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Ed Pegg Jr.
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Demonstrations 1  20 of 370
Small Hadamard Matrices
New this month
Right Tetrahedron: de Gua Theorem
The Tetartoid
Substitution Tilings
GeometricScene Triangle Centers
Primes in the Heegner Fields
Eisenstein Triples
Magic Zero Hexagons
Mondrian Art Problem
Horizontal and Vertical Line Tests
Bad Fraction Simplification
Dice Transitivity
General Parabola Equation
FourPoint Parabolas
Percentages are Reversible
Apollonian Edge Circles
Magic Squares and Designs
The Set of Sets in SET
Wichmann Columns
Plain Bob Bell Ringing
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