Шаблон:TridiagMatrix
[math]\displaystyle{ \begin{pmatrix} \alpha_1 & \beta_1 \\ \beta_1 & \alpha_2 & \beta_2 \\ & \beta_2 & \ddots & \ddots \\ & & \ddots & \ddots & \beta_{n-1} \\ & & & \beta_{n-1} & \alpha_n \end{pmatrix} }[/math]
[math]\displaystyle{ \begin{pmatrix} \alpha_1 & \beta_1 \\ \beta_1 & \alpha_2 & \beta_2 \\ & \beta_2 & \ddots & \ddots \\ & & \ddots & \ddots & \beta_{n-1} \\ & & & \beta_{n-1} & \alpha_n \end{pmatrix} }[/math]