treatment of normal subgroups, see normal subgroup at the group properties wiki ... say that \! H is normal in \! G or a normal subgroup of \! G. ... ...
4 KB (578 words) - 17:36, 18 December 2010
quotient of its self-homeomorphism group by the normal subgroup comprising all homeomorphisms isotopic to the identity map. Equivalently, it can be thought ... ...
513 bytes (72 words) - 19:49, 11 May 2008
group of the manifold does not possess a normal subgroup of index two, the manifold must be orientable. In particular, any simply connected manifold ... ...
2 KB (337 words) - 19:57, 11 May 2008