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Consortium of Swiss Academic Libraries

Equivalences between blocks of cohomological Mackey algebras

Rognerud, Baptiste

In: Mathematische Zeitschrift, 2015, vol. 280, no. 1-2, p. 421-449

Consortium of Swiss Academic Libraries

The μ-ordinary Hasse invariant of\break unitary Shimura varieties

Goldring, Wushi ; Nicole, Marc-Hubert

In: Journal für die reine und angewandte Mathematik (Crelles Journal), 2017, vol. 2017, no. 728, p. 137-151

Consortium of Swiss Academic Libraries

AUTOMORPHISMS OF CLUSTER ALGEBRAS OF RANK 2

BLANC, JÉRÉMY ; DOLGACHEV, IGOR

In: Transformation Groups, 2015, vol. 20, no. 1, p. 1-20

Consortium of Swiss Academic Libraries

Invariants and separating morphisms for algebraic group actions

Dufresne, Emilie ; Kraft, Hanspeter

In: Mathematische Zeitschrift, 2015, vol. 280, no. 1-2, p. 231-255

Université de Fribourg

Dehn functions and Hölder extensions in asymptotic cones

Lytchak, Alexander ; Wenger, Stefan ; Young, Robert

In: Journal für die reine und angewandte Mathematik, 2020, vol. 2020, no. 763, p. 79–109

The Dehn function measures the area of minimal discs that fill closed curves in a space; it is an important invariant in analysis, geometry, and geometric group theory. There are several equivalent ways to define the Dehn function, varying according to the type of disc used. In this paper, we introduce a new definition of the Dehn function and use it to prove several theorems. First, we...

Université de Fribourg

Minimal pseudo-Anosov stretch factors on nonoriented surfaces

Liechti, Livio ; Strenner, Balázs

In: Algebraic & Geometric Topology, 2020, vol. 20, no. 1, p. 451–485

We determine the smallest stretch factor among pseudo-Anosov maps with an orientable invariant foliation on the closed nonorientable surfaces of genus 4, 5, 6, 7, 8, 10, 12, 14, 16, 18 and 20. We also determine the smallest stretch factor of an orientation-reversing pseudo-Anosov map with orientable invariant foliations on the closed orientable surfaces of genus 1, 3, 5, 7, 9 and 11. As a ...

Université de Fribourg

On the quasi-isometric and bi-Lipschitz classification of 3D Riemannian Lie groups

Fässler, Katrin ; Donne, Enrico Le

In: Geometriae Dedicata, 2020, p. -

This note is concerned with the geometric classification of connected Lie groups of dimension three or less, endowed with left-invariant Riemannian metrics. On the one hand, assembling results from the literature, we give a review of the complete classification of such groups up to quasi-isometries and we compare the quasi- isometric classification with the bi-Lipschitz classification. On the...

Consortium of Swiss Academic Libraries

Filtered Hopf algebras and counting geodesic chords

Frauenfelder, Urs ; Schlenk, Felix

In: Mathematische Annalen, 2014, vol. 360, no. 3-4, p. 995-1020