@property<EOL><INDENT>def Ainv(self):<DEDENT>
if getattr(self, '<STR_LIT>', None) is None:<EOL><INDENT>self._Ainv = self.Solver(self.A, <NUM_LIT>)<EOL>self._Ainv.run_pardiso(<NUM_LIT:12>)<EOL><DEDENT>return self._Ainv<EOL>
Returns a Solver instance