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13 cards from this deck
Rectangular arrangement of numbers in rows and columns
m×nm \times nm×n (m=rows, n=columns)
Number of rows
Number of columns
Square matrix showing connections in a graph/network
Vertices are connected
Lawn Tennis rule - read from left to top
Connections FROM that vertex
Connections TO that vertex
Always square (same number of rows and columns)
Symmetrical about the main diagonal
Number of walks of length nnn between vertices
No, AB≠BAAB \neq BAAB=BA in general
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