Dear all,
Thank you very much for your quick responses.
For a polytope P with vertices V = {v1, v2, ..., vn}, the set
a) {y | <y,v> >= -1 for all vertices v of P}
is different from the set
b) {y | <y,v> <= 1 for all vertices v of P}.
I thought b) is the definition of a polar set. That's what I ...

