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Mathematics
About generating set of the invariant subalgebra of free restricted Lie algebra
V. M. Petrogradskya, I. A. Subbotinb a Department of Mathematics, University of Brasilia, 70910-900 Brasilia DF, Brazil
b Ulyanovsk State University, Russia, 432970, Ulyanovsk, ul. L'va Tolstogo, 42
Abstract:
Suppose that $L=L(X)$ is the free Lie p-algebra of finite rank $k$ with free generating set $X=\{x_1,\dots,x_k\}$ on a field of positive characteristic. Let $G$ is nontrivial finite group of homogeneous automorphisms $L(X)$. Our main purpose to prove that $L^G$ subalgebra of invariants is is infinitely generated. We have more strongly result. Let $Y=\cup_{n=1}^\infty Y_n$ be homogeneous free generating set for the algebra of invariants $L^G$, elements $Y_n$ are of degree $n$ relatively $X$, $n\ge1$. Consider the corresponding generating function $\mathscr H(Y,t)=\sum_{n=1}^\infty|Y_n|t^n$. In our case of free Lie restricted algebras, we prove, that series $\mathscr H(Y,t)$ has a radius of convergence $1/k$ and describe its growth at $t\to1/k-0$. As a result we obtain that the sequence $|Y_n|$, $n\ge1$, has exponential growth.
Key words:
free Lie algebras, Lie p-algebras, invariants, generating set.
Citation:
V. M. Petrogradsky, I. A. Subbotin, “About generating set of the invariant subalgebra of free restricted Lie algebra”, Izv. Saratov Univ. Math. Mech. Inform., 13:4(2) (2013), 93–98
Linking options:
https://www.mathnet.ru/eng/isu476 https://www.mathnet.ru/eng/isu/v13/i7/p93
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