Currently I’m reading the paper of Prof. Peter Teichner On the Signature of four-manifolds with universal covering spin, and I was stuck on the following passage: 539 more words
Tags » Cohomology
I’ve decided to start collecting here some random exercises arose during discussions with my colleagues (usually during the weekly pizza-time) and I found interesting.
Let be a continuous map between topological spaces, and some coefficients. 293 more words