27 citations · 116 across the 31 of their papers we have counts for
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math.GR2014
Quasi-state Rigidity for Finite-dimensional Lie Algebras
Michael Björklund, Tobias Hartnick
We say that a Lie algebra $\gfr$ is quasi-state rigid if every Ad-invariant continuous Lie quasi-state on it is the directional derivative of a homogeneous quasimorphism. Extending…
math.GT2014
A note on semi-conjugacy for circle actions
Michelle Bucher, Roberto Frigerio, Tobias Hartnick
We define a notion of semi-conjugacy between orientation-preserving actions of a group on the circle, which for fixed point free actions coincides with a classical definition of Gh…
math.GR2014
On quasioutomorphism groups of free groups and their transitivity properties
Tobias Hartnick, Pascal Schweitzer
We introduce a notion of quasimorphism between two arbitrary groups, generalizing the classical notion of Ulam. We then define and study the category of homogeneous quasigroups, wh…