23 citations · 79 across the 26 of their papers we have counts for
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math.GR2008
Automorphic orbits in free groups: words versus subgroups
Pedro Silva, Pascal Weil
We show that the following problems are decidable in a rank 2 free group F_2: does a given finitely generated subgroup H contain primitive elements? and does H meet the orbit of a…
math.GR2008
On finite-index extensions of subgroups of free groups
Pedro Silva, Pascal Weil
We study the lattice of finite-index extensions of a given finitely generated subgroup of a free group . This lattice is finite and we give a combinatorial characterization…