MA4J8 Commutative Algebra II

2025 Lecture timetable

Mon 16:00 in MA B1.01 from Mon 6th Jan 2025
Thu 14:00 in MA B1.01
Fri 10:00 in MA B3.01
Support class: First session _Week 1_ Thu 9th Jan 13:00-14:00 in A1.01
with TA Marc Truter <Marc.Truter@warwick.ac.uk>

Partial lecture notes 2025

Crib-sheet "Frequently Forgotten Facts"
Dedekind domains and Prerequisites
Regular local rings, Artinian conditions

Example sheets

Preliminary worksheet on prerequisites
First worksheet with deadline Mon 27th Jan 2025 at 12:00 noon

Partial lecture notes 2024

2024 overall syllabus
2024 Lecture 1       Dedekind and Weber 1882
Chap 5 of course notes, Weeks 6-8
Chap 6 of course notes, Weeks 9-10
David Rees' 1956 paper on the Hauptidealsatz
Appendix: Overview of homological algebra
Appendix on injective modules

Alex Groutides' write-up of 2022-2023 lectures (with some new material)

Chapter 5: Koszul complex, regular sequence
Chapter 6: Depth, Cohen-Macaulay and Gorenstein
Appendix on Homological Algebra

2024 Worksheets

Worksheet_0 on prerequisites
Worksheet_1    Assignment deadline Mon 29th Jan at 12:00
Worksheet_2    Assignment deadline Mon 12th Feb at 12:00
Worksheet_3    Assignment deadline Mon 11th Mar at 12:00
Worksheet_4    Assignment deadline Mon 25th Mar at 12:00

Write-up of Autumn 2022 lectures by Alexandros Groutides

Chapter 5    Regular sequences, the Koszul complex and regular local rings
Chapter 6    Cohen-Macaulay and Gorenstein rings
Chapter 7    Appendix on homological algebra

Lecture notes from Autumn 2022

Week1
Week2
Week3
Weeks4-5
Week6   Lecture 17 Part I   Lecture 17 Part II   Lecture 18 Part I   Lecture 18 Part II

Last year's notes

The information below refers to the course given in 2021-22.

Plans My initial plans for the course

Lect 1 What is commutative algebra? [Sorry, no lecture capture.]
Lect 2 Dedekind domain, Existence of primes [Sorry, I forgot to
wear the microphone for first 45 minutes.]
More on DVRs Further discussion and exercises on Discrete valuation rings.
Lect 3 First ideas on Spec A and the Zariski topology
Lect 4-5 Varieties versus Spec A. Chain conditions
Lect 6 Finite length modules. An Artinian ring is Noetherian
Lectures 7-10. Completion and Hensel's Lemma
Lect 12-14 Dimension theory. Graded rings and modules and their Hilbert series
Lect 15-17 Hilbert-Samuel functions and the main theorem of dimension theory
Lect 18-22 Syzygies and regular sequences
Lect 25-29 Ext and depth - preliminary draft

Homework sheets

There will be 4 Assessed worksheets, with submission deadlines 12:00 noon on
   Week 3 Fri 22nd Oct
   Week 5 Fri 12th Nov
   Week 7 Fri 26th Nov
   Week 10 Fri 9th Dec
Example sheet 1    Questions 1,8 and 11 are assessed questions.
Solution to Q10
Example sheet 2
   Assessed questions from Example sheet 2
Example sheet 3
Example sheet 4

Additional resources

Schlichting and Bouyer's 2013 lecture notes