389 posts tagged with Mathematics.
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Episciences Project

Tim Gowers has announced a series of arXiv overlay journals called the Episciences Project that aim to exclude existing publishers from research publication in mathematics. As arXiv overlays, the Episciences Project avoids the editing and typesetting costs that existing open-access journals pay for using article processing charges. The French Centre pour la Communication Scientifique Directe (CCSD) is backing the remaining expenses, such as developing the platform. [more inside]
posted by jeffburdges on Jan 19, 2013 - 11 comments

Love in the Time of Neuroinformatics

"The models we discuss belong to the class of two-variable systems with one delay for which appropriate delay stabilizes an unstable steady state. We formulate a theorem and prove that stabilization takes place in our case. We conclude that considerable (meaning large enough, but not too large) values of time delay involved in the model can stabilize love affairs dynamics." [more inside]
posted by bluefly on Jan 16, 2013 - 12 comments

Numberphile: videos about numbers and stuff

Numberphile is a website containing short videos (approx. 5-10 min.) about numbers and stuff. Mathematicians and physicists play around with the tools of their trade and explain things in simple, clear language. Learn things you didn't know you were interested in! Find out why 493-7775 is a pretty cool phone number! What's the significance of 42, anyway? What the heck is a vampire number? Why does Pac-Man have only 255 screens? Suitable for viewing by everyone from intelligent and curious middle-schoolers to math-impaired adults. Browse their YouTube channel here. (Via)
posted by BitterOldPunk on Dec 29, 2012 - 20 comments

The Museum of Mathematics

Last night was the grand opening of the Museum of Mathematics in New York City, the only museum of its kind in North America. The video is narrated by MoMath's chief of content, mathematical sculptor George Hart (better known in some circles as Vi Hart's dad.) The sculpture of the space of three-note chords in the video is based on the work of Dmitri Tymoczko, and the lovely curved hammock of strings a visitor is sitting in at the end is a ruled quadric surface. Many more videos at the Museum of Mathematics YouTube channel. Coverage from the New Scientist. (Previously on MetaFilter.)
posted by escabeche on Dec 13, 2012 - 24 comments

"The data that we actually used."

Rosalind.info is a website with bioinformatics problems inspired by Project Euler (previously, previouslier.) [more inside]
posted by lizarrd on Dec 8, 2012 - 21 comments

Making things with Maths

Making things with Maths (sic)
posted by Evernix on Dec 7, 2012 - 34 comments

An example of "order out of chaos"

"Draw some random points on a piece of paper and join them up to make a random polygon. Find all the midpoints and connecting them up to give a new shape, and repeat. The resulting shape will get smaller and smaller, and will tend towards an ellipse!" [code to make this in Mathematica] [a version which allows you to watch the process step by step, with 10 vertices or 100]
posted by ocherdraco on Dec 3, 2012 - 65 comments

direct realism

The Nature of Computation - Intellects Vast and Warm and Sympathetic: "I hand you a network or graph, and ask whether there is a path through the network that crosses each edge exactly once, returning to its starting point. (That is, I ask whether there is a 'Eulerian' cycle.) Then I hand you another network, and ask whether there is a path which visits each node exactly once. (That is, I ask whether there is a 'Hamiltonian' cycle.) How hard is it to answer me?" (via) [more inside]
posted by kliuless on Dec 1, 2012 - 19 comments

Potatoes and Math

Maximum gravy: Vi hart, daughter of George & mathemusician at The Khan Academy, cooks mathematical potatoes to go along with a symmetrical Turduckenen. Have a delicious Thanksgiving. [more inside]
posted by growabrain on Nov 22, 2012 - 21 comments

Skill-Luck Continuum

"We have little trouble recognizing that a chess grandmaster’s victory over a novice is skill, as well as assuming that Paul the octopus’s ability to predict World Cup games is due to chance. But what about everything else?" [Luck and Skill Untangled: The Science of Success]
posted by vidur on Nov 20, 2012 - 16 comments

Significand of the figure

From the somewhat arbitrary and dimensionful to the timeless classic, one man's subjective list of notable properties of specific numbers. [more inside]
posted by Talkie Toaster on Nov 8, 2012 - 39 comments

There is Nothing New Under the Sun

She sat zazen, concentrating on not concentrating, until it was time to prepare for the appointment. Sitting seemed to produce the usual serenity, put everything in perspective. Her hand did not tremble as she applied her make-up; tranquil features looked back at her from the mirror. She was mildly surprised, in fact, at just how calm she was, until she got out of the hotel elevator at the garage level and the mugger made his play. She killed him instead of disabling him. Which was obviously not a measured, balanced action--the official fuss and paperwork could make her late. Annoyed at herself, she stuffed the corpse under a shiny new Westinghouse roadable whose owner she knew to be in Luna, and continued on to her own car. This would have to be squared later, and it would cost. No help for it--she fought to regain at least the semblance of tranquillity as her car emerged from the garage and turned north. Nothing must interfere with this meeting, or with her role in it. "Melancholy Elephants," an enthralling, Hugo Award-winning short story by Spider Robinson about a disciplined operative, a powerful senator, and a crucial mission to preserve humanity's most precious resource. (some spoilers inside) [more inside]
posted by Rhaomi on Oct 27, 2012 - 14 comments

Boaler and the math wars

"Milgram and Bishop are opposed to reforms of mathematics teaching and support the continuation of a model in which students learn mathematics without engaging in realistic problems or discussing mathematical methods. They are, of course, entitled to this opinion, and there has been an ongoing, spirited academic debate about mathematics learning for a number of years. But Milgram and Bishop have gone beyond the bounds of reasoned discourse in a campaign to systematically suppress empirical evidence that contradicts their stance. Academic disagreement is an inevitable consequence of academic freedom, and I welcome it. However, responsible disagreement and academic bullying are not the same thing. Milgram and Bishop have engaged in a range of tactics to discredit me and damage my work which I have now decided to make public." Jo Boaler, professor of mathematics education at Stanford, accuses two mathematicians, one her colleague of Stanford, of unethical attempts to discredit her research, which supports "active engagement" with mathematics (aka "reform math") over the more traditional "practicing procedures" approach. [more inside]
posted by escabeche on Oct 18, 2012 - 119 comments

What is the smallest prime?

What is the smallest prime? "It seems that the number two should be the obvious answer, and today it is, but it was not always so. There were times when and mathematicians for whom the numbers one and three were acceptable answers. To find the first prime, we must also know what the first positive integer is. Surprisingly, with the definitions used at various times throughout history, one was often not the first positive integer (some started with two, and a few with three). In this article, we survey the history of the primality of one, from the ancient Greeks to modern times. We will discuss some of the reasons definitions changed, and provide several examples. We will also discuss the last significant mathematicians to list the number one as prime."
posted by escabeche on Sep 18, 2012 - 61 comments

The purpose of life is to keep the SF's score low.

N Is a Number: A Portrait of Paul Erdős is a 1993 documentary directed by George Paul Csicsery about the life of mathematician Paul Erdős. Paul Erdős (26 March 1913 -- 20 September 1996) was a Hungarian mathematician. Erdős published more papers than any other mathematician in history, working with hundreds of collaborators. He worked on problems in combinatorics, graph theory, number theory, classical analysis, approximation theory, set theory, and probability theory. He is also known for his "legendarily eccentric" personality. (Previously he was mostly a number)
posted by Obscure Reference on Sep 14, 2012 - 19 comments

Robert MacPherson interviewed

Robert MacPherson interviewed as part of the Simons Foundation's Science Lives series. MacPherson is among the founders of the modern theory of singularities, points like a kink in a curve where the geometry of a space stops being smooth and starts behaving badly. In the interview, MacPherson talks about cultural differences between math and music, his frustration with high school math, growing up gay in the South and life as a gay man in the scientific community, smuggling $23,000 in cash into post-Soviet Russia to help mathematicians there keep the lights on, catastrophe theory, perverse sheaves, how to be a successful graduate student, stuttering, and of course the development of the intersection homology theory for which he is most well-known.
posted by escabeche on Sep 12, 2012 - 5 comments

Mathematics world abuzz with a proof of the ABC Conjecture

Shinichi Mochizuki believes that he has found a connection between prime numbers by developing a 500 page proof of the ABC conjecture [more inside]
posted by zeoslap on Sep 11, 2012 - 55 comments

Knots in Spaaaaace

The fine people over at the International Guild of Knot Tyers Forum talk knots. On Mars.
posted by Foci for Analysis on Sep 4, 2012 - 33 comments

While almost unknown to Americans, many Europeans have treasured these portraits

Cliff Stoll makes glass Klein bottles. He also sells imported portraits of Gauss.
posted by madcaptenor on Aug 29, 2012 - 26 comments

William Thurston

"The real satisfaction from mathematics is in learning from others and sharing with others." William Thurston, one of the greatest mathematicians of the 20th century, has died. He revolutionized topology and geometry, insisting always that geometric intuition and understanding played just as important a role in mathematical discovery as did the austere formalism championed by the school of Grothendieck. Thurston's views on the relation between mathematical understanding and formal proof are summed up in his essay "On Proof and Progress in Mathematics." [more inside]
posted by escabeche on Aug 22, 2012 - 32 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

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..." [more inside]
posted by kliuless on Jul 21, 2012 - 78 comments

The Art of π, φ and e

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

Unlearning Math

Learning and Unlearning Math explores topic in mathematics from the perspective of a teacher. The author has developed series of articles on such varied topics as Multiplication, Quantity, Central Tendency, Math in Comics, and things not taught in schools. More recently, the blog has focused on the conventions for Mathematical Notation.
posted by borges on Jun 7, 2012 - 20 comments

"I asked myself,'Why can't it work?'"

16 year old student from Germany solves 350 year old Isaac Newton puzzle Shourryya Ray, a 16-year-old German student, has cracked a puzzle that has stumped mathematicians since Sir Isaac Newton first posed the problem more than 350 years ago. The teen's solutions allow exact calculations of a trajectory under gravity and subject to air resistance. Bonus video of Neil Degrasse Tyson talking about Newton.
posted by THAT William Mize on Jun 4, 2012 - 19 comments

Because Print Is Not Yet Dead

Free online graph paper generators: variations of squares, triangle, rhombus, and hexagonal, circular and polar, for drawing, gaming, writing, note-taking and much more. Blank Sheet Music (Flash) for all arrangements (PDF). Create and edit your own grids, probability and logarithmic graphs, petri-dish inserts and storyboards. Also, multilingual  monthly and yearly calendars. Plus, more than you ever wanted to know about ISO paper dimensions and printable paper models of polyhedra. Prev-ious-ly.
posted by Bora Horza Gobuchul on May 28, 2012 - 36 comments

One Big Mac plus another Big Mac....

That the conventional wisdom of 3,500 calories less is what it takes to lose a pound of weight is wrong. The body changes as you lose. Interestingly, we also found that the fatter you get, the easier it is to gain weight. An extra 10 calories a day puts more weight onto an obese person than on a thinner one. [more inside]
posted by Ruthless Bunny on May 16, 2012 - 125 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? [more inside]
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

The Strangest Man

The trend of mathematics and physics towards unification provides the physicist with a powerful new method of research into the foundations of his subject, a method which has not yet been applied successfully, but which I feel confident will prove its value in the future. The method is to begin by choosing that branch of mathematics which one thinks will form the basis of the new theory. One should be influenced very much in this choice by considerations of mathematical beauty. [1939] [more inside]
posted by smcg on Apr 28, 2012 - 8 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 Shory Biography of Emmy Noether

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

Still plenty of room for improvement

"He is the kind of boy who is bound to be rather a problem in any school or community, being in some respects definitely anti-social." Alan Turing's school reports.
posted by verstegan on Mar 22, 2012 - 34 comments

The Hacker Shelf

The Hacker Shelf is nice crowd-sourced guide to (legally) free books on various computational and mathematical subjects. The topics page gives you an idea of the breadth of material available.
posted by philipy on Mar 15, 2012 - 24 comments

You Complete Me

What is the minimal number of clues necessary to create a uniquely solvable Sudoku puzzle? It turns out to be 17, though it took fancy symmetry arguments and nearly a year of computer time to prove it. But no need to read the paper when you can watch the video.
posted by Obscure Reference on Mar 14, 2012 - 54 comments

My best known work is in game theory

"I hope my handwriting, etc. do not give the impression I am just a crank or circle-squarer."
posted by vidur on Feb 22, 2012 - 22 comments

Pineapple under the sea.... Really?

So, Nickelodeon, you tell us that Spongebob Squarepants lives in a pineapple upside down house at the bottom of the sea. Are you really sure about that? Beware of misleading your viewers about the universe, Nickelodeon! [more inside]
posted by rongorongo on Jan 29, 2012 - 66 comments

garden of quasiperiodic rhombus tilings

Need some quasiperiodic tilings? Alan Schoen has a smorgasbord of tilings of rhombuses with pentagonal, heptagonal, and nonagonal symmetry that come in many flavors. Be sure to check out his page on triply periodic minimal surfaces and the other curios at his Geometry Garret.
posted by oonh on Jan 8, 2012 - 9 comments

Mathematics and the Great Pyramid

This is a radical statement about the Pyramid, especially on the internet because all web pages that I have been able to find that deal with the Pyramid, maintain that it was built and/or inspired by either God or space aliens. Most don't even consider that it could be a rational structure designed and built by normal people.
posted by troll on Dec 30, 2011 - 42 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

Two PDFs about PDFs

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

Applied Ultrafinitism OR Amending a Forgotten Parameter

S. Ekhad , E. Georgiadis, D. Zeilberger"How to Gamble If You're In a Hurry."  arXiv:1112.1645v1 (pdf), 7 Dec 2011. [more inside]
posted by jeffburdges on Dec 14, 2011 - 3 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

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...
[more inside]
posted by Rhaomi on Nov 6, 2011 - 88 comments

Knotty Problems

Science through yarn: Wooly Thoughts. The Home of Mathematical Knitting, including knitted klein bottles and hyperbolic planes. The Museum of Scientifically Accurate Fabric Brain Art (previously). Much, much, more on knitting, crochet and quilting used to visualize complex theories in topology, probability, chaos and fractals. [more inside]
posted by Bora Horza Gobuchul on Nov 6, 2011 - 8 comments

Jewish Problems

This is a special collection of problems that were given to select applicants during oral entrance exams to the math department of Moscow State University. These problems were designed to prevent Jews and other undesirables from getting a passing grade. (via Hacker News)
posted by veedubya on Oct 11, 2011 - 48 comments

Museum of Mathematics, NYC

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

Creating the Future of Education and Work

In February 2011, every teacher in Providence, Rhode Island was pink slipped. Not all 1,926 of them got fired, of course, but with the district facing a $40 million deficit, anything is possible. The district says it needs flexibility, just in case. Every school district in the United States faces its own version of what’s happening in Providence. However, “IMAGINATION: Creating the Future of Education and Work” is focused not on how we got here but rather how we can move forward from here immediately even as the education system continues to struggle. [more inside]
posted by netbros on Sep 15, 2011 - 49 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

The mathematical sculptures of Henry Segerman

Henry Segerman creates mathematical sculptures using 3D printing: Round Möbius Strip, Hopf Fibration, Half of a 120-cell, Rectified Tesseract, Tesseract and 16-cell, Hilbert Curve, Knotted Cogs, Round Klein Bottle [more inside]
posted by Foci for Analysis on Sep 10, 2011 - 12 comments

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