** Mathematics** is the study of

A ** number** is an

Numbers can be classified into ** natural numbers**, which to some mean the

The ** integers** consist of the natural numbers (positive whole numbers and zero) combined with the negative whole numbers, which are symbolised by (from the German

A ** rational number** is a number that can be expressed as a

This is * quincunx*), a real-world device that can be used to illustrate the

- ...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 , such asGabriel'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

**Project pages**

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General | Foundations | Number theory | Discrete mathematics |
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Algebra | Analysis | Geometry and topology | Applied mathematics |

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