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Questions about the branch of algebra that deals with groups.

4 votes
1 answer
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Extending primitive systems in free groups

It is a version of a question I asked on Math.StackExchange (no answers yet). Suppose $a_1,a_2,\ldots,a_n,b$ is a primitive system in a non-abelian free group $F$ (a part of a basis of $F$). Let $c \i …