Tridiagonal matrix

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What Wikipedia says

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). For example, the following matrix is tridiagonal:

Excerpt from the Wikipedia article “Tridiagonal matrix”, under the CC BY-SA 4.0 license. Read the article on Wikipedia