# Difference between revisions of "Genus"

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In [[biology]], a genus is a grouping in the [[Linnaean taxonomy]] of living things which includes one or more related species. | In [[biology]], a genus is a grouping in the [[Linnaean taxonomy]] of living things which includes one or more related species. | ||

− | In [[topology]], a genus of a surface is the greatest number of distinct, continuous closed curves that may be drawn on it without separating the surface into distinct regions. The closed curves cannot be self-intersecting. The genus of the surface of a sphere is 0, while the genus of a | + | In [[topology]], a genus of a surface is the greatest number of distinct, continuous closed curves that may be drawn on it without separating the surface into distinct regions. The closed curves cannot be self-intersecting. The genus of the surface of a sphere is 0, while the genus of a doughnut shape is 1. |

[[category:biology]] | [[category:biology]] | ||

[[category:mathematics]] | [[category:mathematics]] |

## Revision as of 18:30, 13 July 2007

In biology, a genus is a grouping in the Linnaean taxonomy of living things which includes one or more related species.

In topology, a genus of a surface is the greatest number of distinct, continuous closed curves that may be drawn on it without separating the surface into distinct regions. The closed curves cannot be self-intersecting. The genus of the surface of a sphere is 0, while the genus of a doughnut shape is 1.