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Izidor Hafner
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Demonstrations 361  380 of 869
The Completeness Theorem of Equivalential Calculus
Reflections of Polycubes in the Three Coordinate Planes
Hinged Dissection of a Generalized Greek Cross to a Square
Determining a HouseLike Solid from Three Orthogonal Projections
Reconstruction of Vega's First Calculation of Pi
Dissecting an Ellipsoid to Form a Heart Shape
TwistHinged Dissection That Doubles the Sides of a Polygon
Equivalential Calculus
Dissecting a Cross of Lorraine to a Greek Cross
Labeled Die
Three Orthogonal Projections of Polyhedra
Esser's Heart Surface
Engineering Drawings
Vega's Calculations of Logarithms
Solid Made of Rectangular Boxes Given by Three Views
Arrangements of Golden Prolate Rhombohedra
Sum of Numbers on Invisible Faces
Halving the Perimeter of a Zigzag Polygon
120 Rhombic Dodecahedra of the Second Kind Arranged in a Ball
Constructing the Cube Root of Two
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