mike | Shared With: Everyone - 17 days ago | equation, editor, Latex, mathThis is a great online equation editor. You enter a Latex string (with helper buttons to help you build the equation). Then you can download image to your web site. Amazing!
mike | Shared With: Everyone - May 22 2008 | sudoku, math, group theory, puzzlesThere are only 5 billion essentially distinct Sudoku puzzles (solutions) (proof here using Group Theory and Burnside's Lemma).
mike | Shared With: Everyone - May 11 2008 | sudoku, math, puzzles, programming
mike | Shared With: Everyone - May 10 2008 | math, puzzles
Really interesting problem in recreational mathematics - try to reverse a unit line segment via translations/rotations - but in doing so sweep out a minimal area.
PI/4 is the obvious minimum - but it turns out you can do so in an arbitrarily small area.
What's odd to me, is that any combinations of moves that are either a) rotations about the center and b) translations, CAN NOT achieve an area less than PI/4; so it's counter-intuitive that you can do better than that.
mike | Shared With: Everyone - Dec 22 2007 | biology, math, statistics
mike | Shared With: Everyone - Dec 06 2007 | math, mental
mike | Shared With: Everyone - Dec 05 2007 | computers, math, mathematica, excel, algorithms
mike | Shared With: Everyone - Nov 12 2007 | paper, model, math
mike | Shared With: Everyone - Nov 10 2007 | math, tiling, penrose
mike | Shared With: Everyone - Nov 01 2007 | math, music, singing, group theory
click to playA capella math-nerds. How many math terms can you catch in this song?
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