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Multiplication of Crowns
(Instituto de Matematica de Bahia Blanca (INMABB-CONICET), 2013)
It is known that the only nite topological spaces that are H-spaces are the discrete spaces. For a nite poset which is weakly equivalent to an H-space, a generalized multiplication may be found after suitable ...
Generalizing the Hilton–Mislin genus group
(Elsevier, 2001)
For any group H, let H be the set of all isomorphism classes of groups K
such that K H . For a finitely generated group H having finite commu-
Ž .tator subgroup H, H , we define a group structure on H ...