Question: If U 1 , U 2 are upper triangular and L 1 , L 2 are lower triangular, which of the following are triangular? U

If U1, U2 are upper triangular and L1, L2 are lower triangular, which of the following are triangular?

U1 + U2, U1U2, U12, U1 + L1, U1L1, L1 + L2

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