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10 cards from this deck
Columns in 1st must equal rows in 2nd
m×pm \times pm×p
Not commutative; generally AB≠BAAB \neq BAAB=BA
1s on diagonal, 0s elsewhere (square matrix)
AI=A=IAAI = A = IAAI=A=IA
A×AA \times AA×A
Only square matrices
Run along rows of 1st, dive down columns of 2nd
Rows from 1st matrix with columns from 2nd
A×BA \times BA×B or ABABAB
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