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proofs without words
Tiling a Chessboard with Dominoes (Opposite Colors Removed)
November 18, 2011
N Choose 2 is the Sum of the First N-1 Integers
October 2, 2011
Möbius Transformations are Isometries of a Sphere
July 23, 2011
False Proof—31.5 = 32.5
July 7, 2011
Geometric Series with Geometric Proofs
July 5, 2011