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]

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.

单词	Cech cohomology
释义	Cech cohomology 英语百科 Čech cohomology 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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Cech cohomology

Čech cohomology