Question: 8 Tridiagonal matrices have zero entries except on the main diagonal and the two adja- cent diagonals. Factor these into A = LU. Symmetry further

8 Tridiagonal matrices have zero entries except on the main diagonal and the two adja- cent diagonals. Factor these into A = LU. Symmetry further produces A = LDLT: 1 0 a a O A = 1 2 1 and A = a atb b 2 b b+ c

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