Projection formula

In algebraic geometry, the projection formula states that,[1][2] for a quasi-compact separated morphism of schemes , a quasi-coherent sheaf on X, a locally free sheaf on Y, the natural maps of sheaves

are isomorphisms.

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

See also


Hartshorne, Robin (1977), Algebraic Geometry, Graduate Texts in Mathematics, 52, New York: Springer-Verlag, ISBN 978-0-387-90244-9, MR 0463157

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