On Fico's Lemmata and the Homotopy Type of Certain Gyrations

Abstract

We undertake to determine the homotopy type of gyrations of sphere products and of connected sums, thereby generalising results known in earlier literature as ''Fico's Lemmata'' which underpin gyrations in their original formulation from geometric topology. We provide applications arising from recasting these results into the modern homotopy theoretic setting.

17 pages, comments welcome. Typos fixed in this final version. To appear in Bulletin of the London Mathematical Society, with thanks to the anonymous referee