Groups, Rings, and Fields: Math 620, Fall 2026
Schedule



Day Topics Reading
Tu. 8/25 The Integers [OS] Sec. 1.1,2
Th. 8/27 Exercises on properties of the integers. [OS] Sec. 1.1,2
Tu. 9/1 Groups, subgroups and homomorphisms. [OS] Sec. 2.1,2,3
Th. 9/3 Exercises on groups. [OS] Sec. 1.2, 2.1,2,3
Tu. 9/8 Direct Products, Automorphism groups, permutation groups.
The symmetric group.
[OS] Sec. 2.3,4,5
Th. 9/10 Exercises: Lattices of subgroups, automorphism groups
permutation groups.
[OS] Sec. 2.3,4,5
Tu. 9/15 Parity of a permutation, the alternating group.
Cayley's theorem.
Cosets and conjugates.
[OS] Sec. 2.5, 2.7
Th. 9/17 Exercises: Alternating group, Cayley's theorem.
Conjugation and inner automorphims.
[OS] Sec. 2.5, 2.6, 2.7
Tu. 9/22 Normality and the first isomorphism/factor theorem.
Matrix groups and other constructions.
[OS] Sec. 2.6, 2.8, 2.9
Th. 9/24 Exercises: normal subgroups. Dicyclic groups on other groups, lattice diagrams. [OS] Sec. 2.6, 2.8
Tu. 9/29 The third isomorphism theorem and correspondence theorem.
Matrix groups
Classfication of Finite Abelian Groups.
Other abelian groups
[OS] Sec 2.9, 2.10, 3.1.
Th. 10/1 Exercises: matrix groups.
Finite abelian groups. Other abelian groups.
[OS] Sec. 2.9, 2.10, 3.1
Tu. 10/6 Other group constructions.
Group actions.
[OS] Sec. 2.9.
Th 10/8 Test 1. Fundamentals of group theory.
Abelian groups.
[OS] Ch 2, 3.1.
Tu 10/13 The second isomorphism theorem and semidirect product.
Classification of finite groups.
Simple groups. A_n is simple.
[OS] Sec. 3.3.
Th 10/15 Exercises: Semi-direct products
Classification of groups.
[OS] Sec. 2.9, 3.2, 3.3.
Tu 10/20 Rings and homomorphisms.
Units, zero divisors, nilpotents. F[x].
Direct products, polynomial rings.
[OS] Sec. 4.1, 4.2, 4.3
Th. 10/22 Exercises: Homomorphisms, isomorphisms. Universal property of R[x].
Evaluation of a polynomial.
[OS] Sec. 4.1, 4.2, 4.3
Tu. 10/27 Ideals and quotient rings. Isomorphism theorems. [OS] Sec. 4.4, 4.5