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831 posts tagged with math.

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831 posts tagged with math.

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## An infinite debate?

Got into a debate with a friend regarding a math question - I think our debate reflects his misapplication of finite math reasoning to infinities, but I'm having trouble dredging up what I learned in set theory 10 years ago. Imagine you have a bag that has all of the real numbers from 0 to 2, let's say. What are the odds that if you reach into the bag you pull out a number between 0 and 1.5 ? 75%? 50%? Why? Depending on the answer to this I may have followup questions, but I'll leave it here for now. [more inside]

## "New" math?

Multiple students taking an exam at different times come up with the same baffling answer. Help! [more inside]

## What length to cut pipes for a xylophone?

Need help with some math: figuring out pipe lengths for a xylophone for my daughter's school project. [more inside]

## What the heck is an imaginary exponent?

## Strong Induction

Hey all, just a real quick discrete math induction question inside for anyone willing to help, thanks. [more inside]

## How to find focal length from image magnification % ?

Math/Optics: How can I derive the focal length of a lens from the magnification percentage of an image? [more inside]

## How to be analytically creative?

I have a poetic, creative, intuitive brain. I feel out of my element talking to programmers, mathematicians, and physicists, yet I find their ideas aesthetically intriguing and I want to understand them. [more inside]

## math finance text?

Any recommendations for a good graduate level text book for an introduction to mathematical finance course? [more inside]

## Pie is greater than not pie.

I'm trying to express my love for a certain dessert in a math/logic formula.
I have this:

**π > ∼π**, which I take to mean "Pi is greater than not Pi", and this:**π > ∞-π**, which I take to mean "Pi is greater than Everything but Pi". Do these make any sense or hold up in any legit way?## Game Theory Post Grad studies

Post grad studies in Game Theory? Which universities have a focus in Game Theory? Are there Masters available for this?
Sorry for the grunt like presentation to my question. I just thought the abbreviated style would be best for a summary review of what I'm looking for.
Thanks!

## How to manipulate "12 = x - (square root of x)" into "x="

The solution to 12 = x - (square root of x) is 16, but how do I manipulate the equation to show that? [more inside]

## WidgetFilter

If I know the number of widgets, number of days, and total budget, can I break down a per widget price? [more inside]

## How much extra salt?

Chemistry, math nerds, and smart people please help me with this cooking question involving salt. [more inside]

## Should I pursue my interest and study college physics more?

Should I pursue my interest and study college physics more? Specifically, should I take a year-long calculus-based program, until I get comfortable that I'm on top of it-- and can really judge my level of interest and aptitude fairly?
Considering I'm a Junior English major. Also considering that it's been 15 years since HS algebra and I've never been good at math. But I want to be. [more inside]

## I Need All the Help Ever: Calculus Edition

Help me arm myself for a future-determining showdown with calculus. [more inside]

## not that marriage theorem, another one

A friend in college once mentioned a theorem for deciding the number of people to meet before deciding on the person to marry. Was it just a joke, or is there really such a theorem? [more inside]

## Like two peas in a pot

Mathfilter: Antiderivative explained? [more inside]

## publisher reputation

if I'm looking through a library... does being published with Springer Verglag mean that the research is legit, and does being published with Nova Publishers mean that it isn't?

## Math and Crime

I've been asked to teach a week at a summer university. Help me to design the most awesome computer science/discrete math course ever. [more inside]

## What kind of graph plot am I looking for?

I have a series of tables describing a set of data and their values for certain points in time. I want to create a multi-line chart from this data so I can see the growth curves. Is there a name for this kind of plot? It must be a solved problem and some tools to do this but I can't google for it if I don't know the name of what I want. [more inside]

## calling math/chem geniuses

When doing mixed-operation arithmetic keeping significant figures, do you round after each operation- according to the rules for that particular step? Or do you keep everything in long-form calculator numbers, then round at the final answer? [more inside]

## Sloppy Calculus

Please help me evaluate integrals more accurately. Sloppy calculus is killing me. [more inside]

## Never been near a university, never took a paper or a learned degree.

Why should I study math? [more inside]

## Straightforward Dice Probability

Please refresh my memory with regard to a straightforward question of fair dice and probability. [more inside]

## Ah! Real, living story problems!

Math Filter: I am trying to find a name for this equation. I am not sure if I can solve it given the information that I currently have. [more inside]

## Infinite Economics

Do the economics in Nick Spencer and Christian Ward's

*Infinite Vacation*make sense? Are supply and demand meaningless concepts when an infinite multiverse is brought into the picture? [more inside]## Ghostly miasma and morass: aka basic math proofs

Can someone give me some insight as to how to approach and make sense of mathermatical proofs? [more inside]

## Math skills for 300-level statistics?

I'm about to start a 300-level Statistics course, but my math skills are very rusty. How can I quickly rejuvenate my old skills? [more inside]

## I don't get it.

Please explain this mathematics joke to me. [more inside]

## How to ace every math class I ever take

I just failed my math class (a finance class). I'm smart at math but I don't handle organization well for math-related classes. How can I handle them classes better? [more inside]

## How to count a cribbage hand.

Counting-Filter: A friend once asked me how many points the entire 52-card deck is worth in the game of Cribbage...not that you could actually be dealt the whole deck, but just a curiosity. [more inside]

## Quantitative finance jobs for a pure mathematician

I'm a pure mathematician with a Ph.D. and I'm currently a visiting professor at a large state university. However, I'm looking to switch gears and get into the quantitative finance field. The problem is that I don't know anything at all about finance. I know that there are companies such as D. E. Shaw that hire mathematicians that don't have financial experience; what other companies should I look at? Is there any general advice you'd give someone in my position? Also, I have my Ph.D. from a well-regarded state school, but I'm not an Ivy-leaguer; does that put me at a disadvantage?

## Dyscalculia and logic class

I have a learning disability (dyscalculia/mathematics disorder). Could I handle the formal language component of an undergrad Introduction to Logic class? [more inside]

## When do I look for non-academic jobs?

When do I look for non-academic jobs if I'm trying to transition out of academia, and which jobs do I look for? (I have a math PhD.) [more inside]

## Recommend me a book on Cryptography/Cryptanalysis!

I get to teach myself Cryptography for a class, please help me pick my book! [more inside]

## Answering to Sir What is x

But Sir, what is x? Teaching students algebra for the first time. They keep wanting to put values in for x, and write that down.
E.g. x + x = . Becomes 1 + 1 = 2, in their books. Whereas I want x + x = 2x.
Does anyone have any strategies, or techniques to overcome this? [more inside]

## I am 85% certain I want to be a teacher

I've been seriously considering becoming a high school math teacher. I have some experience teaching in a classroom, and lots of experience tutoring. What I'd like to know now - before I jump into an alternative degree program - is what it's actually like

*being*a teacher day in and day out. If I'm not going to be able to hack it, I'd rather know now. [more inside]## Calculator software

**Me:**Poor student.

**Problem:**The prices of TI calculators are 2 damn high.

**Looking for:**Free software that performs wide range of operations (most important: a "matrix" function that is easy to punch in data).

## How do I fairly assign partial credit?

How do I assign partial credit consistently? [more inside]

## The math of noise

Assuming a grasp of college algebra, what maths would one need to understand the entirety of the wikipedia entry on white noise. Which order would be the most advisable way to learn those maths and which books might be good for a self study on those topics?

## Formula to mesh two gears of arbitrary tooth count/position?

I'm writing a graphics app where I'm generating a simple gear transmission system with a variable number of gears each with variable number of teeth and placed at random orbits around each other. I generate gears in succession, placing and rotating each with respect to its parent/driver gear before moving on to the next. The problem I'm having is how to determine the initial orientation of each subsequent gear such that its teeth are properly meshed with that of its driver. [more inside]

## Textbooks on data mining techniques / statistical analysis on large data sets?

Textbooks on data mining techniques / statistical analysis on large data sets? [more inside]

## WHEN is best time to do homework with 6 year old?

WHEN should I have my six year old first grader do her homework? [more inside]

## Is it possible that an English speaker learning Chinese would develop problems with math?

Is it possible that an English speaker learning Chinese would develop problems with math? [more inside]

## Formula for figuring poker winnings

I need help untangling a formula for tracking poker winnings. All this math is making my head hurt! Totally legal details within. [more inside]

## online MBA ASU Penn State

How math intensive are the online MBA programs from ASU and Penn State? [more inside]

## Why doesn't the OED have better coverage of mathematical terms?

Why doesn't the OED have better coverage of mathematical terms? Is this an area they want to improve on, or have they drawn a line of obscurity somewhere that just leaves out more than I expected? [more inside]

## Problem with permutations

MathFilter: Problem with permutations [more inside]

## Calculus problem involving the disk method

The area between f(x), the x-axis and the lines x=a and x=b is revolved around the x-axis. The volume of this solid of revolution is b^3-a*b^2
for any a,b. What is f(x)? [more inside]

## Cosine of 30?

this isn't homework filter, I promise: what is the cosine of 30?