An Algorithm for Solving a Special Class of Tridiagonal Systems of Linear Equations An algorithm is presented for solving a system of linear equation Bu=k where B is tridiagonal and of a special form. It is shown that this algorithm is almost twice as fast as the Gaussian elimination method usually suggested for solving such systems. In addition, explicit formulas for the inverse and determinant of the matrix B are given. CACM April, 1969 Rose, D. J. tridiagonal, Gaussian elimination, central difference 5.14 5.17 CA690407 JB February 17, 1978 4:18 PM 1910 5 1910 1910 5 1910 1910 5 1910