def _represent_coupled_base(self, **options):
        evect = self.uncoupled_class()
        if not self.j.is_number:
            raise ValueError(
                'State must not have symbolic j value to represent')
        if not self.hilbert_space.dimension.is_number:
            raise ValueError(
                'State must not have symbolic j values to represent')
        result = zeros(self.hilbert_space.dimension, 1)
        if self.j == int(self.j):
            start = self.j**2
        else:
            start = (1 - 2*self.j)*(1 + 2*self.j)/4
        result[start:start + 2*self.j + 1, 0] = evect(
            self.j, self.m)._represent_base(**options)
        return result
dataset/ETHPy150Open sympy/sympy/sympy/physics/quantum/spin.py/CoupledSpinState._represent_coupled_base/swapped operands of `-`