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2 votes
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Finite flat pullback of the diagonal

Let $X, Y$ be smooth projective connected complex varieties of the same pure dimension $d$ and $f : X\to Y$ a finite flat surjective morphism. Let $\Delta_X$ be the closed subscheme of $X\times X$ ...
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2 votes
1 answer
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Lefschetz standard conjecture under specialization/generization

Let $S$ be a smooth connected noetherian scheme (not necessarily over a field) with residue fields that are all of finite type over their prime field. Let $f: \mathcal{X}\to S$ be a smooth projective ...
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