On Verdier's specialization formula for Chern classes.
The normal cycle of a singular subset of a smooth manifold is a basic tool for understanding and computing the curvature of . If is replaced by a singular function on then there is a natural companion notion called the of , which has been introduced by the author and by R. Jerrard. We discuss a few fundamental facts and open problems about functions that admit gradient cycles, with particular attention to the first nontrivial dimension .
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