Čech cohomology
![A Penrose triangle depicts a nontrivial element of the first cohomology of an annulus with values in the group of distances from the observer[1]](/Images/godic/202501/03/Penrose-dreieck.svg3930.png")
In mathematics, specifically algebraic topology, Čech cohomology is a cohomology theory based on the intersection properties of open covers of a topological space. It is named for the mathematician Eduard Čech.
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