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 23:30, July 13, 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.