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10 cards from this deck
Rectangular arrays of numbers in rows and columns
iii is row number, jjj is column number
Matrix with only one row (1×n1 \times n1×n)
Matrix with only one column (m×1m \times 1m×1)
Same number of rows and columns (n×nn \times nn×n)
Matrices must have the same dimensions
Multiply every element of the matrix by the scalar
Left to right in first, top to bottom in second
No, generally AB≠BAAB \neq BAAB=BA
Inner dimensions must match
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