# Course talk:MATH600D 17/18-II

## Contents

exercise 1/25/2018018:02, 30 January 2018
Presentation 2001:31, 30 January 2018
Lectures for math 600108:05, 17 January 2018

## exercise 1/25/2018

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 $B$

18:02, 30 January 2018

## Presentation 2

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

SCN (talk)01:31, 30 January 2018

## Lectures for math 600

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 :)

16:15, 13 January 2018

I'd like to join you.

08:05, 17 January 2018