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# The Cause of the Formation of Meanders in the Courses of Rivers and of the So-Called Baer’s Law

Einstein described the "Tea Leaf Paradox" (more) to explain Baer's Law of erosion.
posted by Algebra on Aug 19, 2012 - 9 comments

# bons mots, poems, math, knitting and logic

Entertaining, collected bon mots and surprisingly interesting, collected poems by various authors. From a likable math brainiac's site, Dr T.E. Forster, a Cambridge University lecturer. He also knits and writes about Buddhist logic [pdf]. Bonus, there's a fun gif.
posted by nickyskye on Aug 16, 2012 - 4 comments

# Fun with kinematics!

Racetrack is a game with very simple rules which nonetheless does a surprisingly good job of simulating the acceleration, braking, and handling of a race car. It can teach not only about inertia and kinematics, but also about optimal racing lines. Racetrack can be played with nothing more than a piece of graph paper and a pen, but there is also an online implementation called Vector Racer.
posted by 256 on Aug 11, 2012 - 42 comments

# "Your argument has to be beautiful."

Paul Lockhart, author of the famous Mathematician's Lament, has a new book coming out called Measurement, which tries to discuss mathematics "as an artful way of thinking and living". Lockhart discusses his passion for math and motives for writing the book in this video.
posted by Rory Marinich on Jul 31, 2012 - 17 comments

# Win with mathb.in!

"MathB.in is a website meant for sharing snippets of mathematical text with others on the web. This is a pastebin for mathematics… The post can be composed in a mixture of plain text, LaTeX and HTML."
posted by grouse on Jul 26, 2012 - 5 comments

# noncommutative balls in boxes

Morton and Vicary on the Categorified Heisenberg Algebra - "In quantum mechanics, position times momentum does not equal momentum times position! This sounds weird, but it's connected to a very simple fact. Suppose you have a box with some balls in it, and you have the magical ability to create and annihilate balls. Then there's one more way to create a ball and then annihilate one, than to annihilate one and then create one. Huh? Yes: if there are, say, 3 balls in the box to start with, there are 4 balls you can choose to annihilate after you've created one but only 3 before you create one..."
posted by kliuless on Jul 21, 2012 - 78 comments

# Piaget Beer Gauge

The Piaget Beer Gauge - a product to clear up visual misunderstandings about height and volume in American bars.
posted by Greg Nog on Jul 19, 2012 - 193 comments

# Why Johnny Can’t Add Without a Calculator

Slate: Technology is doing to math education what industrial agriculture did to food: making it efficient, monotonous, and low-quality.
posted by beisny on Jun 30, 2012 - 70 comments

# The Art of π, φ and e

The Art of π, φ and e
posted by Blazecock Pileon on Jun 26, 2012 - 24 comments

# Linear Programming Will Save Us From the Invisible Hand

As part of Crooked Timber's Seminar on Francis Spufford's work of speculative fiction "Red Plenty." Cosma Shalizi has posted "7800 words about optimal planning for a socialist economy and its intersection with computational complexity theory."
posted by JPD on May 30, 2012 - 24 comments

# Big (and small) Numbers

FatFonts creates numerical fonts where the amount of ink/pixels for each number is in direct proportion to its value.
posted by fearfulsymmetry on May 14, 2012 - 23 comments

# Cool Math Conundrums

In Russian roulette, is it best to go first? | The Mathematics of Tetris | What is the result of infinity minus infinity?
posted by Foci for Analysis on May 14, 2012 - 30 comments

# Sure it's irrational! Just look!

Geometrically the irrationality of the square root of 2 means that there is no integer-by-integer square whose area is twice the area of another integer-by-integer square. A visual proof that the square root of 2 is irrational (not found in previous visual proof post.)
posted by Obscure Reference on May 9, 2012 - 39 comments

# My Prime Factorization Sweater

This is the sweater that proves that I am a Certified Math Nut.
posted by Foci for Analysis on Apr 29, 2012 - 54 comments

# Why Netflix Never Implemented The Algorithm That Won The Netflix $1 Million Challenge Why Netflix never implemented the algorithm that won the Netflix$1 Million Challenge.
posted by reenum on Apr 18, 2012 - 45 comments

# Ice

Ice
posted by jjray on Apr 15, 2012 - 33 comments

# How to quantify all aspects of society

"Samuel Arbesman is a senior scholar at the Ewing Marion Kauffman Foundation and author of the forthcoming book 'The Half-Life of Facts'. His research and essays explore how to quantify all aspects of society."
posted by knile on Apr 10, 2012 - 4 comments

# The mathematical modelling of popular games by Nick Berry

H _ _ _ m _ n, Y a _ _ _ e e, _ _ t t _ _ _ h i p, _ h u t _ s & L a _ _ e r _ , R _ _ k , _ _ n d y _ _ _ _ , and _ _ r t s.
posted by Jasper Friendly Bear on Apr 7, 2012 - 28 comments

# A snack of classical mechanics

What is the Dzhanibekov effect? Known as the Tennis Racket theorem in English and documented by Vladimir Dzhanibekov in 1985 space, it is the result of unstable rotation about a principle axis.
posted by Algebra on Apr 6, 2012 - 21 comments

# A Shory Biography of Emmy Noether

Amalie Noether: The Mighty Mathematician You’ve Never Heard Of
posted by jjray on Mar 27, 2012 - 49 comments

# Machines vast and sinister

We've discussed subblue/Tom Beddard and Mandlebulbs before, but two months ago L'Eclaireur Sévigné asked him to create a few animations for their 147-screen exhibition. And here are the hypnotic, terrifying results.
posted by The Whelk on Mar 23, 2012 - 11 comments

# Solve for Professor X

Pop Culture Math: Artist Matt Cowan breaks down pop-culture icons into basic formulas.
posted by quin on Mar 22, 2012 - 11 comments

# "As you can probably imagine, this took some effort to make."

"The calculator itself is just over 250x200x100 blocks. It contains 2 6-digit BCD number selectors, 2 BCD-to-binary decoders, 3 binary-to-BCD decoders, 6 BCD adders and subtractors, a 20 bit (output) multiplier, 10 bit divider, a memory bank and additional circuitry for the graphing function." Yes, someone built a working scientific calculator, in Minecraft.
posted by jbickers on Mar 21, 2012 - 46 comments

# So that's why they call 'em fractals!

What is a fractional dimension?
posted by Obscure Reference on Mar 17, 2012 - 63 comments

# WHAT TIME IS IT?!

Do you like Adventure Time? (previously) Do you like 8-Bit Game intros? Then you'll like the 8-bit Adventure Time Video Game Intro.
posted by The Whelk on Mar 3, 2012 - 34 comments

# The Angel Problem

The Angel Problem. The Angel and the Devil play a game on an infinite chess board...
posted by Wolfdog on Feb 16, 2012 - 37 comments

# Newton and Leibniz invent calculus.

There were ways to find the tangent to a curve, and the area under one, in an ad hoc manner before the birth of calculus. It was even known that these two were inverses of each other.
posted by Obscure Reference on Feb 10, 2012 - 17 comments

# Number A Day

NumberADay - Every working day, we post a number and offer a selection of that number’s properties.
posted by Wolfdog on Jan 11, 2012 - 30 comments

# Morpion Solitaire

Morpion Solitaire is a very simple pencil-and-paper, line-drawing game for which the best possible score is not known! New records are still being set.
posted by Wolfdog on Jan 8, 2012 - 21 comments

# What is it like to have an understanding of very advanced mathematics?

What is it like to have an understanding of very advanced mathematics? A naive Quora question gets a remarkably long, thorough answer from an anonymous respondent. The answer cites, among many other things, Tim Gowers's influential essay "The Two Cultures of Mathematics," about the tension between problem-solving and theory-building. Related: Terry Tao asks "Does one have to be a genius to do maths?" (Spoiler: he says no.)
posted by escabeche on Dec 24, 2011 - 56 comments

# Monte Carlo

The year was 1945. Two earthshaking events took place: the successful test at Alamogordo and the building of the first electronic computer. Their combined impact was to modify qualitatively the nature of global interactions between Russia and the West. No less perturbative were the changes wrought in all of academic research and in applied science. On a less grand scale these events brought about a [renaissance] of a mathematical technique known to the old guard as statistical sampling; in its new surroundings and owing to its nature, there was no denying its new name of the Monte Carlo method (PDF). -N. Metropolis
Conceptually talked about on MeFi previously, some basic Monte Carlo methods include the Inverse Transform Method (PDF) mentioned in the quoted paper, Acceptance-Rejection Sampling (PDFs 1,2), and integration with and without importance sampling (PDF).
posted by JoeXIII007 on Dec 17, 2011 - 13 comments

An "Exciting Guide to Probability Distributions" from the University of Oxford: part 1, part 2. (Two links to PDFs)
posted by JoeXIII007 on Dec 15, 2011 - 17 comments

Google will now graph! Google Post description. Now... examples! sin(x), exp(x), x^2+2x+1. We're not nearly done...
posted by twoleftfeet on Dec 10, 2011 - 36 comments

For twenty years, the fastest known algorithm to multiply two n-by-n matrices, due to Coppersmith and Winograd, took a leisurely O(n^2.376) steps. Last year, though, buried deep in his PhD thesis, Andy Stothers discussed an improvement to O(n^2.374) steps. And today, Virginia Vassilevska Williams of Berkeley and Stanford, released a breakthrough paper [pdf] that improves the matrix-multiplication time to a lightning-fast O(n^2.373) steps. [via]
posted by albrecht on Nov 29, 2011 - 50 comments

# Eleven Equations True Computer Science Geeks Should (at Least Pretend to) Know

Eleven Equations True Computer Science Geeks Should (at Least Pretend to) Know
posted by Deathalicious on Nov 29, 2011 - 141 comments

# Putting a style in your crimp

Le Crimp (mostly en français) is a French collective that explores organic and abstract geometric [ I | II | III ] (PDFs) approaches to the art of origami. Read the white papers, browse the gallery or watch videos of artworks being made or being used in still-motion animations
posted by Blazecock Pileon on Nov 23, 2011 - 6 comments

# Pythagasaurus

Pythagasaurus is the fabled Tyrannosaurus practiced in the skills of trigonometry and long division. Apparently he knows all eight numbers. [Via]
posted by homunculus on Nov 11, 2011 - 9 comments

# That which does not kill us makes us stronger

> comp.basilisk - Frequently Asked Questions :: Is it just an urban legend that the first basilisk destroyed its creator?
Almost everything about the incident at the Cambridge IV supercomputer facility where Berryman conducted his last experiments has been suppressed and classified as highly undesirable knowledge. It's generally believed that Berryman and most of the facility staff died. Subsequently, copies of basilisk B-1 leaked out. This image is famously known as the Parrot for its shape when blurred enough to allow safe viewing. B-1 remains the favorite choice of urban terrorists who use aerosols and stencils to spray basilisk images on walls by night. But others were at work on Berryman's speculations...

posted by Rhaomi on Nov 6, 2011 - 88 comments

# Bach is easy. If she brings him up, you just smile and you say: “Ahh, Bach.”

Bach as graph. -- An interactive visualization of the Cello Suite No. 1, Prelude.
posted by crunchland on Nov 4, 2011 - 51 comments

# "Try not to think too hard."

Found on a classroom chalkboard: The best statistics question ever.
posted by jbickers on Oct 28, 2011 - 264 comments

# Machines of Paper and Wood

Building a Computer 1: Numerals - recently my kids have been asking me about how computers work. I like to give in-depth answers to such questions, so we set out on a quest to understand how they work... Follow-up parts 2 3 4 5 6 7 8 9 10 11 12 13 14 15.
posted by Wolfdog on Oct 20, 2011 - 17 comments

# Wheels within wheels

The best known packings of equal circles within a circle. Best packings with 1-12 circles. Best packings with 49-60 circles. Best packings with 1093-1104 circles. Also, circles whose areas form a harmonic series. Circles in an isosceles right triangle. Or generate your own circle packings. (Background for beginners: circle packing. Background for experts: circle packing.)
posted by escabeche on Oct 19, 2011 - 29 comments

# Corporate fraud / Benford's law

One way to measure corporate fraud is look at reported numbers and see if they follow Benford's law - number sets that are manipulated usually deviate from Benford's law. A recent analysis of all public companies over the past 50 years has shown a steady upward deviation, strongly suggesting there is more corporate fraud now than ever before (peaked in 2008).
posted by stbalbach on Oct 13, 2011 - 41 comments

# Museum of Mathematics, NYC

Museum of Mathematics. To open in 2012 on 26th St.
posted by skbw on Oct 6, 2011 - 32 comments

# C is still for Cookie, and that's good enough for me

Science! (autoplaying video) The 42nd season of "Sesame Street," which premiered today, will be including a few new educational categories for preschoolers in its usual mix of lessons and parodies: STEM skills — Science, Technology, Engineering and Mathematics. In addition to more scientifically accurate slapstick, characters will try experiments, build bridges and boats, launch rockets and think through problems that require trial and error, observation and data -- all problem areas for America's students.
posted by zarq on Sep 27, 2011 - 34 comments

# Who's afraid of the seven times table?

Who's Afraid of the Seven Times Table? Ernst Kummer, one of the great mathematicians of the late 1800s, was hopeless at arithmetic. He was giving an advanced maths lecture and in the middle of a complicated calculation he needed to know what six times seven was. “Um ... six times seven is ... six times seven . . .” A student put up his hand: “41, Professor.” Kummer chalked 41 on the blackboard. “No, no, Professor!” shouted another. “It’s 44!” Kummer gave the students a quizzical look. “Come, come, gentlemen. It can’t be both. It must be either one or the other!”
posted by storybored on Sep 27, 2011 - 168 comments

# G.H. Hardy reviews Principia Mathematica

"Perhaps twenty or thirty people in England may be expected to read this book." G.H. Hardy's review of Whitehead and Russell's Principia Mathematica, published in the Times Literary Supplement 100 years ago last week. "The time has passed when a philosopher can afford to be ignorant of mathematics, and a little perseverance will be well rewarded. It will be something to learn how many of the spectres that have haunted philosophers modern mathematics has finally laid to rest."
posted by escabeche on Sep 12, 2011 - 29 comments

# Math for Art Students

Systems, networks, and strategies is a math course being developed and taught this semester at the San Francisco Art Institute, by Lee Worden. The course-outline-in-progress is online at the linked wiki, including links to course materials like "the two-in-one-out game," "Places to intervene in a system," on-line flocking simulations, and "street math in graffiti art."
posted by escabeche on Sep 11, 2011 - 46 comments

# Echoes Reality

Max Cooper makes beautiful and twitchy minimal techno with mathematical videos.
posted by empath on Aug 25, 2011 - 19 comments

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