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A lantern lemma

Dan Margalit

math.GTarXiv:math/0206120

Abstract

We show that in the mapping class group of a surface any relation between Dehn twists of the form Txj Tyk = M (M a multitwist) is the lantern relation, and any relation of the form (Tx Ty)k = M (where Tx commutes with M) is the 2-chain relation.

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