Hopf invariant one, part II: cohomology operations and vector fields on spheres
Sanath Devalapurkar
Let’s begin by talking about cohomology operations. Cohomology Operations I will state a few definitions and results now, and explain their significance in a bit. Definition: Let and be cohomology theories. A cohomology operation of “type and degree ” is a natural transformation . A stable cohomology operation of degree is a collection of homomorphisms […]