3 papers
math.GR2004
A simple proof of a theorem of Karrass and Solitar
Delaram Kahrobaei
In this note we give a particularly short and simple proof of the following theorem of Karrass and Solitar. Let be a finitely generated subgroup of a free group with infini…
math.GR2004
The Amalgamated product of free groups and residual solvability
Delaram Kahrobaei
In this paper we study residual solvability of the amalgamated product of two finitely generated free groups, in the case of doubles. We find conditions where this kind of structur…
math.GR2002
A new proof of a theorem of Ivanov and Schupp
Delaram Kahrobaei
The object of this note is to give a very short proof of the following theorem of Ivanov and Schupp. Let H be a finitely generated subgroup of a free group F and the index [F:H] in…