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The missing square puzzle is an optical illusion used in mathematics classes to help students reason about geometrical figures; or rather to teach them not to reason using figures, but to use only textual descriptions and the axioms of geometry. It depicts two arrangements made of similar shapes in slightly different configurations.
A new kind of magic square with remarkable properties [2] 1957 Feb: An assortment of maddening puzzles [4] 1957 Mar: Some old and new versions of ticktacktoe: 1957 Apr: Paradoxes dealing with birthdays, playing cards, coins, crows and red-haired typists 1957 May: About the remarkable similarity between the Icosian Game and the Tower of Hanoi ...
Original – The missing square puzzle is an optical illusion used in mathematics classes to help students reason about geometrical figures. It depicts two arrangements of shapes, each of which apparently forms a 13×5 right-angled triangle, but one of which has a 1×1 hole in it.
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Mathnet is a pastiche of Dragnet, in which the main characters are mathematicians who use their mathematical skills to solve various crimes and mysteries in the city, usually thefts, burglaries, frauds, and kidnappings.
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Interactive SVG of The Disappearing Bicyclist – in the SVG file, move the pointer to rotate the disc. A vanishing puzzle is a mechanical optical illusion comprising multiple pieces which can be rearranged to show different versions of a picture depicting several objects, the number of which depending on the arrangement of the pieces.