Course talk:MATH600D 17/18-II

hi regarding the exercise last time : $\bigvee \sigma (P) + \bigvee \sigma(P') = B$, where P, P' are defined as maximal ideals of the integral closure of B. $\sigma$ is the automorphism of $B$.

by prop1.11(b) of atiyah mcdonald , $\bigvee \sigma (P)$ and $\bigvee \sigma(P') $ are maxima ideals. by assumption in notes that P and P' are in different orbits, it follows that sum of 2 different maximal ideals is the whole ring $B$

Prajeet and I would like to present the second set of topics. Let us know if that's ok.

Hey folks I'd love to give the lecture on " projective and flat modules , noetherian ring ".  If anyone wants to do this topic too,  we can split and do it together :)

I'd like to join you.