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![arXiv:2009.10016v1 [math.AP] 21 Sep 2020E-mail address: mohamed.berbiche@univ-biskra.dz, berbichemed@yahoo.fr . E-mail address: mokhtar.kirane@univ-lr.fr, 1 every nontrivial solution](https://static.cupdf.com/doc/110x72/6083fa405642c0022a6c5ad9/arxiv200910016v1-mathap-21-sep-2020-e-mail-address-univ-biskradz-berbichemedyahoofr.jpg)
