On a problem of V. Pták
Ivan Korec (1978)
Časopis pro pěstování matematiky
Similarity:
Ivan Korec (1978)
Časopis pro pěstování matematiky
Similarity:
Zhongxue, Lü, Hongzheng, Xie (2007)
Journal of Inequalities and Applications [electronic only]
Similarity:
Ladislav Mišík, János T. Tóth (2003)
Journal de théorie des nombres de Bordeaux
Similarity:
In the paper sufficient conditions for the -density of a set of positive integers in terms of logarithmic densities are given. They differ substantially from those derived previously in terms of asymptotic densities.
František Púchovský (1976)
Mathematica Slovaca
Similarity:
Kwangseok Choe, Namkwon Kim (2008)
Annales de l'I.H.P. Analyse non linéaire
Similarity:
Alexey Filinovskiy (2011)
Mathematica Bohemica
Similarity:
We investigate the spectral properties of the differential operator , with the Dirichlet boundary condition in unbounded domains whose boundaries satisfy some geometrical condition. Considering this operator as a self-adjoint operator in the space with the norm , we study the structure of the spectrum with respect to the parameter . Further we give an estimate of the rate of condensation of discrete spectra when it changes to continuous.