
noun:
 A square matrix with 1's over the diagonal from top remaining to reduce right and 0's in every various other roles.
 A diagonal matrix the diagonal elements of which are add up to 1.
 a scalar matrix in which most of the diagonal elements tend to be unity

Definition for "identity matrix"
 A square matrix with 1's over the diagonal…
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Synonym for "identity matrix"
 unit matrix
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Hypernym for "identity matrix"
 scalar matrix
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How would you define identity matrix?