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Izidor. Hafner
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Demonstrations 21  40 of 1056
Two Convex Polyhedra with 12 Common Nets
Orthogonality as well as Equidistance Can Be Used as the Sole Primitive Notion for Euclidean Geometry
Pieri's Ternary Relation and Euclidean Geometry
Normal Forms for Logic Problems
Special Regular Rings with Involution
Von Neumann Regular Rings
20b. Construct a Triangle Given the Length of Its Base, the Difference of Its Base Angles and a Line Containing the Third Vertex
Decorated Polar Zonohedra
Composition of Binary Relations in Sets
Binary Relations among Elements in a Set
Decorated Spirallohedra
Folding Polygonal Nets into Polyhedra
Knights and Knaves Puzzle Generator
Polyhedral Blooms
Mazes on Polyhedra Nets
Reflections of Polycubes in the Three Coordinate Planes
Mazes on Polyhedra Maps
Dissecting a Cube into a Tetrahedron and a Square Pyramid
Nets of Polyhedra with Texture
Find the Opposite Face
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