> <\body> First order jet spaces, namely [x]/(x)>, are implemented in the class |mmx::tangent> defined in |numerix/tangent.hpp>. They are compatible with all the floating types. <\cpp-fragment> #include\numerix/tangent.hpp\ using namespace mmx; void main () { \ \ tangent\double\ a (2.0, 3.0); \ \ mmout \\ "a= " \\ base (a)\ \ \ \ \ \ \ \ \ \\ " + " \\ slope (a) \\ " * x + O(x^2)\\n"; } . If you don't have this file, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.> <\initial> <\collection>