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Spectral symmetry of solutions of boundary value problems in Banach algebras
. For Banach algebras A and solutions u : [0 , 1] → A of u ′′ ( t ) + f ( u ( t )) + λu ′ ( t ) 2 = 0 , u (0) = 0 , u (1) = 0 , we prove symmetry of the spectrum σ ( u ( t )) , that is, σ ( u ( t )) = σ ( u (1 − t )) for all t ∈ [0 , 1] , whenever σ ( u ([0 , 1])) lies in a cone of the complex plane.
期刊介绍:
Annales Polonici Mathematici is a continuation of Annales de la Société Polonaise de Mathématique (vols. I–XXV) founded in 1921 by Stanisław Zaremba.
The journal publishes papers in Mathematical Analysis and Geometry. Each volume appears in three issues.