The Schur multiplier of F/[R, S]

Joseph Abarbanel, Shmuel Rosset*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


It is known that if F is a free group and R is a normal subgroup such that F/R is an infinite group, then the Schur multiplier of F/γc(R) is not finitely generated for all c>1. It is an interesting question, if R, S are two normal subgroups of the free group F, when F/[R, S] is finitely presented, and when is its Schur multiplier finitely generated. We show for most cases (including the cases already known) that if F/RS is infinite then the Schur multiplier of F/[R, S] is not finitely generated. We believe this is true in general. On the other hand if R, S are normally finitely generated and RS is of finite index, then F/[R, S] is finitely presented.

Original languageEnglish
Pages (from-to)1-8
Number of pages8
JournalJournal of Pure and Applied Algebra
Issue number1-3
StatePublished - 1 Jun 2005


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