code: def remove(self, other):
          
          if other is FullSpace:
              return TrivialSpace
          if other is TrivialSpace:
              return self
          if isinstance(other, ProductSpace):
              oops = set(other.operands)
          else:
              oops = {other}
          return ProductSpace.create(
                  *sorted(set(self.operands).difference(oops)))
docs: Remove a particular factor from a tensor product space.