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10 cards from this deck
Matrix containing only 0 and 1
Square matrix, one 1 per row/column, rest 0s
Rearrangement
Forming product PimesXP imes XPimesX (PPP comes first)
Forming product XimesPX imes PXimesP (PPP comes second)
P−1=PTP^{-1} = P^TP−1=PT (inverse equals transpose)
Square binary matrix showing direct links in network
Square the communication matrix (C2C^2C2)
Links where sender and receiver are same person
T=C+C2T = C + C^2T=C+C2
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