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JOURNALS // Vestnik Tomskogo Gosudarstvennogo Universiteta. Matematika i Mekhanika // Archive

Vestn. Tomsk. Gos. Univ. Mat. Mekh., 2019 Number 58, Pages 32–40 (Mi vtgu697)

MATHEMATICS

Canonical system of basic invariants for unitary group $W(K_5)$

O. I. Rudnitskii

Vernadsky Crimean Federal University, Simferopol, Russian Federation

Abstract: For a finite group $G$ generated by reflections in the $n$-dimensional unitary space $U^n$, the algebra $I^G$ of all $G$-invariant polynomials $f(x_1,\dots,x_n)$ is generated by $n$ algebraically independent homogeneous polynomials $f_i\in I^G$ with $\mathrm{deg}\,f_i=m_i$ ($i=\overline{1,n}$); $m_1\leqslant m_2\leqslant\dots\leqslant m_n$ (Shephard G. C., Todd J. A.).
According to Nakashima N., Terao H., and Tsujie S., system $\{f_1,\dots, f_n\}$ of basic invariants of the group $G$ is said to be canonical if it satisfies the following system of partial differential equations:
$$ \overline{f}_i(\partial) f_j=0,\quad i,j=\overline{1,n}\ (i<j), $$
where the differential operator $\overline{f}_i(\partial)$ is obtained from polynomial $f_i$ if each its coefficient is replaced by the complex conjugate and each variable $x_k$ is replaced by $\frac\partial{\partial x_k}$.
In the previous works, the author obtained in an explicit form canonical systems of basic invariants for all finite primitive unitary groups $G$ generated by reflections in unitary spaces of dimensional $2$$3$, and $4$.
In this paper, canonical systems of basic invariants were constructed in an explicit form for unitary groups $W(K_5)$ generated by reflections in space $U^5$.

Keywords: Unitary space, reflection, reflection groups, algebra of invariants, basic invariant, canonical system of basic invariants.

UDC: 514.7

MSC: 51F15; 14L24

Received: 04.12.2018

DOI: 10.17223/19988621/58/3



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