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Historical Mathematics
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Demonstrations 161  180 of 328
A Dissection Proof of Pythagoras's Theorem
Lewis Carroll's Diagram and Categorical Syllogisms
Hasse Diagram of Power Sets
Enumerating Pythagorean Triangles
Vičte's Nested Square Root Representation of Pi
The Eutrigon Theorem
Another Knights and Knaves Puzzle Generator
Deaf Island Puzzle Generator
Propositional Logic Puzzle Generator
Twin Pythagorean Triples
Pentagon Tilings
Bochvar's ThreeValued Logic
Lukasiewicz's ThreeValued Logic
Cayley Tables for Small Groups and Moufang Loops
Heilbronn Volumes
Algebraic Loops (1); Properties
Greek Numerals
Roman Numerals
Labeling the Integer Heptagon
Packing Squares with Side 1/n
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