from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A square matrix with 1's along the diagonal from upper left to lower right and 0's in all other positions.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A diagonal matrix all of the diagonal elements of which are equal to 1.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a scalar matrix in which all of the diagonal elements are unity
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