A Hurewicz-type theorem for approximate fibrations

Author:

Coram D. S.,Duvall P. F.

Abstract

This paper concerns conditions on point inverses which insure that a mapping between locally compact, separable, metric ANR’s is an approximate fibration. Roughly a mapping is said to be π i {\pi _i} -movable [respectively, H i {H_i} -movable] provided that nearby fibers include isomorphically into mutual neighborhoods on π i {\pi _i} [resp. H i {H_i} ]. An earlier result along this line is that π i {\pi _i} -movability for all i implies that a mapping is an approximate fibration. The main result here is that for a U V 1 U{V^1} mapping, π i {\pi _i} -movability for i k 1 i \leqslant k - 1 plus H k {H_k} - and H k + 1 {H_{k + 1}} -movability imply π k {\pi _k} -movability of the mapping. Hence a U V 1 U{V^1} mapping which is H i {H_i} -movable for all i is an approximate fibration. Also, if a U V 1 U{V^1} mapping is π i {\pi _i} -movable for i k i \leqslant k and k is at least as large as the fundamental dimension of any point inverse, then it is an approximate fibration. Finally, a U V 1 U{V^1} mapping f : M m N n f:{M^m} \to {N^n} between manifolds is an approximate fibration provided that f is π i {\pi _i} -movable for all i max { m n , 1 2 ( m 1 ) } i \leqslant \max \{ m - n,\tfrac {1}{2}(m - 1)\} .

Publisher

American Mathematical Society (AMS)

Subject

Applied Mathematics,General Mathematics

Reference7 articles.

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