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Friday Flash Fun, and other games from the ~~educational~~ entertaining Maths is Fun. Just don't tell the kids they're learning.

posted by kyleg on Sep 16, 2005 - 4 comments

posted by kyleg on Sep 16, 2005 - 4 comments

Jim Loy's Mathematics Page is (among other things) a collection of interesting theorems (like Napoleon's Triangle theorem), thoughtful discussions of both simple and complex math, and geometric constructions (my personal favorite); the latter of which contains surprisingly-complex discussions on the trisection of angles, or the drawing of regular pentagons.

Similarly enthralling are the pages on Billiards (and the physics of), Astronomy (and the savants of), and Physics (and the Phlogiston Theory of), all of which are rife with illustrations and diagrams. See the homepage for much more.

If you like your geometric constructions big, try Zef Damen's Crop Circle Reconstructions.

posted by odinsdream on Sep 14, 2005 - 8 comments

Similarly enthralling are the pages on Billiards (and the physics of), Astronomy (and the savants of), and Physics (and the Phlogiston Theory of), all of which are rife with illustrations and diagrams. See the homepage for much more.

If you like your geometric constructions big, try Zef Damen's Crop Circle Reconstructions.

posted by odinsdream on Sep 14, 2005 - 8 comments

Java applets to help visualize various concepts in math, physics, and engineering

posted by Gyan on Sep 9, 2005 - 13 comments

posted by Gyan on Sep 9, 2005 - 13 comments

Project Euler is a running contest of programming challenges to hone your algorithm skills.
*"Each problem is designed according to a 'one-minute rule', which means that although it may take several hours to design a successful algorithm with more difficult problems, an efficient implementation will allow a solution to be obtained on a modestly powered computer in less than one minute."*

posted by Wolfdog on Aug 20, 2005 - 11 comments

posted by Wolfdog on Aug 20, 2005 - 11 comments

Mathematical Knitting. Knit your own Mobius bands and Klein bottles.

posted by greasy_skillet on Aug 12, 2005 - 8 comments

posted by greasy_skillet on Aug 12, 2005 - 8 comments

Who has the fish? Einstein logic puzzle. If I can do it, you guys can.

posted by swift on Aug 4, 2005 - 53 comments

posted by swift on Aug 4, 2005 - 53 comments

Mathematical proof Mathematical proof that it is impossible to find a girlfriend.
"Without going into the specifics of precisely which traits I admire, I will say that for a girl to be considered really beautiful to me, she should fall at least two standard deviations above the norm." -pdf here- via

posted by bigmusic on Jul 29, 2005 - 27 comments

posted by bigmusic on Jul 29, 2005 - 27 comments

Gödel and the Nature of Mathematical Truth : A Talk with Verena Huber-Dyson

posted by Gyan on Jul 29, 2005 - 77 comments

posted by Gyan on Jul 29, 2005 - 77 comments

The Spidron is an interesting geometric construction that seems to lend itself to folding, dissection, and space-filling in two and three dimensions.

posted by Wolfdog on Jul 17, 2005 - 9 comments

posted by Wolfdog on Jul 17, 2005 - 9 comments

Very few people will ever need to learn the value of pi beyond a handful of digits, but some people are more obsessed than others. They call themselves Piphilologists, and all the pi-memorization writings you could ever possibly want have been compiled into one massive Piphilogical text file. And today, Piphilologists the world over must surely bow in tribute to Akira Haraguchi, who has just recited pi from memory to 83,431 places.

posted by Faint of Butt on Jul 4, 2005 - 22 comments

posted by Faint of Butt on Jul 4, 2005 - 22 comments

Godel's theorems have been used to extrapolate a great many "truths" about the world. Torkel Franzen sets the record straight in his new book Godel's Theorem: An Incomplete Guide to Its Use and Abuse. Read the introduction (PDF). If you want, check out his explanation of the theorems.

posted by Gyan on Jun 29, 2005 - 65 comments

posted by Gyan on Jun 29, 2005 - 65 comments

The Logic of Diversity "A new book, *The Wisdom of Crowds* [..:] by The New Yorker columnist James Surowiecki, has recently popularized the idea that groups can, in some ways, be smarter than their members, which is superficially similar to Page's results. While Surowiecki gives many examples of what one might call collective cognition, where groups out-perform isolated individuals, he really has only one explanation for this phenomenon, based on one of his examples: jelly beans [...] averaging together many independent, unbiased guesses gives a result that is probably closer to the truth than any one guess. While true — it's the central limit theorem of statistics — it's far from being the only way in which diversity can be beneficial in problem solving." (Three-Toed Sloth)

posted by kliuless on Jun 20, 2005 - 6 comments

posted by kliuless on Jun 20, 2005 - 6 comments

Whether its crocheted hyperbolic models or Lorenz manifolds, a lace pi shawl or knit Fibonacci socks, some math geeks find expression in the fiber arts.

posted by madamjujujive on May 30, 2005 - 26 comments

posted by madamjujujive on May 30, 2005 - 26 comments

Mandelbrot explorer 20th century Dutch mathemeticians are cool. http://www.ddewey.net/mandelbrot/

posted by longsleeves on May 24, 2005 - 21 comments

posted by longsleeves on May 24, 2005 - 21 comments

The Prime Number Shitting Bear, Finite Simple Group of Order Two[video], Math Jokes, Physics Jokes

posted by apathy0o0 on May 11, 2005 - 29 comments

posted by apathy0o0 on May 11, 2005 - 29 comments

That, as previously reported, a newly deciphered fragment of the Book of Revelations shows 616 is the true Number of the Beast, rather than the popular 666, is nothing new in the world of those obsessed with codes in the Bible. However, one Bible code in particular -- Theomatics -- has sparked debate among believers and non-believers alike.

posted by me3dia on May 10, 2005 - 25 comments

posted by me3dia on May 10, 2005 - 25 comments

Michael Hutchings' rope trick and Dylan Thurston's two-handed knot-drawing sk1llz. Did you need to kill some time practicing pointless skills today?

posted by Wolfdog on May 6, 2005 - 12 comments

posted by Wolfdog on May 6, 2005 - 12 comments

Saunders Mac Lane, mathematician, has died, age 95. Winner of the National Medal of Science, Vice-President of the National Academy of Science, President of the American Mathematical Society, author of three of the canonical texts in algebra [reg. maybe req., here's a local copy], Mac Lane was also mathematical ancestor to over a thousand mathematicians, father of category theory and homological algebra, and expert in topology, topos theory, group cohomology, logic, and applied mathematics. He was one of the towering figures of postwar mathematics. Remembered by his students and all of us who were affected by his work and his life.

posted by gleuschk on Apr 22, 2005 - 7 comments

posted by gleuschk on Apr 22, 2005 - 7 comments

The Mathematical Fiction Homepage is a collaborative attempt to "collect information about all significant references to mathematics in fiction." Feel free to add classic or recent works in any medium to the collection, or rate existing entries on their mathematical content and literary quality.

posted by mediareport on Apr 18, 2005 - 8 comments

posted by mediareport on Apr 18, 2005 - 8 comments

Mathematics Awareness Month - April 2005: Essays, DVD, Links. Prior MAMs.

posted by Gyan on Apr 1, 2005 - 7 comments

posted by Gyan on Apr 1, 2005 - 7 comments

Crispin Sartwell is a cryptic and sensational man. The Chair of Humanities and Sciences at the Maryland Institute College of Art, he has translated the Tao Te Ching, published philosophy papers and books, maintained pages on hip hop, founded the American Nihilist Party (and gave a speech to young Democrats urging them to reconsider their votes for John Kerry), taught courses on conjuring and illusion, etc. etc. See also his essay on the pagan cult of mathematics and his thought experiment on music.

posted by painquale on Mar 26, 2005 - 17 comments

posted by painquale on Mar 26, 2005 - 17 comments

The New York City Department of Education has recalled 3rd-7th grade basic math prep materials after finding multiple errors. Like what? Multiplication errors, addition errors, poorly worded questions, and **incorrectly spelling Fourth on the cover of the Fourth Grade Book**. "The fact is, if third- or fifth-grade students made the mistakes made in the test prep materials, they would be flunked and no one would be asking them for an explanation."

posted by NotMyselfRightNow on Mar 25, 2005 - 46 comments

posted by NotMyselfRightNow on Mar 25, 2005 - 46 comments

The Geometry Center at the University of Minnesota, while now closed, maintains an awesome website with tons of math resources.
I like sphere eversion, i.e. turning a sphere inside out. Link is to script of video, which explains things pretty well. Here is a clip [QT]. Also good: notes from a class on geometry and the imagination that John Conway and some friends gave awhile back. Old but good.

posted by mai on Mar 1, 2005 - 3 comments

posted by mai on Mar 1, 2005 - 3 comments

Danica McKellar —the former star of The Wonder Years—has her own web site. It's got a great feature where she answers your math questions. No, really. She's got a degree in mathematics and co-authored a paper on percolation and Ashkin-Teller models. No, really.

posted by bbrown on Feb 25, 2005 - 43 comments

posted by bbrown on Feb 25, 2005 - 43 comments

Hypothesis as thought-crime...Now, however, a new brouhaha has erupted [at Harvard]and it seems impossible that Summers [the president]will emerge from this one without serious erosion of his moral authority. The trigger was a statement he made at a conference, suggesting that the reason there are more men than women in the mathematical sciences at top-flight institutions has to do with a small statistical difference in inate ability, which becomes a pretty large disparity when one looks at the 'high end' of the respective distribution curves...
The fatal words did not set forth his main theme, but merely constituted a brief aside, thoroughly hedged and qualified. Nonetheless, they touched off a firestorm of indignation, the most striking aspect of which was the intemperate response of a number of feminist scientists, who offered no counter-arguments, but simply declared the whole idea misogynistic and therefore forbidden intellectual territory.

posted by Postroad on Jan 31, 2005 - 71 comments

posted by Postroad on Jan 31, 2005 - 71 comments

Knight's Tour Notes. More than you ever wanted to know about knight's tours on a chessboard.

posted by Johnny Assay on Jan 20, 2005 - 7 comments

posted by Johnny Assay on Jan 20, 2005 - 7 comments

From MathNet to that silly song about the number nine, Square One was one of my all-time favourite programs as a kid. It hasn't been released on video or DVD, but luckily there are plenty of fansites with video clips, pics, and other media to take you on a trip down mathematical memory lane.

posted by sanitycheck on Jan 18, 2005 - 25 comments

posted by sanitycheck on Jan 18, 2005 - 25 comments

Math And Science Song Information, Viewable Everywhere. For all those times you've needed a catchy acappella tune about doppler shifting *[mp3]* in a hurry, there's now MASSIVE, a fully searchable collaborative database of over 1700 songs about math and science, sponsored in part by the seriously pedagogical Science Songwriters Association. Biz Markie made the cut, and so can you. *[via the always-effervescent Research Buzz]*

posted by mediareport on Dec 27, 2004 - 14 comments

posted by mediareport on Dec 27, 2004 - 14 comments

The Mathematics Genealogy Project. A service of the Department of Mathematics at North Dakota State University, the project intends to "compile information about ALL the mathematicians of the world. [...] It is our goal to list all individuals who have received a doctorate in mathematics." Seven generations from one of my recent professors back to Gauss, six back to Felix Klein (of Erlangen Program and bottle fame), eight back to Jacobi, and nine back to Poisson and Fourier, then Lagrange, then Euler, then the Bernoulli brothers, then Leibniz, and then it blew up at infinity.

posted by gramschmidt on Dec 21, 2004 - 5 comments

posted by gramschmidt on Dec 21, 2004 - 5 comments

Su Doku. Fill in the grid so that every row, every column, and every 3x3 box contains the digits 1 through 9. That's all there is to it. It doesn't sound like much, but it's as addictive as hell. The Times is one publication with a daily puzzle (may be unavailable to overseas readers.) There a tuturial and sample puzzle here (flash).

posted by salmacis on Dec 10, 2004 - 6 comments

posted by salmacis on Dec 10, 2004 - 6 comments

The universe in just two symbols. The rest, as they say, is details. No wonder the "Physics Establishment" is trying to keep this quiet. The author, having conquered the universe in general, tackles poetry, as well.

posted by Wolfdog on Dec 8, 2004 - 20 comments

posted by Wolfdog on Dec 8, 2004 - 20 comments

Minimal surfaces in 3D (red/green, or stereo pairs), with rotate and zoom. If you want to go beyond the eye-candy aspect, here's the obligatory Mathworld link, the classic intuitive explanation, and a raft of additional information. If you *like* eye-candy, don't miss the ray-traced minimal surfaces and these interesting, but non-minimal surfaces.

posted by Wolfdog on Dec 5, 2004 - 7 comments

posted by Wolfdog on Dec 5, 2004 - 7 comments

Thinking Machine 4 *explores the invisible, elusive nature of thought. Play chess against a transparent intelligence, its evolving thought process visible on the board before you.*

From Martin Wattenberg (with Marek Walczak); they have been noted here before.

posted by e.e. coli on Oct 27, 2004 - 11 comments

From Martin Wattenberg (with Marek Walczak); they have been noted here before.

posted by e.e. coli on Oct 27, 2004 - 11 comments

Nick's Mathematical Puzzles. Something to keep you on your toes and exercise your brain this Friday. [not Flash]

posted by Johnny Assay on Oct 1, 2004 - 5 comments

posted by Johnny Assay on Oct 1, 2004 - 5 comments

Maths puzzles and more problems. Found whilst searching for the fiendish the Monty Hall Problem. A Tangled Tale, indeed.

posted by plep on Sep 24, 2004 - 6 comments

posted by plep on Sep 24, 2004 - 6 comments

64=65? there must be some kind of trick to this, right?

posted by pyramid termite on Aug 18, 2004 - 30 comments

posted by pyramid termite on Aug 18, 2004 - 30 comments

"WARNING!!! The puzzles on this site are very difficult, and most require the use of a good spreadsheet program in order to solve them. It will take many hours, perhaps days, to solve each puzzle..."

posted by limitedpie on Aug 11, 2004 - 7 comments

posted by limitedpie on Aug 11, 2004 - 7 comments

The Shapes of Space [note : *pdf, sciam, poincaré conjecture*]

posted by kliuless on Aug 1, 2004 - 4 comments

posted by kliuless on Aug 1, 2004 - 4 comments

I'd like to find the area under these curves... Boobies are good for just about everything. Why not teach calculus with them?

posted by qDot on Jul 31, 2004 - 14 comments

posted by qDot on Jul 31, 2004 - 14 comments

Explorations of computation: the world is numbers, and the divine a mathematician. Maybe. [Flash, Javascript]

posted by stavrosthewonderchicken on Jul 30, 2004 - 5 comments

posted by stavrosthewonderchicken on Jul 30, 2004 - 5 comments

Math that makes you go wow: A multi-disciplinary exploration of non-orientable surfaces.

posted by stavrosthewonderchicken on Jul 29, 2004 - 12 comments

posted by stavrosthewonderchicken on Jul 29, 2004 - 12 comments

A playable version of the Monty Hall problem. More information.

posted by monju_bosatsu on Jul 20, 2004 - 63 comments

posted by monju_bosatsu on Jul 20, 2004 - 63 comments

Coincidence or contortion? Ivan Panin deciphered a numeric code in the Bible. Known as Gematria, the 'code' implies the Bible could not have been written without Holy assistance. Panin offered an open challenge for someone to create text using a similar pattern, yet no one was able to create one(nor tried).

However many people doubt the authenticity of the code though. The code is found in the same verses using different translations. It is also claimed that Panin manufactured his own translations to create this mathematical phenomenon.

Whether or not you believe, you can determine how good or evil any text or website is.

posted by JakeEXTREME on Jun 25, 2004 - 30 comments

However many people doubt the authenticity of the code though. The code is found in the same verses using different translations. It is also claimed that Panin manufactured his own translations to create this mathematical phenomenon.

Whether or not you believe, you can determine how good or evil any text or website is.

posted by JakeEXTREME on Jun 25, 2004 - 30 comments

I always hated math, but I loved Square One Television.

posted by interrobang on Jun 5, 2004 - 28 comments

posted by interrobang on Jun 5, 2004 - 28 comments