ex subs(const exmap & m, unsigned options = 0) const;
ex conjugate() const;
bool is_polynomial(const ex & var) const;
+
+ void archive(archive_node& n) const;
+ void read_archive(const archive_node& n, lst& syms);
protected:
bool is_equal_same_type(const basic & other) const;
unsigned return_type() const;