Complete biorthogonal systems of Bessel functions
Journal Title: Математичні Студії - Year 2017, Vol 48, Issue 2
Abstract
Let ν≥−1/2 and (ρk)k∈N be a sequence of nonzero complex numbers such that ρ2k≠ρ2m for k≠m. We prove that if the system {xρk−−−√Jν(xρk):k∈N} of Bessel functions of the first kind of index ν≥−1/2 is exact (i.e. complete and minimal) in the space L2(0;1), then its biorthogonal system is also exact in L2(0;1).
Authors and Affiliations
Bohdan Vynnyts’kyi, Ruslan Khats'
On bonding of some bitopological notions
In this paper, we study two strong forms of separations axioms on bitopological spaces and we observe that the results on such axioms are odd compared to prevailing results of bitopological spaces or topological spaces,...
On mathematical realism and applicability of hyperreals
We argue that Robinson’s hyperreals have just as much claim to applicability as the garden variety reals. In a recent text, Easwaran and Towsner (ET) analyze the applicability of mathematical techniques in the sciences,...
Analytic functions in the unit ball of bounded L-index: asymptotic and local properties
We have generalized some criteria of boundedness of L-index in joint variables for analytic functions in the unit ball, where L:Bn→Rn+ is a continuous vector-function, Bn is the unit ball in Cn. One of propositions gives...
Composition of entire functions and bounded L-index in direction
In the present paper we give an answer to the following question: Let f:C→C be an entire function of bounded l-index, Φ:Cn→C be an entire function, n≥2, l:C→R+ be a continuous function. What are a positive continuous fun...
Existence of solitary traveling waves in Fermi-Pasta-Ulam system on 2D–lattice
The article deals with the Fermi–Pasta–Ulam system that describes an infinite system of particles on 2D–lattice. The main result concerns the existence of solitary traveling wave solutions. By means of critical point the...