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row matrix
one horizontal row
2x2 matrix
2 rows and 2 columns
det(2x2)
ad - bc
matrix
an array of numbers
column
vertical
row
horizontal
(2,5)
row 2 and column 5
identity
1's on main diagonal
rref
row-reduced echelon form
the product of a matrix and its inverse
the identity matrix
square matrix
equal number of rows and columns
the product of a 2x3 matrix and a 3x4 matrix is ...
a 2x4 matrix
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