Explicit construction of irreducible symplectic fourfolds with b2=4 and non-quotient singularities via terminalisations of hyper-Kähler quotients by non-natural group actions.
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A symplectic fourfold
Explicit construction of irreducible symplectic fourfolds with b2=4 and non-quotient singularities via terminalisations of hyper-Kähler quotients by non-natural group actions.