function [ res ] = F(t,x,u,ux,uxx)
% 
% Checked (WWX): 2005-11-19
% 
% Written by:
% -- 
% John L. Weatherwax                2005-06-15
% 
% email: wax@alum.mit.edu
% 
% Please send comments and especially bug reports to the
% above email address.
% 
%-----
  
res = [ u(2)*u(2)*uxx(1) - u(1)*u(2) - u(1)^2 + 10     + 2*u(2)*ux(2)*ux(1);
	u(1)*u(1)*uxx(2) + u(1)*u(2) - u(2)^2 + uxx(1) + 2*u(1)*ux(1)*ux(2); ];