Bernoulli-Euler numbers and multiboundary singularities of type $B_n^l$

Details Bernoulli-Euler numbers and multiboundary singularities of type $B_n^l$ Bernoulli-Euler numbers and multiboundary singularities of type $B_n^l$

2009-10-21

arxiv.org/abs/0910.4046v1

Mathematics

Algebraic Geometry

11 pages

Scientific paper

In this paper we study properties of numbers $K_n^l$ of connected components of bifurcation diagrams for multiboundary singularities $B_n^l$. These numbers generalize classic Bernoulli-Euler numbers. We prove a recurrent relation on the numbers $K_n^l$. As it was known before, $K^1_n$ is $(n{+}1)$-th Bernoulli-Euler number, this gives us a necessary boundary condition to calculate $K_n^l$. We also find the generating functions for $K_n^l$ with small fixed $l$ and write partial differential equations for the general case. The recurrent relations lead to numerous relations between Bernoulli-Euler numbers. We show them in the last section of the paper.

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