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Homology of the universal covering of a co-H-space
Authors:Norio Iwase   Shiroshi Saito   Toshio Sumi
Affiliation:Graduate School of Mathematics, Kyushu University, Ropponmatsu 4-2-1, Fukuoka 810, Japan ; Department of Mathematics, Shinshu University, Asahi 3-1-1, Matsumoto 390, Japan

Toshio Sumi ; Department of Art and Information Design, Kyushu Institute of Design, Shiobaru 4-9-1, Fukuoka 815, Japan

Abstract:The problem 10 posed by Tudor Ganea is known as the Ganea conjecture on a co-H-space, a space with co-H-structure. Many efforts are devoted to show the Ganea conjecture under additional assumptions on the given co-H-structure. In this paper, we show a homological property of co-H-spaces in a slightly general situation. As a corollary, we get the Ganea conjecture for spaces up to dimension 3.

Keywords:LS category   co-H-space   deck transformation
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