Question: Prove that the matrix A = 1 2 1 0 1 1 is nonsingular and that it does not possess a (naive) LU factorization

Prove that the matrix A = 1 2 1 0 1 1 is
Prove that the matrix A = 1 2 1 0 1 1 is nonsingular and that it does not possess a (naive) LU factorization

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