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matrix
a rectangular arrangement of numbers
dimensions of a matrix
m rows and n columns; m × n (read "m by n")
elements
the numbers in a matrix
scalar
a real number
scalar multiplication
to multiply a matrix by a scalar, multiply each element in the matrix by the scalar
Cramer's Rule
using determinants to solve a system of linear equations
identity matrix
a matrix with ones for all elements on the main diagonal (top left to bottom right) and zeros for all the other elements
inverse matrices
two n x n matrices A and B whose product is the n x n identity matrix; AB = I and BA = I
Note 
Flashcard (20)