tridiagonal

English

Etymology

From tri- +‎ diagonal.

Adjective

English Wikipedia has an article on:

tridiagonal matrix

Wikipedia

tridiagonal (not comparable)

1. (linear algebra, of a matrix) Having nonzero elements only in the main diagonal and the diagonals directly above and below it.
   • 2019 June 24, Juan Triana, “Negafibonacci Numbers via Matrices”, in Bulletin of TICMI‎, volume 23, number 1, →ISSN, archived from the original on 13 July 2019, Negafibonacci numbers as tridiagonal matrix determinants, page 3:

     The following proposition shows a connection between negafibonacci numbers and the determinants of a family of tridiagonal matrices.

Derived terms

• tridiagonality