Question: how can find maximum value

I need help me, i need find maximum value,this form is false LL := proc (x, y) option inline; abs(wr(x, y)-w3(x, y)) end proc; CodeTools:-Usage(evalhf(maximize(LL(DD*i, DD*j), i = 0 .. N, j = 0 .. N))); Error, (in CodeTools:-Usage) cannot handle unevaluated name `i` in evalhf
Please Wait...