Stephan Stadler

activity

20132026

most citedMetric minimizing surfaces revisited

11 citations · 17 across the 8 of their papers we have counts for

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Showing 2022 · math.MGShow all

2 papers · 2 filters

math.MG2022

Rank Rigidity for CAT(0) spaces without 3-flats

Stephan Stadler

If a group $Γ$ acts geometrically on a CAT(0) space $X$ without 3-flats, then either $X$ contains a $Γ$ -periodic geodesic which does not bound a flat half-plane, or else $X$ is a r…

math.MG2022

CAT(0) spaces of higher rank I

Stephan Stadler

A CAT(0) space has rank at least $n$ if every geodesic lies in an $n$ -flat. Ballmann's Higher Rank Rigidity Conjecture predicts that a CAT(0) space of rank at least $2$ with a geom…