L is lower triangular and S is symmetric. Assume they are invertible: L = a 0 0 b c 0 d
Chapter 4, Problem 4.4.25(choose chapter or problem)
L is lower triangular and S is symmetric. Assume they are invertible: L = a 0 0 b c 0 d e f S = a b d b c e d e f . (a) Which three cofactors of L are zero? Then L 1 is lower triangular. (b) Which three pairs of cofactors of S are equal? Then S 1 is symmetric.
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