- orientation-reversing
- мат.обращающий ориентацию
English-Russian scientific dictionary. 2008.
English-Russian scientific dictionary. 2008.
Orientation character — In algebraic topology, a branch of mathematics, an orientation character on a group π is a group homomorphism . This notion is of particular significance in surgery theory. Contents 1 Motivation 2 … Wikipedia
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Hurwitz's automorphisms theorem — In mathematics, Hurwitz s automorphisms theorem bounds the group of automorphisms, via orientation preserving conformal mappings, of a compact Riemann surface of genus g > 1, telling us that the order of the group of such automorphisms is bounded … Wikipedia