int ldegree(const ex & s) const;
ex coeff(const ex & s, int n=1) const;
ex eval(int level=0) const;
+ ex evalm(void) const;
ex series(const relational & r, int order, unsigned options = 0) const;
ex normal(lst &sym_lst, lst &repl_lst, int level=0) const;
numeric integer_content(void) const;