MetaFilter posts tagged with Math
http://www.metafilter.com/tags/Math
Posts tagged with 'Math' at MetaFilter.Mon, 08 Feb 2016 21:34:50 -0800Mon, 08 Feb 2016 21:34:50 -0800en-ushttp://blogs.law.harvard.edu/tech/rss60More kids more math
http://www.metafilter.com/156961/More%2Dkids%2Dmore%2Dmath
"You wouldn't see it in most classrooms, you wouldn't know it by looking at slumping national test-score averages, but a cadre of American teenagers are reaching world-class heights in math—more of them, more regularly, than ever before." Peg Tyre in <em>The Atlantic</em> covers <a href="http://www.theatlantic.com/magazine/archive/2016/03/the-math-revolution/426855/">the new wave of deeper, faster, and hopefully broader math education</a>. Featuring:
<a href="http://www.beammath.org/">Bridge to Enter Advanced Mathematics</a>, a program for low-income students in New York City;
<a href="https://www.imo-official.org/">The International Math Olympiad</a>, which the U.S. team <a href="http://www.maa.org/news/us-team-takes-first-place-at-international-mathematical-olympiad">won last summer</a> for the first time in more than 20 years;
<a href="https://www.mathcircles.org/">Math Circles</a> -- find one near you!
<a href="http://www.artofproblemsolving.com/">Art of Problem Solving</a>, a popular online math forum for math-loving kids;
<a href="http://www.proofschool.org/#we-love-math">Proof School</a>, the brand-new math-emphasis high school in San Francisco;
and too many more to link! tag:metafilter.com,2016:site.156961Mon, 08 Feb 2016 21:34:50 -0800escabecheBabylonian (Pre)Calculus!
http://www.metafilter.com/156701/Babylonian%2DPreCalculus
<a href="http://www.nytimes.com/2016/01/29/science/babylonians-clay-tablets-geometry-astronomy-jupiter.html">Signs of Modern Astronomy Seen in Ancient Babylon</a> - "Scientists have found a small clay tablet with markings indicating that a sort of precalculus technique was used to track Jupiter's motion in the night sky." also btw...
-<a href="http://www.npr.org/sections/thetwo-way/2016/01/28/464447490/track-jupiters-path-like-an-ancient-babylonian">Track Jupiter's Path Like An Ancient Babylonian</a>
-<a href="http://www.csmonitor.com/Science/2016/0128/Were-ancient-Babylonian-astronomers-math-whizzes-Check-the-tablets">Ancient Babylonian tablets describe the motion of Jupiter</a>
-<a href="http://www.sciencemag.org/news/2016/01/math-whizzes-ancient-babylon-figured-out-forerunner-calculus">Math whizzes of ancient Babylon figured out forerunner of calculus</a> (<a href="https://twitter.com/GaryMarcus/status/693131477320650752">via</a>)
-<a href="http://www.independent.co.uk/news/science/ancient-babylonians-used-early-calculus-to-track-path-of-jupiter-study-finds-a6840146.html">Ancient Babylonians used early calculus to track path of Jupiter</a>, <a href="http://science.sciencemag.org/content/351/6272/482.full">study finds</a>
more <a href="https://en.wikipedia.org/wiki/Babylonian_mathematics">Babylonian mathematics</a> :P
<a href="http://johncarlosbaez.wordpress.com/2011/12/02/babylon-and-the-square-root-of-2/">Babylon and the Square Root of 2</a> [<a href="https://plus.google.com/u/0/117663015413546257905/posts/UGJtj27dRZS">1</a>,<a href="https://plus.google.com/u/0/117663015413546257905/posts/M28exrNgUhY">2</a>,<a href="https://plus.google.com/u/0/117663015413546257905/posts/baH3euRS9Pf">3</a>]<a href="http://www.metafilter.com/115787/Sure-its-irrational-Just-look#4387486">*</a>
Astroarchaeology/Archaeoastronomy <a href="http://www.metafilter.com/19288/Archaeoastronomy">previously</a>... tag:metafilter.com,2016:site.156701Fri, 29 Jan 2016 13:01:20 -0800kliuless"may someday help in a more objective assignment of books..."
http://www.metafilter.com/156677/may%2Dsomeday%2Dhelp%2Din%2Da%2Dmore%2Dobjective%2Dassignment%2Dof%2Dbooks
<a href="http://www.theguardian.com/books/2016/jan/27/scientists-reveal-multifractal-structure-of-finnegans-wake-james-joyce">Scientists find evidence of mathematical structures in classic books. <small>[The Guardian]</small></a> <a href="https://en.wikipedia.org/wiki/James_Joyce">James Joyce</a>'s <a href="https://en.wikipedia.org/wiki/Finnegans_Wake">Finnegans Wake</a> has been described as many things, from a masterpiece to unreadable nonsense. But it is also, according to scientists at <a href="http://www.ifj.edu.pl/?lang=en">the Institute of Nuclear Physics in Poland</a>, almost indistinguishable in its structure from a purely mathematical <a href="http://imagej.nih.gov/ij/plugins/fraclac/FLHelp/Multifractals.htm">multifractal</a>. <blockquote>"The absolute record in terms of multifractality turned out to be Finnegans Wake by James Joyce. The results of our analysis of this text are virtually indistinguishable from ideal, purely mathematical multifractals," said Professor Stanisław Drożdż, another author of the paper, which has just been published in the computer science journal Information Sciences.
</blockquote> tag:metafilter.com,2016:site.156677Thu, 28 Jan 2016 16:29:54 -0800FizzThe emperor was naked, and so is this.
http://www.metafilter.com/155378/The%2Demperor%2Dwas%2Dnaked%2Dand%2Dso%2Dis%2Dthis
<em>"Respected research math is dominated by men of a certain attitude. Even allowing for individual variation, there is still a tendency towards an oppressive atmosphere, which is carefully maintained and even championed by those who find it conducive to success."</em> Recent Princeton graduate Piper Harron's PhD thesis isn't written for these men. It is very cool number theory, and <a href="http://www.theliberatedmathematician.com/wp-content/uploads/2015/11/PiperThesisPostPrint.pdf">it is art.</a> tag:metafilter.com,2015:site.155378Tue, 08 Dec 2015 21:24:32 -0800bergamot and vetiverNo cutesy adversaries
http://www.metafilter.com/155293/No%2Dcutesy%2Dadversaries
<em>"I think the post-war turn towards social responsibility in science and engineering was less a turn than a sideways glance. .. If researchers like us were actually supposed to know or care about this stuff in any operationally significant way, well, I think we didn't get the memo. <a href="http://web.cs.ucdavis.edu/~rogaway/papers/moral-fn.pdf">So let me retransmit it.</a>"</em>
- <a href="http://faculty.engineering.ucdavis.edu/rogaway/">Phillip Rogaway</a>. <a href="http://web.cs.ucdavis.edu/~rogaway/papers/moral-fn.pdf">The Moral Character of Cryptographic Work</a>. There is a variant of this talk given at UC San Diago on you <a href="https://www.youtube.com/watch?v=HGEEJ44tkKs">youtube</a> and <a href="http://cseweb.ucsd.edu/csevideo/Phillip.Rogaway.mp4">their site</a>, but his ASIACRYPT talk itself has not yet appeared online. tag:metafilter.com,2015:site.155293Sun, 06 Dec 2015 06:56:06 -0800jeffburdgesInternet quizzes are to Metafilter as...
http://www.metafilter.com/155280/Internet%2Dquizzes%2Dare%2Dto%2DMetafilter%2Das
<a href="http://www.thestar.com/news/canada/2015/12/05/are-you-smarter-than-an-8th-grader.html">Are you smarter than an 8th grader?</a> tag:metafilter.com,2015:site.155280Sat, 05 Dec 2015 13:18:30 -0800jacquilynneStatistical heaping, 20 yards, first down
http://www.metafilter.com/154440/Statistical%2Dheaping%2D20%2Dyards%2Dfirst%2Ddown
What I've got: A spreadsheet containing every single play run in the NFL from 2000-2014 (500,000 in all)<br><br>
What I'm going to do with it: <a href="https://gutterstats.wordpress.com/2015/11/03/are-nfl-officials-biased-with-their-ball-placement/">Show that the referees subconsciously change the outcome of a play based on where the painted lines are on a field, and subsequently show that it doesn't matter</a>. tag:metafilter.com,2015:site.154440Wed, 04 Nov 2015 14:53:54 -0800swiftWhere are all the women? The math said there would be more women!
http://www.metafilter.com/154028/Where%2Dare%2Dall%2Dthe%2Dwomen%2DThe%2Dmath%2Dsaid%2Dthere%2Dwould%2Dbe%2Dmore%2Dwomen
<a href="http://www.theatlantic.com/business/archive/2015/10/the-odds-that-a-panel-would-randomly-be-all-men-are-astronomical/411505/">One mathematician's formula suggests that all-male lineups don't "just happen," despite what conference organizers might claim.</a> "...in any conference with over 10 speakers, say, it would be extremely rare to have no female speakers at all—less than 5 percent chance, depending on one's assumption about the percentage of women in mathematics as a whole." tag:metafilter.com,2015:site.154028Wed, 21 Oct 2015 12:08:27 -0800sharp pointy objectsCan an iPad run Drug Wars? Oh... it can?
http://www.metafilter.com/153935/Can%2Dan%2DiPad%2Drun%2DDrug%2DWars%2DOh%2Dit%2Dcan
<a href="http://mic.com/articles/125829/your-old-texas-instruments-graphing-calculator-still-costs-a-fortune-heres-why">The TI-83 graphic calculator is still a standby for mathematics education in America. This Mic.com article looks at some of the causes and effects of that fact.</a> The article mentions <a href="https://www.desmos.com/calculator">Desmos</a>, which is seen as a free, online alternative to the TI-83 for graphing, calculation and analysis. <a href="http://www.theatlantic.com/technology/archive/2011/08/what-your-old-graphing-calculator-says-about-technology/244028/">This Atlantic article covers some of the same ground, indicating why other technology has changed so much, but the TI-83 retains its stranglehold on the market (hint: effective messaging by TI and a reluctance to change in standardized testing protocols).</a> Regardless, the machine still maintains a number of <a href="http://www.ticalc.org/">fans</a> and of course <a href="http://tiwizard.com/games-for-ti-83-plus-and-ti-84-plus/">games programmed in BASIC are still a staple.</a> tag:metafilter.com,2015:site.153935Sun, 18 Oct 2015 09:38:21 -0800codacorollaThe likelihood that there's interesting or important math is pretty high
http://www.metafilter.com/153893/The%2Dlikelihood%2Dthat%2Dtheres%2Dinteresting%2Dor%2Dimportant%2Dmath%2Dis%2Dpretty%2Dhigh
<a href="http://www.nature.com/news/the-biggest-mystery-in-mathematics-shinichi-mochizuki-and-the-impenetrable-proof-1.18509">Shinichi Mochizuki and the impenetrable proof</a> - "Fesenko has studied Mochizuki's work in detail over the past year, visited him at RIMS again in the autumn of 2014 and says that he has now verified the proof. (The other three mathematicians who say they have corroborated it have also spent considerable time working alongside Mochizuki in Japan.) The overarching theme of inter-universal geometry, as Fesenko describes it, is that one must look at whole numbers in a different light — leaving addition aside and seeing the multiplication structure as something malleable and deformable. Standard multiplication would then be just one particular case of a family of structures, just as a circle is a special case of an ellipse." (<a href="https://www.newscientist.com/article/dn26753-mathematicians-anger-over-his-unread-500-page-proof/">previously</a>: <a href="http://www.metafilter.com/119847/Mathematics-world-abuzz-with-a-proof-of-the-ABC-Conjecture">1</a>,<a href="http://www.metafilter.com/127954/Proof-and-Community-Standards">2</a>; <a href="https://twitter.com/Noahpinion/status/652145064043347968">via</a>) <blockquote>"Looking at it, you feel a bit like you might be reading a paper from the future, or from outer space," [<a href="http://www.metafilter.com/user/21049">mefi's own</a>] number theorist Jordan Ellenberg, of the University of Wisconsin–Madison, wrote <a href="https://quomodocumque.wordpress.com/2012/09/03/mochizuki-on-abc/">on his blog</a> a few days after the paper appeared.</blockquote>
also btw...
-<a href="http://www.nature.com/news/maths-whizz-solves-a-master-s-riddle-1.18441">UCLA mathematician Terence Tao has produced a solution to the Erdős discrepancy problem</a> [<a href="http://arxiv.org/abs/1509.05363">1</a>,<a href="https://terrytao.wordpress.com/2015/09/11/the-erdos-discrepancy-problem-via-the-elliott-conjecture/">2</a>,<a href="https://plus.google.com/+DavidRoberts/posts/edR1nqyTGxX">3</a>]
-<a href="https://www.youtube.com/watch?v=XFDM1ip5HdU">What does it feel like to invent math</a>?<a href="http://www.metafilter.com/135502/An-infinite-number-of-mathematicians-walk-into-a-bar#5366342">*</a> tag:metafilter.com,2015:site.153893Fri, 16 Oct 2015 09:34:05 -0800kliulessBlowing the Whistle on the UC Berkeley Mathematics Department
http://www.metafilter.com/153754/Blowing%2Dthe%2DWhistle%2Don%2Dthe%2DUC%2DBerkeley%2DMathematics%2DDepartment
<i>Given the success I am having with students, one might think that the Mathematics Department leadership would be expressing curiosity about how I am achieving that success. Instead, Craig Evans in early 2014 asked me "If you had a job at McDonalds and came along with all these new ideas, how long do you think you'd carry on working there?" <a href="http://alexandercoward.com/BlowingTheWhistleOnUCBerkeleyMathematics.html"> The fact that the now Interim Chair of the UC Berkeley Mathematics Department should compare undergraduate education to fast food reveals everything you need to know about how students are regarded by the leading clique of men at the helm of the Mathematics Department of the number one public university in the world.</a></i> In 2013, Professor Coward also wrote <a href="http://alumni.berkeley.edu/california-magazine/just-in/2014-09-02/cal-lecturers-email-students-goes-viral-why-i-am-not">an e-mail to his students that went viral, wherein he discussed the value of their education, and why he chose not participate in the upcoming graduate student instructor (GSI) strike</a>. tag:metafilter.com,2015:site.153754Sun, 11 Oct 2015 21:30:19 -0800un petit cadeauLearning common core math with a check written by an upset father
http://www.metafilter.com/153278/Learning%2Dcommon%2Dcore%2Dmath%2Dwith%2Da%2Dcheck%2Dwritten%2Dby%2Dan%2Dupset%2Dfather
When the father of a second grader got annoyed by <a href="http://www.corestandards.org/Math/">common core math</a> tools (namely, <a href="https://www.youtube.com/watch?v=p6RaMGDPfJg">ten frame cards</a>), his annoyance went viral when <a href="http://www.buzzfeed.com/morganshanahan/this-dad-wrote-a-check-to-his-kids-school-in-common-core-mat">he wrote a check to his student's school using common core numbers</a>. Then <a href="http://www.patheos.com/blogs/friendlyatheist/2015/09/21/the-dad-who-wrote-a-check-using-common-core-math-doesnt-know-what-hes-talking-about/">the Friendly Athiest on Patheos used that check to teach how common core math works</a> at the second grade level. tag:metafilter.com,2015:site.153278Wed, 23 Sep 2015 19:24:49 -0800filthy light thiefFun math for kids
http://www.metafilter.com/153162/Fun%2Dmath%2Dfor%2Dkids
<a href="https://liorpachter.wordpress.com/2015/09/20/unsolved-problems-with-the-common-core/">Unsolved problems with the common core.</a> Computational biologist (and <a href="http://www.metafilter.com/136576/Network-Nonsense">occasional curmudgeon</a>) Lior Pachter pairs <a href="https://en.wikipedia.org/wiki/List_of_unsolved_problems_in_mathematics">unsolved problems in mathematics</a> to <a href="http://www.corestandards.org/">common core</a> math standards. tag:metafilter.com,2015:site.153162Sun, 20 Sep 2015 13:39:04 -0800quaking fajitaSteve Martin and Robin Williams Riffing on Mathematics
http://www.metafilter.com/153158/Steve%2DMartin%2Dand%2DRobin%2DWilliams%2DRiffing%2Don%2DMathematics
In 2002, Steve Martin sat down for a Q&A about his writing and his interest in mathematics. His friend Robin Williams was on hand to help out. Please pardon the video quality. <a href="https://www.youtube.com/watch?v=FHW45zw23gU">Part 1</a> <a href="https://www.youtube.com/watch?v=wACvhOhHGtU">Part 2</a> <a href="https://www.youtube.com/watch?v=Ai22mQ0zgPo">Part 3</a> <a href="https://www.youtube.com/watch?v=H3xtxE7sw30">Part 4</a> <a href="https://www.youtube.com/watch?v=Jka1yA5O_eU">Part 5</a> tag:metafilter.com,2015:site.153158Sun, 20 Sep 2015 04:04:53 -0800OptamysticYou sank my battleship... with probability!
http://www.metafilter.com/153068/You%2Dsank%2Dmy%2Dbattleship%2Dwith%2Dprobability
<a href="http://cliambrown.com/battleship/">Battleship Probability Calculator</a> by C. Liam Brown. Finds the best squares to try during the game. tag:metafilter.com,2015:site.153068Thu, 17 Sep 2015 06:11:08 -0800WolfdogInspired by mathematical theorems or open problems...
http://www.metafilter.com/152812/Inspired%2Dby%2Dmathematical%2Dtheorems%2Dor%2Dopen%2Dproblems
<a href="http://erikdemaine.org/fonts/conveyer/?text=MetaFilter" title="don't overlook the 'Show Belt' checkbox">Conveyer Belt Font.</a> More <a href="http://erikdemaine.org/fonts/">mathematical and puzzle fonts/typefaces</a> you can play with in your browser. Read about them in the article <a href="http://arxiv.org/pdf/1404.1775v2.pdf">Fun with Fonts: Algorithmic Typography.</a> [PDF] tag:metafilter.com,2015:site.152812Tue, 08 Sep 2015 06:40:06 -0800Wolfdoga(n)=a(n−1)+gcd(n,a(n−1)).
http://www.metafilter.com/152780/anan1gcdnan1
<a href="http://bit-player.org/2015/pumping-the-primes">Go ahead: Press the button.</a> <i> A number is printed on the tape. Press again and another number appears. Keep going. A few more. Notice anything special about those numbers? The sequence begins: 5, 3, 11, 3, 23, 3, 47, 3, 5, 3, 101, 3, 7, 11, 3, 13, 233, 3, 467, 3, 5, 3, . . . </i> tag:metafilter.com,2015:site.152780Sun, 06 Sep 2015 16:30:52 -0800WolfdogCan you add faster than a 5 year old
http://www.metafilter.com/152276/Can%2Dyou%2Dadd%2Dfaster%2Dthan%2Da%2D5%2Dyear%2Dold
CMA is a "brain development program designed to develop higher learning capability and aims to promote mental arithmetic, enhance memory, boost creativity, and increase focus using the principle of Abacus". <a href="https://www.youtube.com/watch?v=MYUcsqx5Bh4">Watch some kids from The Philippines calculates in seconds, using their fingers.</a> (SLYT) tag:metafilter.com,2015:site.152276Thu, 20 Aug 2015 08:25:27 -0800growabrainCosmic Call
http://www.metafilter.com/152016/Cosmic%2DCall
"In 1999, two Canadian astrophysicists, Stéphane Dumas and Yvan Dutil, composed and sent a message into space. The message was composed of <a href="http://pic.blog.plover.com/aliens/dd/index.html">twenty-three pages of bitmapped data</a>, and was sent from the RT-70 radio telescope in Yevpatoria, Ukraine, as part of a set of messages called Cosmic Call." Over the next few weeks, Mark Jason Dominus is writing a series of articles to his blog exploring each of the 23 images. Can you decode their information before reading his explanations?
Three articles are already published:
<ul>
<li><a href="http://blog.plover.com/aliens/dd/intro.html">Introduction</a> (spoiler-free)</li>
<li><a href="http://blog.plover.com/aliens/dd/p00.html">Part 0/23</a> (SPOILERS)</li>
<li><a href="http://blog.plover.com/aliens/dd/p01.html">Part 1/23</a> (SPOILERS)</li>
</ul>
(Cosmic Call and other CETI messages <a href="https://www.metafilter.com/86929/35-years-of-shouting-into-the-abyss">previously</a> on MeFi.) tag:metafilter.com,2015:site.152016Tue, 11 Aug 2015 16:16:23 -0800mbrubeckNew Pentagons
http://www.metafilter.com/152010/New%2DPentagons
<a href="http://www.theguardian.com/science/alexs-adventures-in-numberland/2015/aug/10/attack-on-the-pentagon-results-in-discovery-of-new-mathematical-tile">Mathematicians discover a new type of pentagon that can cover the plane leaving no gaps and with no overlaps.</a> It becomes only the 15th type of pentagon known that can do this, and the first discovered in 30 years. Previously on Mefi: <a href="http://www.metafilter.com/146120/No-Pentagons">No Pentagons</a> (main link isn't working, but check out <a href="https://plus.maths.org/content/trouble-five">The Trouble with Five</a> and <a href="http://mathmunch.org/2013/02/25/marjorie-rice-inspired-by-math-and-subways">this article on Marjorie Rice</a>, an amateur mathematician who discovered four of the 15 known pentagonal tilings, linked in the comments.)
Bonus for '80s math-nerd kids: <a href="https://www.youtube.com/watch?v=sFwSpw7Bv3s">"Tessellations" song from Square One Television.</a> Ooh-bop-bop-ooh! tag:metafilter.com,2015:site.152010Tue, 11 Aug 2015 11:50:26 -0800Metroid BabyOne Way or Another
http://www.metafilter.com/151944/One%2DWay%2Dor%2DAnother
"In a patent dispute between two pharmaceutical giants arguing over who owns the royalty rights to a lucrative wound-dressing solution, their lordships sat in judgment over an issue that would have tested the mettle of the finest mathematical logicians; <a href="http://www.independent.co.uk/news/science/what-exactly-does-one-mean-court-of-appeal-passes-judgement-on-thorny-mathematical-issue-10350568.html">and in the process coined a new legal definition of "one"</a>." "A previous judgment in 2013 ruled in Smith & Nephew's favour because of a mathematical quirk known among chemists as the "significant figures rule", which is a way of taking into account errors of measurement.
...So in this earlier judgment "one" meant anything greater than or equal to 0.95 and less than 1.5, which produced an uncomfortable asymmetry that did not go unnoticed in last week's judgment. How could "one" include something that is 0.05 less but also include something that is nearly ten times this figure more – for instance 0.49 more than 1?" tag:metafilter.com,2015:site.151944Sat, 08 Aug 2015 14:24:46 -0800not_the_waterFamous Fluid Equations Are Incomplete
http://www.metafilter.com/151640/Famous%2DFluid%2DEquations%2DAre%2DIncomplete
<a href="http://www.nytimes.com/2015/07/26/magazine/the-singular-mind-of-terry-tao.html">The Singular Mind of Terry Tao</a> - "<a href="http://thecolbertreport.cc.com/guests/terence-tao/6wtwlg/terence-tao">Imagine</a>, <a href="http://www.smh.com.au/good-weekend/terence-tao-the-mozart-of-maths-20150306-13fwcv.html">he said</a>, that <a href="http://bactra.org/notebooks/tsallis.html">someone awfully clever</a> could <a href="https://en.wikipedia.org/wiki/MONIAC_Computer">construct a machine</a> out of pure water. It would be built not of rods and gears but <a href="http://paulromer.net/why-information-grows/">from a pattern</a> of interacting currents." (<a href="https://twitter.com/Noahpinion/status/624664545995264000">via</a>) <blockquote>Tao has emerged as one of the field's great bridge-builders. At the time of his Fields Medal, he had already made discoveries with more than 30 different collaborators. Since then, he has also become a prolific math blogger with a decidedly non-Gaussian ebullience: He celebrates the work of others, shares favorite tricks, documents his progress and delights at any corrections that follow in the comments. He has organized cooperative online efforts to work on problems. "Terry is what a great 21st-century mathematician looks like," [<a href="http://www.metafilter.com/user/21049">mefi's</a> <a href="http://projects.metafilter.com/4308/How-Not-To-Be-Wrong">own</a>] Jordan Ellenberg, a mathematician at the University of Wisconsin, Madison, who has collaborated with Tao, told me. He is "part of a network, always communicating, always connecting what he is doing with what other people are doing."</blockquote>
<a href="https://plus.google.com/117663015413546257905/posts/EVYdMhSqtWu">also btw</a>...
<a href="https://www.quantamagazine.org/20150721-famous-fluid-equations-are-incomplete/">A 115-year effort to bridge the particle and fluid descriptions of nature has led mathematicians to an unexpected answer</a> - "The evidence suggests that truer equations of fluid dynamics can be found in a little-known, relatively unheralded theory developed by the Dutch mathematician and physicist <a href="https://en.wikipedia.org/wiki/Diederik_Korteweg">Diederik Korteweg</a> in the early 1900s. And yet, for some gases, even the Korteweg equations fall short, and there is no fluid picture at all." tag:metafilter.com,2015:site.151640Wed, 29 Jul 2015 00:34:29 -0800kliulessLoop - Pool on an elliptical table
http://www.metafilter.com/151559/Loop%2DPool%2Don%2Dan%2Delliptical%2Dtable
<a href="http://www.loop-the-game.com">Loop - Pool on an elliptical table.</a> <i>The ellipse has two significant points, called focuses, which have a remarkable geometrical property that is almost always explained using the example of an imaginary pool table.
"If a pool table is the shape of an ellipse, then a ball shot from one focus will always rebound to the other focus no matter in which direction the ball is shot."
That sounded interesting! Wouldn't it be fun, I thought, if I could build one of these imaginary tables?
<a href="http://www.theguardian.com/science/alexs-adventures-in-numberland/2015/jul/16/loop-new-cue-sport-pool-ellipse-elliptical">So I did</a>.</i> tag:metafilter.com,2015:site.151559Sun, 26 Jul 2015 13:54:00 -0800dng"Their little heads are exploding"
http://www.metafilter.com/150636/Their%2Dlittle%2Dheads%2Dare%2Dexploding
<a href="http://bit-player.org/2015/mrs-nguyens-prestidigitation">Mrs. Nguyen's Prestidigitation</a> <i>From a set of 1 through 9 playing cards, I draw five cards and get cards showing 8, 4, 2, 7, and 5. I ask my 6th graders to make a 3-digit number and a 2-digit number that would yield the greatest product...</i> and somehow we end up with lacing diagrams and Python. (<a href="http://fawnnguyen.com/multiplication-finding-the-greatest-product/">The original post on Fawn Nguyen's blog</a>) tag:metafilter.com,2015:site.150636Mon, 22 Jun 2015 06:45:32 -0800WolfdogTime with class! Let's Count!
http://www.metafilter.com/150420/Time%2Dwith%2Dclass%2DLets%2DCount
<a href="https://www.youtube.com/watch?v=Q4gTV4r0zRs">I want to demonstrate how amazing combinatorial explosion is! Please don't stop me. </a> An animation about numbers that get large. It has a happy ending and possibly even a moral. About those "latest algorithmic techniques" mentioned at the end: <a href="http://www-alg.ist.hokudai.ac.jp/~thomas/TCSTR/tcstr_13_64/tcstr_13_64.pdf">Efficient Computation of the Number of Paths in a Grid Graph with Minimal Perfect Hash Functions</a> [PDF] tag:metafilter.com,2015:site.150420Fri, 12 Jun 2015 11:44:44 -0800Wolfdog