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thom polynomial

Proceedings of the London Mathematical Society (1)

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Thom Polynomials for Lagrange, Legendre, and Critical Point Function Singularities
Maxim Kazarian
Journal:

Proceedings of the London Mathematical Society / Volume 86 / Issue 3 / May 2003

Published online by Cambridge University Press:

09 June 2003, pp. 707-734

Print publication:

May 2003
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The definition of Thom polynomials for Lagrange, Legendre and critical point function singularities is given. The approach is based on the notion of classifying space of singularities. This approach provides a universal method for computing Thom polynomials. Characteristic classes of complex Lagrange and Legendre singularities of small codimension are computed. Two independent methods for these computations are presented. The first is the direct one based on the resolution of singularities, the Gysin homomorphism, and the notion of adjacency exponents. The second uses the existence theorem for Thom polynomials and is based on Rimányi's idea of using symmetries. The expressions for the resulting polynomials reduced modulo 2 agree with those obtained by Vassiliev for the real case.