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Diastolic and isoperimetric inequalities on surfaces

Florent BalacheffStéphane Sabourau — 2010

Annales scientifiques de l'École Normale Supérieure

We prove a universal inequality between the diastole, defined using a minimax process on the one-cycle space, and the area of closed Riemannian surfaces. Roughly speaking, we show that any closed Riemannian surface can be swept out by a family of multi-loops whose lengths are bounded in terms of the area of the surface. This diastolic inequality, which relies on an upper bound on Cheeger’s constant, yields an effective process to find short closed geodesics on the two-sphere, for instance. We deduce...

Systolic invariants of groups and 2 -complexes via Grushko decomposition

Yuli B. RudyakStéphane Sabourau — 2008

Annales de l’institut Fourier

We prove a finiteness result for the systolic area of groups. Namely, we show that there are only finitely many possible unfree factors of fundamental groups of  2 -complexes whose systolic area is uniformly bounded. We also show that the number of freely indecomposable such groups grows at least exponentially with the bound on the systolic area. Furthermore, we prove a uniform systolic inequality for all 2 -complexes with unfree fundamental group that improves the previously known bounds in this dimension....

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