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Izidor Hafner
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Demonstrations 1  20 of 1300
ASCII Images of Portraits
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School Multiplication
Operations on a Rhombic Dodecahedron
School Addition
A Grill for Secret Writing 2
Addition and Subtraction on a Circular Ruler
Solving a Type of Equation with a Square Root
Inequalities and Equations with Absolute Values
Area of a Polygon on the Integer Lattice
Area of a Triangle on an Integer Grid
Space Visualization Test on Prism Edges
Space Visualization Test on Pyramid Edges
Equations with Fractions
Addition and Subtraction of OneDecimal Numbers Using Rulers
Union and Intersection of Intervals
Division by Successive Subtraction
Vieta's Formula for Quadratic Polynomials
Is This Number a Prime?
3D Grill for Secret Writing
Sturm's Theorem for Polynomials
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