, what does "to leading order" mean? [more inside]
posted by tehgeekmeister on Apr 13, 2007 - 9 answers

Algorithm to display a schedule calendar with specific constraints

I've charged with adding a feature to a shift scheduler / coverage requestor that displays shift information for a given week. I've been able to display them so as to satisfy the constraints I've been given, but it's got me wondering wondering if there's a more rigorous/mathematical approach to the general problem of organizing the display of any such calendar information. [more inside]
posted by Frankieist on Apr 12, 2007 - 3 answers

Puppets no can read good?

I need help writing a puppet show to teach the importance of literacy to kids k-5. [more inside]
posted by magikker on Apr 4, 2007 - 8 answers

i need a good stat textbook for self study.

i've been looking at reviews on amazon for introductory stat textbooks, and i can't seem to find a single one that doesn't have blatantly contradictory reviews. [more inside]
posted by tehgeekmeister on Apr 2, 2007 - 8 answers

Tower....to the moon!

Math Question Kinda: I realize it's not possible. But if it was....how tall would the structure need to be if it were to be seen from both US coasts. Or is it impossible because of the curvature of the earth or whatever else I'm not thinking about it. [more inside]
posted by ryecatcher on Mar 22, 2007 - 26 answers

Calculate length of a pipe from the volume it holds

How long would a 3/4 inch inner diameter pipe need to be to hold exactly 27 gallons of water? [more inside]
posted by putzface_dickman on Mar 22, 2007 - 33 answers

How to know if two proportions are statistically significant?

How do I determine whether the difference between two or more proportions is significant? [more inside]
posted by lunasol on Mar 16, 2007 - 7 answers

E-learning for math

What e-learning systems provide students with the math-related symbols they need and lets them "show their work," while still letting them submit all answers online? [more inside]
posted by ejvalentine on Mar 14, 2007 - 8 answers

I need suggestions for Math Movies

(Stereotype-flouting) Math Movie Suggestions Needed for a pi-day celebration. I'm looking for movies that don't portray mathematicians as schizophrenic or otherwise deranged. [more inside]
posted by ZeroDivides on Mar 7, 2007 - 30 answers

What are the best rules, formulas and tricks in math?

MeFites: Share with me your favorite math tricks, truisms and formulas that clarified and simplified math problems and made life easier in high school and college. [more inside]
posted by dropkick on Feb 24, 2007 - 59 answers

Self-teaching algebra

I'm looking for textbook suggestions for teaching myself algebra and trigonometry. Are there any algebra textbooks that stand out as exceptionally good? [more inside]
posted by rolypolyman on Feb 21, 2007 - 7 answers

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