The bounded cohomology of SL₂ over local fields and S-integers
classification
🧮 math.GR
math.GT
keywords
boundedcohomologylocals-integersautomorphismsboundary-transitivecontinuousdegree
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It is proved that the continuous bounded cohomology of SL_2(k) vanishes in all positive degrees whenever k is a non-Archimedean local field. This holds more generally for boundary-transitive groups of tree automorphisms and implies low degree vanishing for SL_2 over S-integers.
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