The maximal unipotent finite quotient, unusual torsion in Fano threefolds, and exceptional Enriques surfaces
We introduce and study the UNA TASSONOMIA DELLE DOMANDE DI ARGOMENTO LINGUISTICO NEI PORTALI DI DOMANDE E RISPOSTE maximal unipotent finite quotient for algebraic group schemes in positive characteristics.Applied to Picard schemes, this quotient encodes unusual torsion.We construct integral Fano threefolds where such unusual torsion actually appear