Sharpness for fusion systems
Sharpness for fusion systems
Let be a saturated fusion system on a finite -group . Write for the centric orbit category, whose objects are the -centric subgroups of , and consider, for each , the cohomology functor with trivial coefficients
Sharpness for fusion systems. For all and , the higher limits vanish:
This asserts that the subgroup decomposition of the classifying space of a saturated fusion system is sharp, generalizing the corresponding result for finite groups proved by Dwyer. The conjecture remains open in the general fusion-system setting.
Sources & referencesView supporting material
Primary source
Antonio Díaz and Sejong Park, “Mackey functors and sharpness for fusion systems”, arXiv:1211.3557 (2014).
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