Abstract
In this paper, we study the existence and multiplicity of solutions to the fourth-order boundary value problem u ( 4 ) ( t ) + β u ″ ( t ) − α u ( t ) = f ( t , u ( t ) ) for all t ∈ [ 0 , 1 ] subject to Dirichlet boundary value condition, where f ∈ C 1 ( [ 0 , 1 ] × R 1 , R 1 ) , α , β ∈ R 1 . By using the critical point theory and the infinite dimensional Morse theory, we establish some conditions on f which are able to guarantee that this boundary value problem has at least one nontrivial, two nontrivial, m distinct pairs of solutions, and infinitely many solutions, respectively. Our results improve some recent works.
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