ex series(const relational & r, int order, unsigned options = 0) const override;
ex thiscontainer(const exvector & v) const override;
ex thiscontainer(exvector && v) const override;
ex series(const relational & r, int order, unsigned options = 0) const override;
ex thiscontainer(const exvector & v) const override;
ex thiscontainer(exvector && v) const override;