Math 122
Modules and Group Representations

Course Information

Lecture: Monday, Wednesday, Friday 10:30am–11:20am
Building 380 (Sloan Hall), Room 380-D (Basement Floor)

Course Webpage:
Grades will be made available through Coursework.

2015 Course Webpage:

Textbook: Dummit–Foote, Abstract Algebra
Suggested Reading: Fulton–Harris, Representation Theory (pdf at SpringerLink)

Professor: Jenny Wilson
Office Hours: Wednesdays 12–1:30pm & Thursdays 2:30–4pm
Building 380 (Sloan Hall), Room 382-H (Second Floor, Room H)

Course Assistant: Adva Wolf
Email: advaw "at"
Office Hours: Wednesdays 5–6:30pm & Thursdays 5–6:30pm
Building 380 (Sloan Hall), Room 381-J (First Floor, Room J)

Course Description: Modules over PID. Tensor algebra. Group representations and group rings. Maschke's theorem and character theory. Character tables, construction of representations. Prerequisite: Math 120. Also recommended: 113.

Syllabus: We will follow Dummit & Foote Chapters 10, 12, 18, and parts of 19 as time permits.

Grading Scheme:
Homework    50%
Midterm I 15%
Midterm II 15%
Final 20%

Students with documented disabilities: Students who may need an academic accommodation based on the impact of a disability must initiate the request with the Office of Accessible Education (OAE). Professional staff will evaluate the request with required documentation, recommend reasonable accommodations, and prepare an Accommodation Letter for faculty dated in the current quarter in which the request is made. Students should contact the OAE as soon as possible since timely notice is needed to coordinate accommodations. The OAE is located at 563 Salvatierra Walk (723-1066,

Homework policy: Homework assignments will be posted to the course webpage. Homework is due Fridays, and collected at the beginning of lecture. Late homework is generally not accepted except under extenuating circumstances. Your homework solutions should be neat, legible, and stapled . You may work in groups and discuss homework problems with other students, but your solutions must be written up independently and in your own words.

Each student's lowest homework score will be dropped.

You are welcome to use other texts and online resources to review the mathematical theory and computational techniques we cover. You may not, however, seek out solutions to specific homework problems. Outside sources should be used to improve your understanding of the material, not as a shortcut to finish assignments with an incomplete understanding. Use your discretion.

You are encouraged to discuss the homework with classmates and work on difficult problems in groups. You must, however, write your own homework solutions, and you are responsible for understanding what you've written. The homework is your foremost resource for practice with the course material, and for feedback on your work. Doing the homework thoughtfully is essential to your success in this class.

Honour Code: The Stanford Honour Code is available through Stanford's Office of Community Standards.


Homework 1 Due: Friday 1 April 2016           
Before Week 2, please complete the (anonymous) entrance survey.
Homework 2 Due: Friday 8 April 2016           
Homework 3 Due: Friday 15 April 2016           
Homework 4 Due: Friday 22 April 2016           
Homework 5 Due: Friday 29 April 2016           
Homework 6 Due: Friday 6 May 2016           
Homework 7 Due: Friday 13 May 2016           
Homework 8 Due: Friday 20 May 2016           
Homework 9 Due: Friday 27 May 2016           
Homework 10 Due: Wednesday 1 June 2016 (by 5pm)           


The course will have two closed-book midterm exams, in class on Wednesday 27 April (Week 5) and Wednesday 25 May (Week 9).

These exams will take place in our usual classroom at the usual class time. You will have 50 minutes. No books, notes, calculators, cell phones, or other electronic aids are permitted.

Midterm I will cover material up to the end of Week 4. Review questions are available here:

Midterm I Review           

The midterm and solutions are available here:

Midterm I Solutions           

Midterm II will cover material up to the end of Week 8. Review questions are available here:

Midterm II Review           

The midterm and solutions are available here:

Midterm II Solutions           

Your take-home final exams have now been distributed. The exams are due at 5pm on Wednesday 8 June. Submission instructions are printed at the end of the exam.

Outside Reading

The following reading is strictly optional: it is not related to the course material and will not be discussed in the course. These are articles on math education and learning psychology which may be of interest to math students.

Dweck - Beliefs about intelligence (

Kimball and Smith - The myth of 'I'm bad at math' (The Atlantic)

Tough - Who gets to graduate (New York Times Magazine)

Paul - How to be a better test-taker (New York Times)

Boaler - Timed tests and the development of math anxiety (Education Week)

Parker - Learn math without fear (Stanford Report)

Steele - Thin ice: stereotype threat and black college students (The Atlantic)

Vedantam - How stereotypes can drive women to quit science (NPR)

Stroessner and Good - Stereotype threat: an overview (University of Arizona)

Lockhart - A mathematician's lament (Mathematical Association of America)

Duchin - The sexual politics of genius (Tufts University)

Webpage design by Andreas Viklund