Subdiagonal

adj, noun

adj, noun ·Rare ·Advanced level

Definitions

Noun
  1. 1
    The diagonal of a matrix that lies directly below and to the left of the main diagonal.
Adjective
  1. 1
    Said of an entry of a square matrix: that it lies anywhere in the lower triangular area below the main diagonal of the matrix. not-comparable

    "(3) From R, we obtain the set of points #92;mathbb#123;R#125;#92;tbinom#123;n#125;#123;2#125; whose coordinates are the subdiagonal entries of the corresponding matrices:"

Example

More examples

"(3) From R, we obtain the set of points #92;mathbb#123;R#125;#92;tbinom#123;n#125;#123;2#125; whose coordinates are the subdiagonal entries of the corresponding matrices:"

Etymology

From sub- + diagonal.

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.