Abstract Algebra 77: Subrings
Abstract: We introduce subrings of a ring, and draw a diagram containing only some of the subrings of the complex numbers. We also explain how the ring of all 2x2 matrices has as a (commutative) subring the collection of all diagonal matrices.
This video accompanies the class "Introduction to Abstract Algebra" at Colorado State University:
https://www.math.colostate.edu/~adams/teaching/math366spr2021/
