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→Topology: Spelling/Grammar Check & Cleanup
The [[genus]] of a one-fold torus is 1.
The [[genus]] of a one-fold torus is 1.
Unusually, it is possible to divide a torus into seven different colored areas such that each area borders the other six. This is not possible on a flat surface or a [[sphere]], where the maximum number of areas that can all touch each other is four<ref>[http://faculty.smcm.edu/sgoldstine/torus7.html Seven-color tori]</ref>.
Unusually, it is possible to divide a torus into seven different colored areas such that each area borders the other six. This is not possible on a flat surface or a [[sphere]], where the maximum number of areas that can all touch each other is four.<ref>[http://faculty.smcm.edu/sgoldstine/torus7.html Seven-color tori]</ref>
==References==
==References==
<references/>
<references/>
[[Category:Geometry]]
[[Category:Geometry]]