void normalize(MathData const &, NormalStream &);
void maple(MathData const &, MapleStream &);
void maxima(MathData const &, MaximaStream &);
void normalize(MathData const &, NormalStream &);
void maple(MathData const &, MapleStream &);
void maxima(MathData const &, MaximaStream &);
bool extractNumber(MathData const & ar, int & i);
bool extractNumber(MathData const & ar, double & i);
bool extractNumber(MathData const & ar, int & i);
bool extractNumber(MathData const & ar, double & i);
MathData pipeThroughExtern(std::string const & language,
docstring const & extra, MathData const & ar);
MathData pipeThroughExtern(std::string const & language,
docstring const & extra, MathData const & ar);