Solve UX=B where U is an upper (or unit-upper) triangular matrix. U must be square. B must have the same number of rows

[omidrostaei]

Solve UX=B where U is an upper (or unit-upper) triangular matrix. U must be square. B must have the same number of rows as U.
Solve LX=B where L is a lower (or unit-lower) triangular matrix. L must be square. B must have the same number of rows as L.

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