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10 cards from this deck
nnn rows, mmm columns
Rows (then columns)
Must have same order
Multiply each element by the scalar
Columns in first = rows in second
No, in general AB≠BAAB \neq BAAB=BA
Swap rows and columns
BTATB^T A^TBTAT (order reverses)
All elements equal to zero
B×BB \times BB×B, NOT squaring each element
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