Abstract Algebra: Integers modulo n

Introduction (0:00)
Integers modulo n (0:07)
Addition and multiplication modulo n (1:24)
Additive group of integers modulo n (5:06)
Multiplicative group of integers modulo n (12:06)
Examples (16:13)
More about primitive residue classes (22:41)
Computing inverses modulo n (26:03)
Division modulo n (28:09)
Theorem: solutions to ax=b mod n (32:18)
Example (33:16)