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Izidor Hafner
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Demonstrations 81  100 of 615
Find the Coefficients of a Partial Fraction Decomposition
Knights and Knaves Puzzle Generator with Not All Statements Determined
Rowing to Shore and Then Running Away
Meissner Tetrahedra
Reconstruction of de DeckerVlacq's 1628 Table of Common Logarithms
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
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