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An open source, html5 based graphing and computation engine does in your browser what is usually outsourced to the cloud. It graphs, solves, simplifies, integrates and differentiates expressions, and needs no internet connection once you load the page in your browser (or save it on your computer). RTFM.

posted by Obscure Reference on Jan 19, 2011 - 26 comments

posted by Obscure Reference on Jan 19, 2011 - 26 comments

Google is known to ask the following question in job interviews: *In a country in which people only want boys every family continues to have children until they have a boy. If they have a girl, they have another child. If they have a boy, they stop. What is the proportion of boys to girls in the country?* Think you know the answer? If so, Steve Landsburg may be willing to bet you up to $5000. [more inside]

posted by gsteff on Jan 1, 2011 - 279 comments

posted by gsteff on Jan 1, 2011 - 279 comments

"Normal" human pregnancies last 40 weeks, right? Well, no; they can vary quite a bit by the mother's race, age, number of previous children, family history of delivering early or late, home state, work habits, and even the fetus' HLA type. So where does that "40 week" thing come from? Oh, dear. So check out this super-nerdy pregnancy statistics website, from an engineer mom who is collecting data from the public (see the raw data and auto-generated graphs, and read the FAQ about the survey, with more cool graphs). Looking for *day-by-day* probabilities on when that baby's due? This would be your stats table with daily prediction (adjust dates at top of page as needed). Of course, you could always shut up your constantly inquiring relatives and friends another way.

posted by Asparagirl on Dec 16, 2010 - 45 comments

posted by Asparagirl on Dec 16, 2010 - 45 comments

"*A few weeks ago, my algebra class was assigned a project called “Mathematic Karaoke,” for which were told to pick a song, make it about numbers (and stuff), and record ourselves singing it. [....] Of course, Single Ladies was my tune of choice.*"

posted by borkencode on Dec 9, 2010 - 47 comments

posted by borkencode on Dec 9, 2010 - 47 comments

Measure-theoretic probability: Why it should be learnt and how to get started. The clickable chart of distribution relationships. Just two of the interesting and informative probability resources I've learned about, along with countless other tidbits of information, from statistician John D. Cook's blog and his probability fact-of-the-day Twitter feed ProbFact. John also has daily tip and fact Twitter feeds for Windows keyboard shortcuts, regular expressions, TeX and LaTeX, algebra and number theory, topology and geometry, real and complex analysis, and beginning tomorrow, computer science and statistics.

posted by grouse on Dec 5, 2010 - 17 comments

posted by grouse on Dec 5, 2010 - 17 comments

Let's say you're me and you're in math class, and you're supposed to be learning about factoring. Trouble is, your teacher is too busy trying to convince you that factoring is a useful skill for the average person to know with real-world applications ranging from passing your state exams all the way to getting a higher SAT score and unfortunately does not have the time to show you why factoring is actually interesting. It's perfectly reasonable for you to get bored in this situation. So like any reasonable person, you start doodling.[more inside]

posted by ErWenn on Dec 3, 2010 - 27 comments

In today's example of kids smarter than you and I, Wired follows the exploits of two teens competing at the International Olympiad in Informatics.

posted by reenum on Dec 2, 2010 - 14 comments

posted by reenum on Dec 2, 2010 - 14 comments

The OEIS Movie is simply a slideshow of one thousand plots from the Online Encyclopedia of Integer Sequences, at two plots per second with sequence-generated music. [more inside]

posted by Wolfdog on Dec 2, 2010 - 12 comments

posted by Wolfdog on Dec 2, 2010 - 12 comments

A Brief History of Mathematics is a BBC series of ten fifteen-minute podcasts by Professor Marcus du Sautoy about the history of mathematics from Newton and Leibniz to Nicolas Bourbaki, the pseudonym of a group of French 20th Century mathematicians. Among those covered by Professor du Sautoy are Euler, Fourier and Poincaré. The podcasts also include short interviews with people such as Brian Eno and Roger Penrose.

posted by Kattullus on Dec 1, 2010 - 11 comments

posted by Kattullus on Dec 1, 2010 - 11 comments

The Geometry of the Snail Ball [pdf] - an interesting article (with some DIY advice at the end) about a toy shop curiosity you may have encountered.

posted by Wolfdog on Nov 16, 2010 - 25 comments

posted by Wolfdog on Nov 16, 2010 - 25 comments

Kaggle hosts competitions to glean information from massive data sets, a la the Netflix Prize. Competitors can enter free, while companies with vast stores of impenetrable data pay Kaggle to outsource their difficulties to the world population of freelance data-miners. Kaggle contestants have already developed dozens of chess rating systems which outperform the Elo rating currently in use, and identified genetic markers in HIV associated with a rise in viral load. Right now, you can compete to forecast tourism statistics or predict unknown edges in a social network. Teachers who want to pit their students against each other can host a Kaggle contest free of charge.

posted by escabeche on Nov 13, 2010 - 10 comments

posted by escabeche on Nov 13, 2010 - 10 comments

If you look around, you'll see that the ratio of 1.618:1 appears in architecture, nature, and artistic works (such as music, previously). Studied by the Greeks, the Golden Ratio is pretty much everywhere and is common accepted as aesthetically pleasing, and now it has been found to exist down into the nanoscale level, as a byproduct of investigating the Heisenberg Uncertainty Principle. We may not be able to nail down both position and speed, but it appears the macro ratio is an echo of the micro one. [more inside]

posted by Old'n'Busted on Oct 29, 2010 - 31 comments

posted by Old'n'Busted on Oct 29, 2010 - 31 comments

Wondering why the traffic is so slow? WONDER NO MORE! [Via]

posted by Lord_Pall on Oct 26, 2010 - 65 comments

posted by Lord_Pall on Oct 26, 2010 - 65 comments

A brief tour of the mysteriously universal laws of mathematics and nature. [more inside]

posted by kliuless on Oct 24, 2010 - 33 comments

posted by kliuless on Oct 24, 2010 - 33 comments

The evidence that eating a lot of butter will make you better at math is incomplete. The Butter Mind study, to be run from October 20 - November 12, will test the hypothesis that butter improves math performance.

posted by twoleftfeet on Oct 15, 2010 - 39 comments

posted by twoleftfeet on Oct 15, 2010 - 39 comments

This new Australian tv quiz show is so awkward it's endearing, and Lily's good at maths! [more inside]

posted by compound eye on Sep 21, 2010 - 42 comments

posted by compound eye on Sep 21, 2010 - 42 comments

Arthur's Classic Novels has 4000 free ebooks, no registration, nicely organized by author and topics: great old Science Fiction magazines l plentiful online education with 650 books for doctors l a vast collection of famous novels l short stories l by women l Buddhist Scriptures, including The Buddhist Bible, a fave of Jack Kerouac l magazines online l stories by Robert Sheckley l The Autobiography of Charles Darwin l huge collection of fairy tales l philosophy l P. G. Wodehouse l vintage technology l Oscar Wilde l Mark Twain l Rudyard Kipling l George MacDonald l the Koran l a collection of eText resource links. About Arthur Wendover. [more inside]

posted by nickyskye on Sep 16, 2010 - 33 comments

posted by nickyskye on Sep 16, 2010 - 33 comments

How do you calculate Pi? Build a supercomputer. *The Mountains of Pi*, a New Yorker profile of the mathematician (sic) the Chudnovsky brothers. Warning: the article is from 1992, and internet is missing its definite article. (Previously)

posted by OmieWise on Sep 9, 2010 - 31 comments

posted by OmieWise on Sep 9, 2010 - 31 comments

Music is Math (lots of different variations on the page. Watch this one in full screen and with headphones.)

posted by empath on Sep 9, 2010 - 9 comments

posted by empath on Sep 9, 2010 - 9 comments

"Computers can search all possible outcomes of all possible moves in conventional chess and beat even top human players, so Akl wanted to make the computation more difficult." The result? Quantum chess! [via]

posted by brundlefly on Sep 8, 2010 - 31 comments

posted by brundlefly on Sep 8, 2010 - 31 comments

1996 BBC documentary of the proof of Fermat's last theorem is now a Google video. John [Lynch] began researching the project, but Wiles was being very elusive. Although John did not know it, the flaw in Wiles's proof had been found, which is why Wiles was in hiding. Eventually the existence of the flaw emerged, and the TV project was abandoned
A year or so later, the flaw was fixed...
More at SimonSingh.com.

posted by Obscure Reference on Aug 28, 2010 - 12 comments

posted by Obscure Reference on Aug 28, 2010 - 12 comments

"*Michel de Montaigne, whose essays transformed Western consciousness and literature, was not capable of solving basic arithmetic problems. And most other people would not be able to do so either, if not for the invention of decimal notation by an unknown mathematician in India 1500 years ago.*" The Greatest Mathematical Discovery? (expanded pdf) a paper written for the US Dept. of Energy makes this assertion based in part on the work of Georges Ifrah. [via] [more inside]

posted by jessamyn on Aug 26, 2010 - 44 comments

posted by jessamyn on Aug 26, 2010 - 44 comments

posted by Rhaomi on Aug 22, 2010 - 130 comments

The 300th issue of This Week's Finds in Mathematical Physics will be the last. It is not an exaggeration to say that when John Baez started publishing TWF in 1993, he invented the science blog, and an (academic) generation has now grown up reading his thoughts on higher category theory, zeta functions, quantum gravity, crazy pictures of roots of polynomials, science fiction, and everything else that can loosely be called either "mathematical" or "physics."
Baez continues to blog actively at n-category cafe and the associated nLab (an intriguingly fermented commune of mathematicians, physicists, and philosophers.) He is now starting a new blog, Azimuth, "centered around the theme of *what scientists can do to help save the planet*."

posted by escabeche on Aug 14, 2010 - 17 comments

posted by escabeche on Aug 14, 2010 - 17 comments

Learn how to operate the world's first fully electronic digital computer in this helpful instructional video. No, not ENIAC - the Atanasoff Berry Computer. Here's an operator's manual. More information about the reconstruction.

posted by loquacious on Aug 13, 2010 - 24 comments

posted by loquacious on Aug 13, 2010 - 24 comments

Interested in teaching yourself some statistics? Here is an excellent online and interactive statistics textbook developed at UC Berkeley, and also used at CUNY, UCSC, SJSU, and Bard. Here is the syllabus for the course at Berkeley. And here are some insightful reflections from the professor on developing Berkeley's first fully approved online course.

posted by AceRock on Aug 9, 2010 - 18 comments

posted by AceRock on Aug 9, 2010 - 18 comments

Bruce and Katharine Cornwell are primarily known for a series of remarkable animated films on the subject of geometry. Created on the Tektronics 4051 Graphics Terminal, they are brilliant short films, tracing geometric shapes to intriguing music, including the memorable 'Bach meets Third Steam Jazz' musical score in ‘Congruent Triangles.’

posted by Potomac Avenue on Aug 4, 2010 - 8 comments

posted by Potomac Avenue on Aug 4, 2010 - 8 comments

It has applications in Economics, Biology, Pharmaceuticals, and is rooted in State Space Modeling, which with Kalman Filtering (paper, breakdown [warning: long]) was used in the Apollo program. Dynamic Linear Models are gaining in popularity. There exists an R package, and both a short doc and a really great (read: worth buying) book (sorry, not a download, but here's chapter 2) by Giovanni Petris, Sonia Petrone, and Patrizia Campagnoli with its own little website.

posted by JoeXIII007 on Jul 30, 2010 - 14 comments

posted by JoeXIII007 on Jul 30, 2010 - 14 comments

Math Is No Match for Locust Swarms. "Mathematicians have now figured out the dynamics that drive locusts across the landscape, devastating everything underfoot — and the math says people will never be able to predict where the little buggers will go.
The new analysis, reported in an upcoming issue of Physical Review E, suggests that random factors accumulate and influence how swarming locusts collectively decide to change course.
“These swarms are driven by intrinsic dynamics,” says team member Iain Couzin, a biologist at Princeton University. “In all practical terms, predicting when a swarm is going to change direction is going to be impossible." More information here.

posted by Fizz on Jul 27, 2010 - 27 comments

posted by Fizz on Jul 27, 2010 - 27 comments

Editors of the pop-culture magazine *Wired* provided the title "iPhone 4’s ‘Retina’ Display Claims Are False Marketing" to a highly critical article about the new iPhone's high-resolution "Retina" display, so-called as the human eye cannot resolve individual pixels when viewing it. A technician who worked on the Hubble telescope disagreed with the Wired editors' choice of rhetoric in very strong technical terms and issued less stringent disagreement with Raymond Soneira, the writer of the piece. Neuroscientist and photographer Bryan Jones published his own highly readable technical analysis of the display's pixel arrangement, that helped him decide whether Apple's claims were truthful or not.

posted by Blazecock Pileon on Jun 26, 2010 - 64 comments

posted by Blazecock Pileon on Jun 26, 2010 - 64 comments

The great[pdf] Russian mathematican Vladimir Igorevich Arnol'd, foremost modern practitioner of classical mechanics, influential teacher, namesake of a minor planet, and semi-nude cross-country skier has died.

posted by ennui.bz on Jun 11, 2010 - 10 comments

posted by ennui.bz on Jun 11, 2010 - 10 comments

"Gary Foshee, a collector and designer of puzzles from Issaquah near Seattle walked to the lectern to present his talk. It consisted of the following three sentences: "I have two children. One is a boy born on a Tuesday. What is the probability I have two boys?"" [more inside]

posted by andoatnp on May 25, 2010 - 233 comments

posted by andoatnp on May 25, 2010 - 233 comments

posted by Wolfdog on May 16, 2010 - 3 comments

Dan Meyer is a high school math teacher with a clever idea: make math about the real world. On his blog, he writes about classroom management, the real skills of teaching, labels, information design, and assessment.

posted by l33tpolicywonk on May 14, 2010 - 30 comments

posted by l33tpolicywonk on May 14, 2010 - 30 comments

Since its first printing in 1964, Abramowitz and Stegun's Handbook of Mathematical Functions has been a standard (and public domain) reference manual for special functions and applied mathematics. This week, NIST released its successor, the Digital Library of Mathematical Functions, online to the public.

posted by Upton O'Good on May 13, 2010 - 29 comments

posted by Upton O'Good on May 13, 2010 - 29 comments

If politicians were mathematicians. "I would like to suggest two systems for parliamentary votes, one that would weaken the party system but without killing it off entirely, and one that would protect large minorities. Neither has the slightest chance of being adopted, because they are both too complicated to be taken seriously. But mathematicians wouldn’t find them complicated at all — hence the title of this post." Fields medalist Tim Gowers messes around with political axioms.

posted by escabeche on May 12, 2010 - 18 comments

posted by escabeche on May 12, 2010 - 18 comments

A generating function is a way to keep track of a lot of related numbers all at once... The study of generating functions is an art and a science known as 'generatingfunctionology,' and its bible is free for all to download. [more inside]

posted by kaibutsu on Apr 22, 2010 - 25 comments

posted by kaibutsu on Apr 22, 2010 - 25 comments

Every number from 1 to 9,999 has a special meaning. (much mathematical terminology, scrolling)

posted by zardoz on Apr 21, 2010 - 69 comments

posted by zardoz on Apr 21, 2010 - 69 comments

Moving Remy in Harmony - Pixar's Use of Harmonic Functions. [more inside]

posted by Wolfdog on Apr 15, 2010 - 38 comments

posted by Wolfdog on Apr 15, 2010 - 38 comments

Robert Hodgin's Magnetic sculptures: "These forms are created with cylinder magnets, spherical magnets, and ball bearings. Magnetism is the only thing holding the forms together. They are fairly fragile and picking them up will likely crush them. All of the forms I created were variations of the 12 sided dodecahedron. This particular platonic solid seems to be the form the magnets are happiest with." [via]

posted by dhruva on Apr 14, 2010 - 11 comments

posted by dhruva on Apr 14, 2010 - 11 comments

Mathematics Illuminated is a set of thirteen surveys in varied topics in mathematics, nicely produced with video, text, and interactive Flash gadgets for each of the topics.

posted by Wolfdog on Apr 14, 2010 - 8 comments

posted by Wolfdog on Apr 14, 2010 - 8 comments

"Crazy as it sounds, over the next several weeks I’m going to try to do something close to that. I’ll be writing about the elements of mathematics, from pre-school to grad school, for anyone out there who’d like to have a second chance at the subject — but this time from an adult perspective. It’s not intended to be remedial. The goal is to give you a better feeling for what math is all about and why it’s so enthralling to those who get it." Mathematics in the pages of the New York Times! [more inside]

posted by storybored on Apr 11, 2010 - 21 comments

posted by storybored on Apr 11, 2010 - 21 comments

Machinist's cubes (or turner's cubes) are a traditional test of skill for aspiring machinists.

posted by 1f2frfbf on Apr 8, 2010 - 35 comments

posted by 1f2frfbf on Apr 8, 2010 - 35 comments

"Take a little bad psychology, add a dash of bad philosophy and ethics, and liberal quantities of bad logic, and any economist can prove that the demand curve for a commodity is negatively inclined." MIT economist Andrew Lo and string theorist turned asset manager Mark Mueller on the "physics envy" that plagues economics, and how to stop worrying and love uncertainty.

posted by escabeche on Apr 1, 2010 - 37 comments

posted by escabeche on Apr 1, 2010 - 37 comments

Trigonometric Delights. *This book is neither a textbook of trigonometry—of which there are many—nor a comprehensive history of the subject, of which there is almost none. It is an attempt to present selected topics in trigonometry from a historic point of view and to show their relevance to other sciences. It grew out of my love affair with the subject, but also out of my frustration at the way it is being taught in our colleges.*

posted by Wolfdog on Mar 24, 2010 - 18 comments

posted by Wolfdog on Mar 24, 2010 - 18 comments

Sure, big numbers are fine. But infinity (in the set theoretic sense) is where the fun really starts. Developed almost entirely by one man in the late 19th century, set theory now forms the foundation of modern mathematics. Cantor showed that not all infinite sets are the same size. Notably, while there are just as many integers as rational numbers, there are more real numbers than integers. These results, along with others that soon followed like the axiom of choice, led to several fascinating consequences: [more inside]

posted by kmz on Mar 17, 2010 - 161 comments

posted by kmz on Mar 17, 2010 - 161 comments

Everyone knows about the Six Degrees of Kevin Bacon, right? Pursuant to this authoritative source I learned of Erdos numbers, which are fascinating in their own right, but not nearly as much as Erdos-Bacon numbers. Sir Alec Guiness does surprisingly well with a 3. Bacon does not. [more inside]

posted by Elagabalus on Mar 15, 2010 - 60 comments

posted by Elagabalus on Mar 15, 2010 - 60 comments