[Help-glpk] Questions to MathProg

[Gottfried Lindner]

Hello,

I have two questions to MathProg.

1) I have a set I, which is an interval. Instead of writing
        set I := 1 2 3 4 5;
I thought, I can write
        set I := 1 .. 5;
but this is not correct. What's wrong?

2) I have a restriction of the form
s.t. Rb{v1 in V,v2 in V: v1<v2}: ...
This works, if V contains numbers. If V contains symbols, v1<v2 is not
allowed.
Is there a function to convert symbols to their position in the set or
something like that?

Thank's
Gottfried