Szego Seminar: Čech cohomology without (too many) tears

Abstract: Čech cohomology is a cohomology theory based on the intersection properties of open covers of a topological space. Unfortunately, Since it has been long adopted by algebraic geometers (i.e. fans of abstract nonsense and German-style letters) to approximate sheaf cohomology,  reading current literature to appreciate its beauty is as hard as admiring cats through bathing them. However, the speaker of this talk still holds on to the faith of advertising this cohomology even to the haters of algebra.

To make it happen, I will do minimal diagram chasing and make mentioning "scheme" a taboo in this talk, but instead introducing more motivating examples, geometric properties, and one very intriguing application developed by Roger Penrose: to study the impossibilities of Escherian impossible figures!