| Article ID: | iaor19981007 |
| Country: | United Kingdom |
| Volume: | 34 |
| Issue: | 2 |
| Start Page Number: | 559 |
| End Page Number: | 563 |
| Publication Date: | Jun 1997 |
| Journal: | Journal of Applied Probability |
| Authors: | Wang Yong-Jin |
| Keywords: | branching process |
Gorostiza and Wakolbinger, and Dawson and Perkins established the same persistence criterion for a class of critical branching particle systems and for a class of superprocesses respectively. In this note we take another approach to the criterion and present a simpler proof of it.