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triangular matrix

American  

noun

Mathematics.

  1. a square matrix in which either all the entries above the principal diagonal, or all the entries below the principal diagonal, are zero.

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Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.