Methods Which Lead to a Heptadiagonal Form of the Matrix

3 Methods which Lead to a Heptadiagonal Form of the Matrix A. - Flack and Vanden Berghe100 have used the following method of discretization  

4 Numerov Discretization. - Flack and Vanden Berghe101 have used the well known Numerov method of discretization which leads to a tridiagonal (not necessarily symmetric) form for A and B. The method is of algebraic order 4, phase-lag order 4. The interval of periodicity is (0,6). 

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