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December 10, 2022#4.11 topological open (resp. closed) immersiontopological open (resp. closed) immersion2 minPlay
December 10, 2022#4.9 α is an isomorphism if and only if α_x is any x in Xα is an isomorphism if and only if α_x is any x in X1 minPlay
December 10, 2022#4.8 (X,O_X) onto (V,O_Y|V)(X,O_X) onto (V,O_Y|V); open immersion another def3 minPlay