tridiagonal en · ADJ
Etymology
From tri- + diagonal.
Meanings
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(not-comparable, of a matrix) Having nonzero elements only in the main diagonal and the diagonals directly above and below it.
The following proposition shows a connection between negafibonacci numbers and the determinants of a family of tridiagonal matrices.
2019 June 24, Juan Triana, “Negafibonacci Numbers via Matrices”, in Bulletin of TICMI, volume 23, number 1, →ISSN, archived from the original on 13 Jul 2019, Negafibonacci numbers as tridiagonal matrix determinants, page 3: