A recursive presentation for Mihailova's subgroup

Details A recursive presentation for Mihailova's subgroup A recursive presentation for Mihailova's subgroup

2008-10-03

arxiv.org/abs/0810.0690v1

Mathematics

Group Theory

9 pages

Scientific paper

We give an explicit recursive presentation for Mihailova's subgroup $M(H)$ of $F_n \times F_n$ corresponding to a finite, concise and Peiffer aspherical presentation $H=< x_1,..., x_n \mid R_1,..., R_m>$. This partially answers a question of R.I. Grigorchuk, [8, Problem 4.14]. As a corollary, we construct a finitely generated recursively presented orbit undecidable subgroup of $Aut(F_3)$.

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