`ptozp'
-------

ptozp(POLY)
     :: Converts a polynomial POLY with rational coefficients into an
     integral polynomial such that GCD of all its coefficients is 1.

RETURN
     polynomial

POLY
     polynomial

   * Converts the given polynomial by multiplying some rational number
     into an integral polynomial such that GCD of all its coefficients
     is 1.

   * In general, operations on polynomials can be performed faster for
     integer coefficients than for rational number coefficients.
     Therefore, this function is conveniently used to improve
     efficiency.

   * Function `red' does not convert rational coefficients of the
     numerator.  You cannot obtain an integral polynomial by direct use
     of the function `nm()'.  The function `nm()' returns the numerator
     of its argument, and a polynomial with rational coefficients is
     the numerator of itself and will be returned as it is.

     [0] ptozp(2*x+5/3);
     6*x+5
     [1] nm(2*x+5/3);
     2*x+5/3

References
     *Note `nm dn': nm dn.

