Solves the Sylvester's equation 

for real quasi-triangular or complex triangular matrices A and B. The solution (X) overwrites the C matrix. The AOp and BOp parameters indicate the TMtxOperation performed on A and B respectively. The TSign of the Sylvester equation is determined with the ASign parameter (siPlus for +, siMinus for -). The result of a Sylvester function is a scale factor a. The A and B matrices Quadratic property must be true, otherwise an exception is raised.

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