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Publicado en línea: 30 dic 2015
Páginas: 105 - 119
Recibido: 04 abr 2015
DOI: https://doi.org/10.1515/aupcsm-2015-0008
© by Abhijit Banerjee
This work is licensed under the Creative Commons Attribution-ShareAlike 4.0 International License.
In the paper based on the question of Zhang and Lü [15], we present one theorem which will improve and extend results of Banerjee-Majumder [2] and a recent result of Li-Huang [9].