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HJRW
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Subgroups of a group generated by a free semigroup
Oh, right. As Greg points out, this doesn't work. Wow, there's a big difference between groups and semigroups!
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decidability of group homomorphism existence
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Subgroups of a group generated by a free semigroup
Added a comment on Richard's idea.
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Subgroups of a group generated by a free semigroup
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