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principal diagonal
prin·ci·pal di·ag·o·nal (plural prin·ci·pal di·ag·o·nals)


noun 
Definition:
 
line across matrix: in a square matrix, the diagonal line that extends from the upper left corner to the lower right corner
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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