Sets & Matrices

What you'll learn

Set notation and Venn-diagram counting, plus matrix addition, scalar multiplication, and the matrix product.

• A set is a well-defined collection, written with notation
• Union combines, intersection overlaps
• The complement is everything outside the set
• The addition rule counts a union without double-counting the overlap
• A matrix is a rectangular array; only matrices of the SAME order can be added or subtracted
• The matrix product is row-by-column, not entry-by-entry