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Izidor Hafner
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Demonstrations 461  480 of 821
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
Nicomedes's Mechanism for Constructing a Conchoid
Tangent to a Cycloid
Mechanism for Constructing Regular Polygons
Trisecting an Angle Using a Conchoid
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