| Article ID: | iaor201526154 |
| Volume: | 69 |
| Issue: | 2 |
| Start Page Number: | 337 |
| End Page Number: | 341 |
| Publication Date: | Jun 2015 |
| Journal: | Numerical Algorithms |
| Authors: | Dai Zhifeng, Wen Fenghua |
| Keywords: | gradient methods |
In this note, we show that there are some improvements in the proof of Theorem 2 and Theorem 4 in Andrei (2008). Moreover, the assumption 0 <