for example
{
d(x1)/dN=f1(x1,x2,..,xn)
d(x2)/dN=f2(x1,x2,...,xn)
d(x3)/dN=f3(x1,x2,...xn)
.....
d(xk)/dN=fk(x1,x2,...xn)
}
THe general problem, is, that right-hand sides of equations are usially have complex manner. It would be very hellpful to get information, that deals with that subject. Respect!
