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math.AG2020
Cohomological invariants of root stacks and admissible double coverings
Andrea Di Lorenzo, Roberto Pirisi
We give a formula for the cohomological invariants of a root stack, which we apply to compute the cohomological invariants and the Brauer group of the stack of admissible double co…
math.AG2020
Brauer groups of moduli of hyperelliptic curves via cohomological invariants
Andrea Di Lorenzo, Roberto Pirisi
We compute the Brauer group of the moduli stack of hyperelliptic curves over any field of characteristic zero. In positive characteristic, we compute the part of th…