Vol. 72 No. 6 (2020)

Research articles

• Bounds for the right spectral radius of quaternionic matrices

  I. Ali

  723-735

  • pdf

• Optimal recovery of elements from Hilbert space and their scalar products by Fourier coefficients known with error

  M. S. Gunko, V. F. Babenko, N. V. Parfinovych

  736-750

  • pdf (Ukrainian)

• Unitary subgroups of commutative group algebras of characteristic two

  V. Laver, Z. Balogh

  751-757

  • pdf (Ukrainian)

• Bounded solutions of a system of linear inhomogeneous differential equations of the first order with rectangular matrices

  A. A. Boichuk, M. A. Elishevich

  758-775

  • pdf (Russian)

• On the theory of integral manifolds for some delayed partial differential equations with nondense domain

  C. Jendoubi

  776-789

  • pdf

• Positive solutions of a three-point boundary-value problem for $\mathcal {p}$-Laplacian dynamic equation on time scales

  A. Dogan

  790-805

  • pdf

• On $\sigma$-subnormal subgroups of finite 3'-groups

  S. F. Kamornikov, V. N. Tyutyanov

  806-811

  • pdf (Russian)

• Quaternionic fractional Fourier transform for Boehmians

  R. Roopkumar

  812-821

  • pdf

• Exponentially dichotomous difference equations with piecewise constant operator coefficients

  V. Yu. Slyusarchuk

  822-841

  • pdf (Ukrainian)

• On $\mathcal{p}(x)$-Kirchhoff-type equation involving $\mathcal{p}(x)$-biharmonic operator via genus theory

  S. Taarabti, Z. El Allali , K. Ben Haddouch

  842-851

  • pdf

• Mean-square approximation by an angle in $L_2$ and the values of quasiwidths for some classes of functions

  M. Sh. Shabozov, M. O. Akobirshoev

  852-864

  • pdf (Russian)