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907 posts tagged with math.

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## Wearable expressions

What is the math (physics?) going on in this very cool-looking, equations-as-art necklace?

## I can say with 99% confidence that this class is killing me

I'm struggling hard in my statistics class right now. Some of it comes from not grasping the concepts, but a bigger part is the ridiculous level of anxiety I've developed about my grades, and catastrophizing about what a low grade means. Help me attack both aspects of the problem. [more inside]

## I can't do basic math, but my competence is in other things...Help?

We want to assess a list of vendors in two domains: Accessibility and Cost. We have two tools that we are using to essentially score them in each of these domains separately. The Accessibility assessment tool totals 110 points; the Cost tool totals 90 points. We want a final score for each vendor that combines the domains and is out of 100. We want the Accessibility score to "count" about 20% more than the Cost score in the final because it is more important to us. How do we do this? [more inside]

## 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]

## Math/Physics Question: Stability of an abruptly stopped object

If you have an object with a given base length and a given CG height, how fast can it travel before you have to worry about it running over an obstacle and falling over? [more inside]

## How to study math

What is the best way to manage time while studying for upper-division undergraduate math classes that are proof-based/STEM classes in general? [more inside]

## 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!)

## Books about mathematics for the interested layman?

So, physicists like Brian Greene, Lisa Randall, Kip Thorne, and others have written books aimed at an interested lay audience.
What are similar books written by mathematicians?
I'm aware of Godel, Escher & Bach. And that's about it.

## Explain the Riemann-Christoffel curvature tensor

Greetings Ask Metafilter:
Can anyone suggest a book or article that provides a simple, yet comprehensive explanation of the Riemann-Christoffel curvature tensor? I've studied the explanation provided by Lillian Lieber in her book The Einstein Theory of Relativity, but for several reasons I am suspicious of the validity of her derivation, and her claim that the tensor can be used to distinguish between Euclidean and non-Euclidean space.
Lieber gives the Rieman-Christoffel curvature as follows:
{σρ,ε} {ετ,α}- ∂/(∂x_ρ ) {στ,α}+∂/(∂x_τ ) {σρ,α}-{στ,ε} {ερ,α}
Lieber derives the curvature tensor from a covariant tensor of rank one that has undergone two different sequences of covariant differentiation. This supposedly produces two different versions of the second, partial, covariant derivative of a covariant tensor of rank one. [more inside]

## 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]

## How do I learn to be an effective tutor?

If I know the material that I'm teaching well, but don't have any experience with tutoring or teaching, how do I learn the skills and techniques that will help me be an effective tutor? [more inside]

## Clearly, this proves that I'm stupid

I can't seem to wrap my mind around the language of higher level math. Definitions, theorems, and proofs make me fall asleep, but I really do want to understand. Do you know of any good resources that can help me out? [more inside]

## 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]

## Fallacies and Errors in Inferential Statistics

I have recently been introduced to the concept of pseudoreplication as a mistake that people often make when using inferential statistics to evaluate treatment outcomes. My field (evolutionary and conservation biology) makes heavy use of inferential statistics, including techniques that are vulnerable to pseudoreplication, yet nowhere in my formal education have I been taught about how poor experimental design and lack of statistical rigor can lead to fallacies like this. My personal statistical proficiency is poor, but I am working to remedy that. To that end, could folks help me by identifying and ideally explaining whatever other potential pitfalls you can think of, and explaining how they can be avoided through careful experimental design and data-analysis?

## 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]

## 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]

## The heck is a modular form?

For a work assignment, I need to come by a conceptual understanding of modular forms that's light on jargon and, ahem, actual math. If such a thing is possible.

## Teach myself Math virtually for the first time.

I'm a 21 year old college senior liberal arts major who has managed to slide by in school (and life) without ever really learning math beyond a middle school/very early high school level. For no reason in particular, I've decided that I want to get serious about bettering myself in the math department. How can I teach myself the academic math skills I missed out on? [more inside]

## Online Math Tutor

I'm a college student who is having some issues really understanding Calculus II, which is a problem as A) I am a Comp Sci major, and B) I need to take Calc III as well, and an advanced math elective as well. I've not heard good things about the school provided tutors, (IE, one is not too skilled at math, and the other is really smug and poor pedagogically) and while I could get a private tutor to help me, I was wondering if there are any good resources for online math tutors, like there are for online language tutoring over Skype. Does a directory of such tutors exist, has anyone had a good experience doing this (maybe even with names?), and how much can I expect to pay? [more inside]

## 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]

## Teach me about Applied Math

I'm interested in a Masters in Applied Mathematics in the NYC area. Help me research further. [more inside]

## Weighted mean

Mathematics-filter: If there are seven funds with various charges, how can I work out the allocation to these funds of a fixed amount so that the weighted mean charge is below a certain level and the allocations are of similar sizes? [more inside]

## The use of Linear Algebra in Programming.

I just finished my first course in Linear Algebra. I know a fair amount of Python. Please help me come up with a project that combines the two. [more inside]

## Can't do ALL THE THINGS right now.

In 2013 I will have 2-3 hours a week to spend learning one or more of the following: French, guitar, advanced math (stats, calc). Which will benefit most from this limited amount of study effort? [more inside]

## 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?

## If I Knew the Answer, I Could Probably Give the Question a Good Title

Is there a formula for determining (eg.) how many tracks would fit on a TT 79:57 CDR where the first track was one second, and subsequent tracks added 1 second each? (00:01, 00:02, 00:03, 00:04, &c) [more inside]

## How common are discontinuous tax rates? And why would any nation have them?

I had previously thought nonflat taxes were all marginal, but to my surprise the UK Stamp Duty Land Tax doesn't use marginal rates at all. Are there other taxes like this? And why would a nation implement taxes this way? [more inside]

## What is the point at this!

Here’s a simple computational geometry problem. I am trying to figure out the value at an point of two line segments based off of the values at both of one of the segment’s endpoints.
The problem is that I don’t exactly know the best way of going about finding the value at one of those points.
Here is a reference figure.
Given values
(X_C, YC) = F_C
(X_D, YD) = F_D
How can I calculate the value of F_E, where F_E = (X_E, Y_E), where E is the point on the segment CD, where CD intersects with the line AB?
(Extraneous details inside) [more inside]

## What does a professional statistician do?

(Good) jobs involving probability and statistics other than math teacher or actuary? [more inside]

## How to solve a complex statistics problem with a script?

In this game, you roll a number of six-sided dice to get a

**total**. The total is either the highest single die result, or the sum of any multiples rolled, whichever is higher. For example: If I roll three dice and get a 3, 4, and 6, my total is 6. But if I roll a 4, 4, and 6, my total is 8, the sum of the two 4s. What I want to find out is the mean, median, mode, and standard deviation of the possible totals given N dice. How might I create a simple script to compute this? [more inside]## Help me name my final project.

Help me find a catchy name for my final math project. [more inside]

## Relearning Algebra

I haven't done Math in approximately 5 years. How can I relearn Algebra I and II in 6 weeks? [more inside]

## Turning user input into pie (charts)

WordPressFilter: I'm looking for a plugin/widget/codesnippet that will allow me to create a graph using input from the user. [more inside]

## Need math info interviews

I am interested in becoming a mathematician! I want to do some info interviews to figure out what that actually means for my daily life and future prospects. How do I get started? [more inside]

## Algebra Question

Can anyone help with an algebra question I am trying to help my neice with her homework. [more inside]

## 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]

## 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? [more inside]

## 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?

## 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]

## Practice Probability Word Problems

What great books or resources are there for practicing probability word problems such as for standardized tests like the GRE? [more inside]

## Direct line to Stephen Hawking

Where can I find someone willing to help me do

*relatively*simple (ha!) relativistic time dilation calculations? [more inside]## 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? [more inside]

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

Building website for math students, first-time programmer, need guidance. [more inside]

## 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]

## 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? [more inside]

## 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. [more inside]

## 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]

## 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.

## 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. [more inside]

## 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]