int ldegree(const symbol & s) const;
ex coeff(const symbol & s, int n=1) const;
ex eval(int level=0) const;
+ ex evalf(int level=0) const;
ex series(const symbol & s, const ex & point, int order) const;
ex normal(lst &sym_lst, lst &repl_lst, int level=0) const;
numeric integer_content(void) const;