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238 posts tagged with mathematics.

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## Need a definite answer for approximately equal

Here's the deal: I've exhausted my neurons looking for some kind of answer to a mathematical symbol stumper. I'd love to know who invented, originated, or was the first individual to use the double-tilde (≈) as a means of expressing/denoting "approximately equal" in mathematics. I know that Robert-Recorde is supposed to have introduced the "equals" sign (=) in 1557. Any and all assistance is greatly appreciated. I await enlightenment.

## I need Math People to help me find out how long it takes 2 Last (Wo)Men on Earth to meet.

How long should it reasonably take before 2 "Last Men on Earth" meet? [more inside]

## Employment for a mathematician?

Job suggestions for a PhD mathematician wanting to leave academia and enter industry? [more inside]

## Help me relearn mathematics and its practica applications

Applied Math Filter: Help me use math!
I'd like to learn more about mathematics and it's practical applications - particularly in Computer Science [more inside]

## Should I try for a computer science degree?

What natural proficiencies would I need / want to have in order to get a degree in computer science? I have some issues with math, and am not sure whether that's a dealbreaker. [more inside]

## How to get to speed in mathematics for a phd?

Looking for programs or study options to fulfill math, statistics and economics prerequisites ahead of applying to grad school? [more inside]

## Editing math papers for spelling and grammar - worth it?

Anyone ever worked as an editor/proofreader for science and mathematics articles not written by native English speakers? [more inside]

## Let he who be without sine...

Why are sine waves considered "pure" tones? Why do we consider sinusoids the building blocks of periodic functions? [more inside]

## Name that number.

Sometime in the past two months, I came across a blog entry (I think) which asked for expressions for the "largest finite number" that could be submitted. Intuitively there is no such thing, but the piece toyed around with that idea. If I recall, there were few if any restrictions on the how the expression was written.
Sorry I can't be more specific than that. I'm not interested in "all you have to do is add one" replies, only pointers to the site if the general parameters of the question are familiar to anyone

## Help me market myself as a new math teacher.

Help me market myself as a secondary math teacher. I am one year out of college with Econ and Finance degrees, have minor classroom experience, and have had jobs irrelevant to education. [more inside]

## Translation of chinese math related words?

Help a chinese student: I am teaching elementary statistic to a young chinese , but I have an hard time explaining him words such as : average, mean, median, mode, quotient, ratio, standard deviation etc.
I am looking for a list of math/science words english<>chine, a mini vocabulary (doc/pdf/whatever) as I don't trust online translation programs too much.

## How can I teach someone high school math in 6 months?

There's a smart freshman who's going to be in my school's Academic Decathlon team next year. However, Academic Decathlon tests over all of high school math, so I ask: How can I teach a fast learner an overview of high school math in around 7 months? [more inside]

## Bingo game with pregenerated winners?

How do I generate a bingo game with a predetermined number of winners? I'll have control over the cards printed and over the list of numbers to be called out. (Specifically, 15 winners out of 15,000 cards.)

## Hey, are you my long lost tenth cousin?

What's the chance that we're related? [more inside]

## Past performance, future results, &c

Statistics-filter: I need to establish to what extent student performance on a particular standardized test is predicted by each of the following: GPA, standardized test scores and a couple of other miscellaneous numerical factors. How do I go about this? [more inside]

## Maths books that focus on the application of the maths concept?

Can you recommend maths books that emphasize the application of the concept being taught? [more inside]

## Math for pre-schoolers

My cousin's four year old son is obsessed with things like quarks and infinity. He insists to his mother that infinity is the last number. She isn't so sure, and wants to know more about things like strangeness.
I don't want to determine this kid's future, but it seems fun to feed his curiosity. And since my wife's babysitter was Murray Gell-Mann, the responsibility has fallen partially on my shoulders to help answer his questions. What kinds of information can you recommend that I give to his mother so that she, an attorney and not a mathematician, and her son can learn more about this information. In particular, what kinds of books, games, and projects would introduce him to other neat ideas in mathematics and physics?

## Why does e^pi * i + 1 = 0 ?

I heard about a book that covered philosophical questions at the core of mathematics. This interests me, but I'm really interested because if I remember correctly it used understanding of euler's identity as an example. What was this book?

## Prude women, more HIV?

I read online that AIDS spreads faster in societies where the women are less promiscuous. What is the best way of creating a model which will show me the development and spread of the virus in the case where women are less vs the case where women are more promiscuous? [more inside]

## Tips for university teaching

Teaching a university course for the first time: any tips or suggestions?
[more inside]

## SVM, HMM, and wavelets in bioinformatics

I'd like to learn about SVM, HMM and wavelet algorithms in their usage in bioinformatics. I have a somewhat rudimentary understanding of the underlying mathematics from Wikipedia and a couple other sources, but I find that a concrete demonstration of their application fleshes it out.
Are there texts, software packages (preferably free) or papers you'd recommend that: 1) includes good starter problem sets, or; 2) demonstrates how these techniques are used in research applications (beyond "we used

*xyz*here"). Thanks!## Help me relate to E8

## How do I determine the growth rate of these numbers?

I have several arrays of numbers. I want to know how they correlate to another array. I think this is called exponential growth, but I can't figure out the formula. [more inside]

## Finding the magnitude of complex fractions

Finding the magnitude of a complex fraction. Is it simply |num|/|denom|? Or is there more to it? [more inside]

## Should I go for it?

I am a new college dropout. The whole incident behind it came as a total shock. I've messed up, I'm lost, and I'm not sure what to do. Naturally, there's a lot more inside. [more inside]

## I feel like I dont know you anymore, math.

How do I make the transition, in my brain, to studying graduate/advanced mathematics? [more inside]

## Inequalities and direction-flipping

Why is it that when I solve the inequality 0 ≤ arccos(x) <> cos(π/4)? Why do the operators switch direction? [more inside]

## mathematics chess book?

is there a book on the mathematics of chess? [more inside]

## Does the study of math sharpen critical thinking skills?

If a man’s wit be wandering, let him post a question about mathematics and reasoning to MetaFilter. [more inside]

## Bubbles

Maximal volume of an ellipsoid... [more inside]

## How many balloons would it take to fill a room?

Packing efficiency of 9" balloons? [more inside]

## 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]

## math

Ask Mathfilter: I want some good math sites to read. A math-cetric Metafilter or Cosma's notebooks. [more inside]

## Books/wares to help kids think like mathematicians?

Books/wares to help kids think like mathematicians? [more inside]

## 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]

## What is the geographical center of Polk County, Florida?

What is the geographical center of Polk County, Florida? [more inside]

## Any recommendations for learning the fundamentals and applications of chaos theory?

Does anyone have any recommendations for books, textbooks, or blogs that discuss the conceptual development of chaos theory? I'd be very interested in its use in applied mathematics over abstract mathematical theory. [more inside]

## 3D Trig question

3D Trig question: I have a 2D square in 3D space (a Face). I know the positions of the four corner vertices in form x,y,z. How do I calculate the rotation in degrees (Euler angles) as relative from the center of the face?
I want to end up with degrees of rotations around x-axis,y-axis,z-axis. Bonus if you can write it in pseudocode.

## The Various Workings of a Cube-Shaped Gallery

Imagine a cube-shaped building, with ten cube-shaped rooms along each side (10 rooms long, 10 high & 10 deep). Each cubular room has 4 walls, 1 ceiling and 1 floor. Each of the 6

*interior*surfaces in all 1000 cubular rooms is decorated with a different piece of art. The rooms can be moved around the building, as if it were an enormous Rubik's cube, but they can also be spun on their axes, so all 6 walls of all 1000 cubes is capable of touching all the others (if the cube is so arranged). How many combinations of art within the 'Cube Gallery' are possible? If you can run me through the workings of the maths I would be extra grateful. Also, what technical words/phrases/language are useful/interesting in expressing this concept? [more inside]## 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]

## 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]

## 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]

## Calculus help neede

Quick help needed for my rusty calculus. Regarding algebraic functions, are the terms "no limit" and "limit does not exist" synonymous?

## Land survey freeware sources?

I am wondering if anyone knows where to find free ware/economical software that will
calculate the surface area of an object defined by a closed curve saved
either as a bitmap or vector image? [more inside]

## How many sides does a circle have?

How many sides does a circle have? I always assumed the answer was an infinite number of sides. My boyfriend disagrees with me and thinks that the answer is zero. My brother seems to think that it depends on your definition of what a side is. I have searched all over but can't seem to find a definitive answer.

## Mathematicial inefficiencies of sports betting markets

Mathematicians, I've always suspected there is a real opportunity to exploit the inefficiencies of the online sports betting markets and amateur bettors and make serious money. Have you felt the same way or am I kidding myself? [more inside]

## Tricky Dick

I remember reading an anecdote about Feynman, written by Feynman either in Surely, You're Joking or What Do You Care What Other People Think. He was describing how in his undergraduate years people were really impressed by his ability to do integrals, all because he knew this integration technique that wasn't taught very often. What was that technique?

## Best science and math sites for educators

Science and math educators, K-12 and college! What are your favourite science and math sites that you use for planning lessons and curricula, or for classroom use? And why? Thanks! [more inside]

## Cyclic and non-cyclic groups

If a group is said to be cyclic if it is generated by a single element (single generator), is the quaternion group an example of a finite group that is not cyclic, since it has four generators {-1, i, j, k}? Also, why is the group of rationals under addition not cyclic?

## Best Probabilty and Statistics textbook?

If you were to buy just one text on probability and statistics (and their applications) that covers the subjects in some depth (building from an introductory college level, through advanced undergraduate to a graduate level and perhaps further) and does a good job of making the basic concepts clear with solved examples (employing those drawn from actual research), which one would you choose?