** Mathematics** is the study of

3D illustration of a stereographic projection from the north pole onto a plane below the sphere. Image credit: |

In

Intuitively, then, the stereographic projection is a way of picturing the sphere as the plane, with some inevitable compromises. Because the sphere and the plane appear in many areas of

** Conway's Game of Life** is a

- ...that there are precisely six
convex regular polytopes in fourdimensions ? These are analogs of the fivePlatonic solids known to theancient Greeks . - ...that a nonconvex
polygon with threeconvex vertices is called apseudotriangle ? - ...that it is possible for a three dimensional figure to have a finite
volume but infinitesurface area ? An example of this isGabriel's Horn . - ... that as the
dimension of ahypersphere tends to infinity, its "volume " (content) tends to 0? - ...that the primality of a number can be determined using only a single division using
Wilson's Theorem ? - ...that the line separating the
numerator anddenominator of afraction is called aif written as a diagonal line or asolidus if written as a horizontal line?vinculum

The ** Mathematics WikiProject** is the center for mathematics-related editing on Wikipedia. Join the discussion on the project's

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