Multiple Solutions for Doubly Resonant Elliptic Problems Using Critical Groups
- 
							
								
							
								Ravi P. Agarwal
							
							
															
									
									
									agarwal@fit.edu
									
								
													
							
						 - 
							
								
							
								Michael E. Filippakis
							
							
															
									
									
									mfilip@math.ntua.gr
									
								
													
							
						 - 
							
								
							
								Donal O‘Regan
							
							
															
									
									
									donal.oregan@nuigalway.ie
									
								
													
							
						 - 
							
								
							
								Nikolaos S. Papageorgiou
							
							
															
									
									
									npapg@math.ntua.gr
									
								
													
							
						 
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Abstract
We consider a semilinear elliptic equation, with a right hand side nonlinearity which may grow linearly. Throughout we assume a double resonance at infinity in the spectral interval [λ1, λ2]. In this paper, we can also have resonance at zero or even double resonance in the order interval [λm, λm+1], m ≥ 2. Using Morse theory and in particular critical groups, we prove two multiplicity theorems.
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