Some cup products
I made some notes on the cup product structure in the cohomology of the torus T = M_1 and the projective plane RP^2 = N_1. These are a little simpler than Hatcher's treatment of the general surfaces M_g and N_h.
Published Sep. 11, 2026 9:44 PM
- Last modified Sep. 11, 2026 9:44 PM