| Article ID: | iaor20084735 |
| Country: | Netherlands |
| Volume: | 176 |
| Issue: | 1 |
| Start Page Number: | 641 |
| End Page Number: | 642 |
| Publication Date: | Jan 2007 |
| Journal: | European Journal of Operational Research |
| Authors: | Frenk J.B.G. |
In this technical note, we give a short proof based on some standard results in convex analysis of some important characterization results listed in Theorems 3 and 4 of Benson. Actually our result is slightly more general since we do not specify the nonempty convex set