ex expand(unsigned options=0) const;
ex coeff(const ex & s, int n=1) const;
ex eval(int level=0) const;
- ex subs(const lst & ls, const lst & lr) const;
exvector get_free_indices(void) const;
ex thisexprseq(const exvector & v) const;
ex thisexprseq(exvector * vp) const;