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Izidor Hafner
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Demonstrations 561  580 of 1056
Reconstruction of de DeckerVlacq's 1628 Table of Common Logarithms
The Completeness Theorem of Equivalential Calculus
Hinged Dissection of a Generalized Greek Cross to a Square
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
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
Halving the Perimeter of a Zigzag Polygon
120 Rhombic Dodecahedra of the Second Kind Arranged in a Ball
Constructing the Cube Root of Two
Steinhaus' Billiard Ball Loop
Halving the Perimeter of a HeartShaped Curve
Lindgren's Dissection of a Parallelogram to a Parallelogram
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