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Homotopy theory, homological algebra, algebraic treatments of manifolds.

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presentations of the trivial group

I just came across this statement in Bowditch's notes on geometric group theory that $\langle a,b\ |\ aba^{-1}b^{-2},a^{-2}b^{-1}ab \rangle$ is a presentation of the trivial group. Does anyone know if …
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