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Fundamental polygon
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Fundamental polygon : ウィキペディア英語版
Fundamental polygon
In mathematics, each closed surface in the sense of geometric topology can be constructed from an even-sided oriented polygon, called a fundamental polygon, by pairwise identification of its edges.
This construction can be represented as a string of length 2''n'' of ''n'' distinct symbols where each symbol appears twice with exponent either +1 or −1. The exponent −1 signifies that the corresponding edge has the orientation opposing the one of the fundamental polygon.〔Alan F. Beardon, ''The Geometry of Discrete Groups'' (1983), Springer-Verlag, New York. ISBN 0-387-90788-2.〕〔Hershel M. Farkas and Irwin Kra, ''Riemann Surfaces'' (1980), Springer-Verlag, New York. ISBN 0-387-90465-4.〕〔Jurgen Jost, ''Compact Riemann Surfaces'' (2002), Springer-Verlag, New York. ISBN 3-540-43299-X.〕
==Examples==

* Sphere: A A^ or A B B^ A^
* Real projective plane: A A or A B A B
* Klein bottle: A B A B^ or A A B B
* Torus: A B A^ B^ or A B C A^ B^ C^

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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