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Izidor Hafner
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Demonstrations 21  40 of 615
Stanley's Congo Expedition
Constructing the Radius of a Ball
Wunderlich's Bistable Octahedron
Gardner's Problem
Steffen's Flexible Polyhedron
HouseLike Solids from Kindergarten Blocks
Polyhedral Maps
Integrating a Rational Function with a Cubic Denominator with One Real Root
Dissecting a Rhombic Dodecahedron of the Second Kind to Half a Cube
Reducing a Differential Equation of a Special Form to a Homogeneous Equation
Some Examples of Ordinary Differential Equations with Missing x or y
Determine the Figures
SevenColoring of a Torus
Logic Problems for Elementary Students
Solving a Linear Equation in One Variable and Two Parameters
Integrating Some Rational Functions
TwistHinged Dissection of a Hexagram to Two Hexagons
Algebraic Problems in Propositional Logic
Some Homogeneous Ordinary Differential Equations
Guess the Color Name
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