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This article is cited in 1 scientific paper (total in 1 paper)
The number of components of complements to level surfaces of partially harmonic polynomials
V. N. Karpushkin Institute for Information Transmission Problems, Russian Academy of Sciences
Abstract:
In this paper $k$-harmonic polynomials in $\mathbb R^n$ i.e. polynomials satisfying the Laplace equation with respect to $k$ variables: $(\partial^2/\partial x_1^2+\dots+\partial^2/\partial x_k^2)F=0$ are considered; here $1\le k\le n$, $n\ge2$. For a polynomial $F$ (of degree $m$) of this type, it is proved that the number of components of the complements of its level sets does not exceed $2m^{n-1}+O(m^{n-2})$. Under the assumptions that the singular set of the level surface is compact or that the leading homogeneous part of the $k$-harmonic polynomial $F$ is nondegenerate, sharper estimates are also established.
Received: 22.09.1995 Revised: 15.05.1997
Citation:
V. N. Karpushkin, “The number of components of complements to level surfaces of partially harmonic polynomials”, Mat. Zametki, 62:6 (1997), 831–835; Math. Notes, 62:6 (1997), 697–700
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https://www.mathnet.ru/eng/mzm1672https://doi.org/10.4213/mzm1672 https://www.mathnet.ru/eng/mzm/v62/i6/p831
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