The evaluation subgroup of a fibre inclusion

Details The evaluation subgroup of a fibre inclusion The evaluation subgroup of a fibre inclusion

2006-08-23

arxiv.org/abs/math/0608582v2

Mathematics

Algebraic Topology

15 pages

Scientific paper

Given a fibration of simply connected CW complexes of finite type, we study the evaluation subgroup of the fibre inclusion as an invariant of fibre-homotopy type. For spherical fibrations, we show the evaluation subgroup may be expressed as an extension of the Gottlieb group of the fibre sphere provided the classifying map induces the trivial map on homotopy groups. We extend this result after rationalization: We show that the rationalized evaluation subgroup of the fibre inclusion decomposes as the direct sum of the rationalized Gottlieb group of the fibre and the rationalized homotopy group of the base if and only if the classifying map induces the trivial map on rational homotopy groups.

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