| Article ID: | iaor19921539 |
| Country: | India |
| Volume: | 7 |
| Issue: | 2 |
| Start Page Number: | 85 |
| End Page Number: | 89 |
| Publication Date: | Aug 1991 |
| Journal: | International Journal of Management and Systems |
| Authors: | Lal S.N., Kumar Ajay |
Using some properties of semi-differentiable functions, the authors give a sufficient optimality condition and establish various duality theorems under weaker invexity assumptions.