Abstract
If f is a Morse function on a smooth manifold M there exists a homotopy equivalence from M to a CW complex X such that the critical points of f with index λ are in a one-one correspondence to the λ-cells of X. In the equivariant case, a similar result holds for a special type of invariant Morse functions. In this paper we prove the existence of such special invariant Morse functions on compact smooth G-manifolds. As a consequence, any compact smooth G-manifold is homotopy equivalent to a G-CW complex. Other applications deal with the Euler number of the fixed point set and Morse inequalities in equivariant homology theory.
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Mayer, K.H. G-invariante Morse-funktionen. Manuscripta Math 63, 99–114 (1989). https://doi.org/10.1007/BF01173705
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DOI: https://doi.org/10.1007/BF01173705