What is the correct way to program in GAMS the following Subtours elimination equation for VRP approach MTZ?

- u(i) - u(j) + n*x(i,j) <= n - dj
- di<=u(i)<=n[/b][/i][/i]

Fuente : Toth, P. and Vigo, D,Vehicle Routing: Problems,Methods and applications, second edition, 2014.

ecuacion.pdf (183 KB)

Thanks.