Hi there, Some time ago, we have included different matrix structure types such as symmetric, positive definite and hermitian together with the generic matrices to solve AX=B problems in linalg.solve. Previously, there were two keywords in the signature namely "debug" and "sym_pos". These keywords, in my opinion, are obsolete and actually clutter the function signature because the dummy keyword "debug" has no functionality and "sym_pos" is covered by "assume_a" keyword as a special case. Hence I've proposed to deprecate these in https://github.com/scipy/scipy/pull/8715/files . Pauli also chimed in and mentioned that this might not be a good idea since this is a central function and the benefits might not be worth the effort and backwards compatibility problems. With Python2 dying, I think the backwards compatibility part won't be such important problem anymore and the benefit is that we don't need to have such strange signature. Thus, I'd like to ask around what others think about this since this indeed "needs-decision". ilhan