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arxiv: 1401.0762 · v4 · pith:VHQZHVMZnew · submitted 2014-01-04 · 🧮 math.AG

Bifurcation values of polynomial functions and perverse sheaves

classification 🧮 math.AG
keywords bifurcationfunctionsperversepolynomialsheavesvaluescasescharacteristics
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We characterize bifurcation values of polynomial functions by using the theory of perverse sheaves and their vanishing cycles. In particular, by introducing a method to compute the jumps of the Euler characteristics with compact support of their fibers, we confirm the conjecture of N\'emethi-Zaharia in many cases.

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