https://root.cern.ch/root/html604/TMatrixT_double_.html#TMatrixT_double_:Mult

says

General matrix multiplication. Create a matrix C such that C = A * B.

What is this mysterious matrix C? In other words how can I get a result of matrix multiplication?

TMatrixD C;

C.Mult(A*B); ?

Why isn’t there a * operator defined for TMatrix (TMatrixD C = A*B)?