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Abstract: Assume that $m\ge 2$ and let $l$ be a nonnegative integer with $l\ge m-4$.
Wegive an alternative proof of the fact that any smooth function defined locallyaround $0,0\in \mathbb{R}^2$ with the Taylor power series at $0,0$beginning with $$Rex+iy^m+0+

.+0$$ $l$ zeros is diffeomorphicallyequivalent to $Rex+iy^m$ at $0,0$.
For $m\ge 5$ and $C e 0$ we show thatthe function $$Rex+iy^m+Cx^2+y^2^{m-2}$$ is not diffeomorphicallyequivalent to $Rex+iy^m$ at $0,0$.



Autor: Evgeny Volkov

Fuente: https://arxiv.org/



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