Relates abstract sheaf cohomology with Čech cohomology
In algebraic topology and algebraic geometry, Leray's theorem (so named after Jean Leray) relates abstract sheaf cohomology with Čech cohomology.
Let be a sheaf on a topological space and an open cover of If is acyclic on every finite intersection of elements of , then
where is the -th Čech cohomology group of with respect to the open cover