MetaFilter posts tagged with Math and puzzles
http://www.metafilter.com/tags/Math+puzzles
Posts tagged with 'Math' and 'puzzles' at MetaFilter.Fri, 15 Aug 2014 08:49:44 -0800Fri, 15 Aug 2014 08:49:44 -0800en-ushttp://blogs.law.harvard.edu/tech/rss60It's just a jump to the ... well, in any legal direction really
http://www.metafilter.com/141947/Its%2Djust%2Da%2Djump%2Dto%2Dthe%2Dwell%2Din%2Dany%2Dlegal%2Ddirection%2Dreally
<a href="http://plus.maths.org/content/os/issue12/xfile/index">The Peg Solitaire Army</a> is a problem spun off from a classic recreation, and yet another example of the golden ratio turning up where you least expect it. If you want to look at the game more deeply, George Bell's solitaire pages are the ne plus ultra: There's <a href="http://recmath.org/pegsolitaire/army/index.html">more about the solitaire army (and variants)</a>, ... ... <a href="http://recmath.org/pegsolitaire/index.html">peg solitaire on all kinds of square-grid boards</a> and <a href="http://recmath.org/pegsolitaire/tindex.html">triangular peg solitaire</a>.
If you want to read more about why the traditional cross-shaped, 33-hole board is special, <a href="http://recmath.org/pegsolitaire/papers/Bell_AFreshLookatPegSolitaire_MathMag2007.pdf">A Fresh Look at Peg Solitaire</a> [PDF] explains its unique properties.
If you just want to solve puzzles, there are both <a href="http://recmath.org/pegsolitaire/index.html#games">square and triangular games</a> to play. The <a href="http://recmath.org/pegsolitaire/Tools/g4g7/index.htm">puzzles with diagonal moves allowed</a> are an especially fun variant if you're a jaded veteran of the usual game.
And if you want neat connection to formal languages, <a href="http://arxiv.org/abs/math/0008172">this short paper</a> gives a grammar for recognizing solvable positions in 1-dimensional peg solitaire. tag:metafilter.com,2014:site.141947Fri, 15 Aug 2014 08:49:44 -0800WolfdogVisual Patterns.
http://www.metafilter.com/136750/Visual%2DPatterns
<a href="http://www.visualpatterns.org">Visual Patterns.</a> Here are the first few steps. What's the equation? tag:metafilter.com,2014:site.136750Tue, 18 Feb 2014 05:33:18 -0800WolfdogMagic numbers: A meeting of mathemagical tricksters
http://www.metafilter.com/92250/Magic%2Dnumbers%2DA%2Dmeeting%2Dof%2Dmathemagical%2Dtricksters
"<a href="http://www.newscientist.com/article/dn18950-magic-numbers-a-meeting-of-mathemagical-tricksters.html?full=true">Gary Foshee, a collector and designer of puzzles from Issaquah near Seattle walked to the lectern to present his talk</a>. 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?"" "The event was the Gathering for Gardner earlier this year, a convention held every two years in Atlanta, Georgia, uniting mathematicians, magicians and puzzle enthusiasts. The audience was silent as they pondered the question."
[<a href="http://www.metafilter.com/92182/Martin-Gardner-died">Previous Metafilter thread on the recently deceased Martin Gardner</a>.] tag:metafilter.com,2010:site.92250Tue, 25 May 2010 15:20:56 -0800andoatnpMoving Remy in Harmony
http://www.metafilter.com/91066/Moving%2DRemy%2Din%2DHarmony
<a href="http://www1.ams.org/samplings/feature-column/fcarc-harmonic">Moving Remy in Harmony</a> - Pixar's Use of Harmonic Functions. The AMS has been on a roll with excellent feature columns recently:
<a href="http://www1.ams.org/samplings/feature-column/fcarc-data-matrix">Crypto Graphics</a> (on the 2D data matrices used on stamps and other places)
<a href="http://www1.ams.org/samplings/feature-column/fcarc-kanoodle">Puzzling Over Exact Cover Problems</a> (on Kanoodle, Sudoku, and the dancing links algorithm)
<a href="http://www.ams.org/samplings/feature-column/sports">Mathematics and Sports</a> (tournament scheduling) tag:metafilter.com,2010:site.91066Thu, 15 Apr 2010 08:44:21 -0800WolfdogAll Gnytte Long
http://www.metafilter.com/88291/All%2DGnytte%2DLong
<a href="http://web.mit.edu/puzzle/www/09/puzzles/the_sexaholics_of_truthteller_planet/PUZZLE/">The Sexaholics of Truthteller Planet</a> - yes, it's one of those rotten logic problems, one of many that can be found at Tanya Khovanova's <a href="http://blog.tanyakhovanova.com/?p=181">Math Guide to the MIT Mystery Hunt</a>. tag:metafilter.com,2010:site.88291Wed, 13 Jan 2010 09:16:38 -0800WolfdogDelightful Puzzles
http://www.metafilter.com/87545/Delightful%2DPuzzles
<a href="http://gurmeetsingh.wordpress.com/puzzles/">A gathering of puzzles</a> including many old chestnuts but also perhaps one or two you haven't met before. tag:metafilter.com,2009:site.87545Wed, 16 Dec 2009 12:20:17 -0800WolfdogThe Mathemagician and Pied Puzzler, and others
http://www.metafilter.com/75321/The%2DMathemagician%2Dand%2DPied%2DPuzzler%2Dand%2Dothers
<a href="http://www.g4g4.com/paul/BOOK.pdf"><i>The Mathemagician and Pied Puzzler</i></a> <small>(PDF, rough table of contents <a href="http://www.worldcat.org/oclc/40338600?tab=details">here</a>)</small> is a collection of puzzles created by members of the <a href="http://www.g4g4.com/">Gathering 4 Gardner Foundation</a>, in tribute to <a href="http://www.csicop.org/si/9803/gardner.html">the man himself</a> <small>(<a href="http://www.metafilter.com/mefi/21286">previously</a>)</small>. Also freely available at the G4G site is <em><a href="http://www.g4g4.com/pc/pc92.pdf">Puzzle Craft</a></em> <small>(PDF)</small>, by Stewart Coffin. <small>(<em>The Puzzling World of Polyhedral Dissections</em>, also by Coffin, is available <a href="http://www.johnrausch.com/PuzzlingWorld/default.htm">here</a>.)</small> tag:metafilter.com,2008:site.75321Wed, 01 Oct 2008 19:21:50 -0800cog_nateCryptarithms
http://www.metafilter.com/74607/Cryptarithms
<a href="http://www.geocities.com/Athens/Agora/2160/primer.html"><pre> MEFI<br> META<br>+ ASKME<br>-------<br> FILTER</pre></a>
Each letter corresponds to a number 0-9. The solution is unique. A cryptarithm (or alphametic) is a puzzle in which each digit of an equation is replaced by a different letter. One of the first, and best known, appeared in 1924:
<pre> SEND<br>+ MORE<br>------<br> MONEY</pre>
A collection of classic cryptarithms can be found <a href="http://www.mathematik.uni-bielefeld.de/~sillke/PUZZLES/ALPHAMETIC/">here</a>; some interesting extensions to the concept can be found <a href="http://users.aol.com/s6sj7gt/mikealp.htm">here</a>. And, if you'd like to make your own, the alphametic generator <a href="http://www.tkcs-collins.com/truman/alphamet/alpha_gen.shtml">here</a> and solver <a href="http://www.geocities.com/rbisrael/metic/metic.html">here</a> may be of use. tag:metafilter.com,2008:site.74607Wed, 03 Sep 2008 23:44:39 -0800Upton O'GoodCut The Knot
http://www.metafilter.com/67078/Cut%2DThe%2DKnot
<a href="http://www.cut-the-knot.org/content.shtml">Interactive mathematics miscellany and puzzles</a>, including <a href="http://www.cut-the-knot.org/pythagoras/index.shtml">75 proofs</a> of the Pythagorean Theorem, an <a href="http://www.cut-the-knot.org/ctk/index.shtml">interactive column</a> using Java applets, and <a href="http://www.cut-the-knot.org/pythagoras/tricky.shtml">eye-opening demonstrations</a>. (Actually, <a href="http://www.cut-the-knot.org/Curriculum/index.shtml">much more</a>.) tag:metafilter.com,2007:site.67078Sat, 01 Dec 2007 23:52:10 -0800parudoxSnakes, in my heart-blood warm'd, that sting my heart!
http://www.metafilter.com/61670/Snakes%2Din%2Dmy%2Dheartblood%2Dwarmd%2Dthat%2Dsting%2Dmy%2Dheart
<a href="http://www.vgreality.com/alphaex/flashloader.php?f=flash/slither_demo_v13c.swf&w=430&h=510&n=Slither%20Link">SlitherLink</a> - a little spatial-numerical puzzle. Here's a better exposition of <a href="http://www.nikoli.co.jp/en/puzzles/slitherlink/">the rules</a> from the puzzle's inventors, and another <a href="http://www.puzzle-loop.com/">collection of puzzles</a>. Oh, and a little survey of other sneaky, <a href="http://www.maa.org/editorial/mathgames/mathgames_08_17_06.html" title=did that reference get dated fast or what?>snaky puzzles</a>.</a> tag:metafilter.com,2007:site.61670Thu, 31 May 2007 13:18:36 -0800WolfdogCrosswords with numbers
http://www.metafilter.com/37696/Crosswords%2Dwith%2Dnumbers
<a href="http://www.sudoku.com">Su Doku.</a> 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. <a href="http://www.timesonline.co.uk/section/0,,18209,00.html">The Times</a> is one publication with a daily puzzle (may be unavailable to overseas readers.) There a tuturial and sample puzzle <a href="http://www.puzzle.jp/letsplay/sudokuruleflash-e.html">here</a> (flash). tag:metafilter.com,2004:site.37696Fri, 10 Dec 2004 05:18:34 -0800salmacisOw, my brain!
http://www.metafilter.com/35966/Ow%2Dmy%2Dbrain
<a href="http://www.qbyte.org/puzzles/">Nick's Mathematical Puzzles.</a> Something to keep you on your toes and exercise your brain this Friday. <small>[not Flash]</small> tag:metafilter.com,2004:site.35966Fri, 01 Oct 2004 09:21:02 -0800Johnny AssayA Tangled Tale
http://www.metafilter.com/35809/A%2DTangled%2DTale
<a href="http://mathforum.org/dr.math/faq/faq.classic.problems.html">Maths puzzles</a> and <a href="http://mathforum.org/isaac/mathhist.html">more problems.</a> Found whilst searching for the fiendish <a href="http://www.comedia.com/hot/monty.html">the Monty Hall Problem.</a> A <a href="http://etext.library.adelaide.edu.au/c/carroll/lewis/tangled/index.html">Tangled Tale</a>, indeed. tag:metafilter.com,2004:site.35809Fri, 24 Sep 2004 11:27:04 -0800plepPuzzleFilter.
http://www.metafilter.com/34927/PuzzleFilter
<a href="http://www.geocities.com/bob_kraus_2000/">"WARNING!!! The puzzles on this site are very difficult,</a> 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..." tag:metafilter.com,2004:site.34927Wed, 11 Aug 2004 21:08:52 -0800limitedpieCut the Knot
http://www.metafilter.com/30567/Cut%2Dthe%2DKnot
<a href="http://www.cut-the-knot.org/content.shtml">Cut the Knot.</a> Interactive mathematics miscellany and puzzles. tag:metafilter.com,2004:site.30567Tue, 06 Jan 2004 08:24:09 -0800plepIt all started with rabbits
http://www.metafilter.com/29217/It%2Dall%2Dstarted%2Dwith%2Drabbits
<a href="http://www.mcs.surrey.ac.uk/Personal/R.Knott/Fibonacci/fibpuzzles.html">Fun</a> with <a href="http://pw1.netcom.com/~merrills/fibphi.html">Fibonacci numbers</a>. So you say you scored 130 on yesterday's IQ test, did ya? tag:metafilter.com,2003:site.29217Tue, 28 Oct 2003 08:59:07 -0800archimagoWhat Color is My Hat?
http://www.metafilter.com/7906/What%2DColor%2Dis%2DMy%2DHat
<a href="http://www.worlds-fastest-website.com/why-mathematicians-care-about-hat-color.htm">What Color is My Hat?</a> I [heart] these mathematical conundrums -- simple, easy-to-state, seemingly obvious logic problems that have solutions that completely defy common sense. Here's another you can spring on a friend: "You want to fry up three pieces of french toast. You have a frying pan that is just large enough to accomodate two pieces of bread at a time. If it takes you 30 seconds to fry one side of bread, and each piece of must be fried on both sides, how long will it take you to cook up three pieces (assuming that the act of flipping a piece or adding/ removing it to or from the pan takes no time). Think about it. Answer inside. tag:metafilter.com,2001:site.7906Fri, 25 May 2001 10:22:29 -0800Shadowkeeper