The quadratic isoperimetric inequality for mapping tori of free group automorphisms I: Positive automorphisms
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If $F$ is a finitely generated free group and $ϕ$ is a positive automorphism of $F$ then $F\rtimes_ϕZ$ satisfies a quadratic isoperimetric inequality.
69 pages, 32 figures. Improved proof of the Pincer Lemma
69 pages, 32 figures. Improved proof of the Pincer Lemma