RUS  ENG
Full version
JOURNALS // Matematicheskii Sbornik // Archive

Mat. Sb. (N.S.), 1975 Volume 97(139), Number 2(6), Pages 177–192 (Mi sm3647)

This article is cited in 9 papers

On an application of the multiple logarithmic residue to the expansion of implicit functions in power series

A. P. Yuzhakov


Abstract: By means of a multidimensional analog of the theorem of logarithmic residues, representations are found for the implicit functions $z_j=\varphi_j(w)$, $j=1,\dots,n$, defined by the system of equations
$$ F_j(w,z)=0,\qquad j=1,\dots,n, $$
where $w=(w_1,\dots,w_m)$, $z=(z_1,\dots,z_n)$, $F_j(0,0)=0$, and $\frac{\partial(F_1,\dots,F_n)}{\partial(z_1,\dots,z_n)}\big|_{(0,0)}\ne0,$ as also for the function $\Phi(w,z)=\Phi(w,\varphi(w))$, $\varphi=(\varphi_1,\dots,\varphi_n)$, where $F_1,\dots,F_n$ and $\Phi$ are holomorphic functions at $(0,0)\in\mathbf C_{(w,z)}^{m+n}$, in the form of power series and certain function series. In particular, a formula is obtained for the inverse of a holomorphic map in $\mathbf C^n$. One degenerate case is considered, where it is still possible to define single-valued branches of the implicit functions.
Bibliography: 16 titles.

UDC: 517.55+517.522

MSC: Primary 32A05, 32A25; Secondary 32B99

Received: 08.07.1974


 English version:
Mathematics of the USSR-Sbornik, 1975, 26:2, 165–179

Bibliographic databases:


© Steklov Math. Inst. of RAS, 2024