> CheminOptique.mod:26: integrand following max{...} has invalid type
> Context: ...; var lambdaM = max { i in I , j in I } lambdaIJ [ i , j
> ] ;
> Model processing error
>
> I wanted to have the maximun of lamdba[i,j]
You want too much :) All constraints must be linear. You can try
reformulating your instance as follows:
var lambdaM;
s.t. foo{i in I, j in J}: lambdaM >= lambdaIJ[i,j];
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