def __add__(self, other): return MatrixBase.__add__(self, _force_mutable(other))
def __add__(self, other): return MatrixBase.__add__(self, _force_mutable(other))
def __add__(self, other): return MatrixBase.__add__(self, _force_mutable(other))
def __add__(self, other): return MatrixBase.__add__(self, _force_mutable(other))