public:
unsigned precedence() const {return 50;}
bool info(unsigned inf) const;
+ bool is_polynomial(const ex & var) const;
int degree(const ex & s) const;
int ldegree(const ex & s) const;
ex coeff(const ex & s, int n = 1) const;
ex smod(const numeric &xi) const;
numeric max_coefficient() const;
exvector get_free_indices() const;
+ ex conjugate() const;
protected:
ex derivative(const symbol & s) const;
ex eval_ncmul(const exvector & v) const;