void print(const print_context & c, unsigned level = 0) const;
unsigned precedence(void) const {return 30;}
bool info(unsigned inf) const;
+ int degree(const ex & s) const;
+ int ldegree(const ex & s) const;
+ ex coeff(const ex & s, int n = 1) const;
bool has(const ex &other) const;
ex eval(int level = 0) const;
ex evalf(int level = 0) const;