Hi;

suppose

I have a mixed integer problem maximizing Z

sets

y years /1, 2, 3…, n/

m months /1, 2, 3,…, 12/

w weeks /1, 2, 3,…, 7/

i facilities /F1, F2, F3, …,Fm/

parameters

C(i) capacity

Tlife(i) expected life time

Tini(i) age

positive variables

pA(y,m,b) production amount for A

pB(y,m,b) production amount for B

binary variables

x(i,y) investment decision for an old facility

I want to write a constraint for specific values of y such as “For y greater or equat to (Tlife(i) - Tini(i) + 1)” pA(y,m,b) + pB(y,m,b) =l= sum(i, C(i)*x(i,y)). How can I write such a constraint. Please help me!

I tried

Const(y,m,b)$(y.val ge Tlife(i) - Tini(i) +1)… pA(y,m,b) + pB(y,m,b) =l= sum(i, C(i)*x(i,y));

I know this expression is not true. But I don’t know how to write it. Please help me in writing such a constraint.

## Thanks to everybody.

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