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subdiagonal

From Wiktionary, the free dictionary

English

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Etymology

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From sub- +‎ diagonal.

Adjective

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subdiagonal (not comparable)

  1. (mathematics) Said of an entry of a square matrix: that it lies anywhere in the lower triangular area below the main diagonal of the matrix.
    • 2010, Martin Aigner with Günter M. Ziegler, chapter 16, in Proofs from THE BOOK, 4th edition, Delhi, India: Springer (India), published 2013, page 97:
      (3) From R, we obtain the set of points whose coordinates are the subdiagonal entries of the corresponding matrices:
      .

Noun

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subdiagonal (plural subdiagonals)

  1. (mathematics) The diagonal of a matrix that lies directly below and to the left of the main diagonal.