"Numerical measures of singularity" by Javid Validashti
 

Document Type

Lecture

Publication Date

10-24-2014

Abstract

The theory of multiplicities is ubiquitous in algebra. For instance, due to the seminal work of Rees in the 1960s, Hilbert-Samuel multiplicity plays a fundamental role in the theory of integral dependence of ideals. Multiplicity theory is widespread in geometry as well, particularly in equisingularity theory, influenced by Whitney in the 1950s, followed by Zariski, Thom, Mather, Teissier, Kleiman, Thorup, and Gaffney. The idea is to understand how topological similarity in a family of singularities is captured by various algebraic properties and invariants. In this talk, I will survey classical results and discuss new developments that enable exploration of more complex singularities.

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