identity mat-rices

identity matrix

noun Mathematics.
a matrix that has 1 in each position on the main diagonal and 0 in all other positions.

1940–45 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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identity matrix

a scalar matrix in which all of the diagonal elements are unity 
WordNet® 3.0, © 2006 by Princeton University.
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