| Article ID: | iaor20021389 |
| Country: | Netherlands |
| Volume: | 101 |
| Issue: | 1 |
| Start Page Number: | 351 |
| End Page Number: | 361 |
| Publication Date: | Jan 2001 |
| Journal: | Annals of Operations Research |
| Authors: | Zolezzi T. |
Estimates of the size of sets of approximate solutions are obtained for well-posed optimization problems in a Banach space, and extended to problems subject to perturbations of a general form. An estimate of the perturbations guaranteeing a prescribed level of suboptimality is presented.