In this paper, we prove a new critical point theorem without the condition or the condition. Using this theorem, we prove the existence of infinitely many solutions of the following sublinear beam equation
Unlike the previous results on this equation, we do not impose any monotone conditions on the variable ξ in the nonlinearity b55c6cae3e52458" title="Click to view the MathML source">f(x,t,ξ).