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arXiv · 2401.09215

Topological properties of caustics in five-dimensional spaces

Vyacheslav D. Sedykh
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Abstract

We give a list of universal linear relations between the Euler characteristics of manifolds consisting of multisingularities of a generic Lagrangian map into a five-dimensional space. From these relations it follows, in particular, that the numbers $D_5A_2, A_4A_3, A_4A_2^2$ of isolated self-intersection points of the corresponding types on any generic compact four-dimensional caustic are even. The numbers $D_4^+A_3+D_4^-A_3+E_6$, $D_4^+A_2^2+D_4^-A_2^2+\frac12A_4A_3$ are even as well.

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Vyacheslav D. Sedykh. 2024-01-17. Topological properties of caustics in five-dimensional spaces. https://doi.org/10.4213/sm10131e

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