How to show $\langle x,y \mid x^3=y^3=(xy)^3=1 \rangle$ is presentation of an infinite group?
This is a result in textbook, but I do not understand the rationale.
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What was the given rationale that you do not understand? – Sep 13 '16 at 14:37
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3Also this question is already here. – Sep 13 '16 at 14:44