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Izidor Hafner
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Demonstrations 541  560 of 904
Truth Tellers on Tuesdays
Seating Friends around a Table
Logic Metapuzzle Generator
A Puzzle about Labeled Logicians
Alternative on the Island of Knights and Knaves
Stable and Unstable Faces of Antiprisms
Tangent on a Logarithmic Spiral
Radius of Curvature of Catenary
How Old Were Some Famous Mathematicians?
Sylvester's Postage Stamp Problem
Inconsistent Set of Statements
Heppes's TwoTip Tetrahedron
Trick to Multiply by N1 in Base N
Disappearing Lines in a Rectangle
Disappearing Lines around a Circle
Some Simple Logic Problems
Exercises in Limits from Above and Below
Multisecting an Angle Using Archimedes's Spiral
Equality of a Segment and an Arc in Archimedes's Spiral
Measuring Angles Using Diagonal Lines
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