The existence of multiple solutions for the Klein-Gordon equation with concave and convex nonlinearities coupled with Born-Infeld theory on R3
Keywords: غیرخطی های کنجکاوی و محدب; primary; 35J61; secondary; 35C06; 35J20; Klein-Gordon equation; Born-Infeld theory; Concave and convex nonlinearities; Ekeland's variational principle; Mountain Pass Theorem;