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Historical Mathematics
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Demonstrations 1  20 of 326
Ptolemy's Spheres
New this month
Seven Touching Cylinders Puzzle
Updated this month
Circle Packings with Linear Fractional Transformations
Enumerating the Rational Numbers
Vernier Scale with Extra Precision
Infinite Magic Elliptic Curves
Plotting Collatz Sequences
Proposition 30, Book XI, Euclid's Elements
Proposition 29, Book XI, Euclid's Elements
Mock Theta Functions
Hirano's Construction of a Regular Pentagon
Other Formulations of the Collatz Problem
Proposition 1, Book X, Euclid's Elements
Campanus's Sphere
Collaboration Graph for Paul Erdos Coauthors
Social Golfer Problem
Proposition 7, Book XII, Euclid's Elements
The Four KeplerPoinsot Solids
Kepler's Rhombic Solids
Construct Euclid's Regular Dodecahedron
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