Essential manifolds
Definition of essential manifolds, lens spaces as example of non-aspherical essential manifolds.
mathematics and other sciences, useful software and some philosophy
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Definition of essential manifolds, lens spaces as example of non-aspherical essential manifolds.
Aspherical manifolds, Eilenberg-MacLane spaces, classifying spaces of groups via the nerve construction.
Diplomarbeit von Konrad Völkel (auf deutsch).
I want to explain briefly the idea behind AQFT in the Haag-Kastler style and explain why we could model physics like that.
http://blog.konradvoelkel.de/2011/08/essential-manifolds/