Monday, January 23, 2023 11:30 AM
Daniel Kim (Stanford)

Have you ever had a friend ask you what (co)homology is, and you ended up mumbling something about counting holes? In the first ten minutes, we will give a definition of cohomology that doesn't require you to know what a chain complex is. Using this definition, we will see how the ring structure shows up, and also construct Stiefel--Whitney classes.