Tridiagonal matrix: Difference between revisions

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{{Short description|Matrix with nonzero elements on the main diagonal and the diagonals above and below it}}

In [[linear algebra]], a '''tridiagonal matrix''' is a [[band matrix]] that has nonzero elements only on the [[main diagonal]], the subdiagonal/lower diagonal (the first diagonal below this), and the supradiagonal/upper diagonal (the first diagonal above the main diagonal only).

For example, the following [[matrix (mathematics)|matrix]] is tridiagonal: