Projection formula

In algebraic geometry, the projection formula states that, for a quasi-compact separated morphism of schemes $f:X \to Y$ , a quasi-coherent sheaf $\mathcal{F}$ on X, a locally free sheaf $\mathcal{E}$ on Y, the natural maps of sheaves

are isomorphisms.

There is yet another projection formula in the setting of étale cohomology.

单词	Projection formula
释义	Projection formula 英语百科 Projection formula In algebraic geometry, the projection formula states that, for a quasi-compact separated morphism of schemes $f:X \to Y$ , a quasi-coherent sheaf $\mathcal{F}$ on X, a locally free sheaf $\mathcal{E}$ on Y, the natural maps of sheaves are isomorphisms. There is yet another projection formula in the setting of étale cohomology.
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