A secondary Chern-Euler class
Abstract
Let xi be a smooth oriented vector bundle, with n-dimensional fibre, over a smooth manifold M. Denote by xi-hat the fibrewise one-point compactification of xi. The main purpose of this paper is to define geometrically a canonical element Upsilon(xi) in Hn(xi-hat,Q) (Hn(xi-hat,Z) tensor 1/2, to be more precise). The element () is a secondary characteristic class to the Euler class in the fashion of Chern-Simons.
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