Free subgroups in k(x(1), ... , x(n))(X; sigma) and k(x, y)(X; sigma)

Goncalves, JZ

Goncalves, JZ (reprint author), Univ Sao Paulo, Dept Math, BR-05508090 Sao Paulo, Brazil.

FORUM MATHEMATICUM, 2019; 31 (3): 769

Abstract

Let k be a field, let A1 be the k-algebra k[x(1)(+/- 1),..., x(s)(+/- 1)] of Laurent polynomials in x(1),..., x(s), and let A2 be the k-algebra k[x, y......

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