Vol. 25 No. 2 (2019)

Articles

• Yuriy Makarovich Berezansky

  Editorial Board

  97-97

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• On eigenvalues of banded matrices

  O. Akhiiezer, O. Dunaievska

  98-103

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• On maximal multiplicity of eigenvalues of finite-dimensional spectral problem on a graph

  O. P. Boyko, O. M. Martynyuk, V. N. Pivovarchik

  104-117

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• Weak-coupling limit for ergodic environments

  Martin Friesen, Yu. G. Kondratiev

  118-133

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• The Welland inequality on hypergroups

  M. G. Hajibayov

  134-141

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• Abstract formulation of the Cole-Hopf transform

  Y. Iwata

  142-151

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• On isometries satisfying deformed commutation relations

  O. Ostrovska, R. Y. Yakymiv

  152-160

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• Köthe-Orlicz vector-valued weakly sequence spaces of difference operators

  Anu Choudhary, K. Raj

  161-176

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• Subscalarity of $k$-quasi-class $A$ operators

  M. H. M. Rashid

  177-188

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• Operators preserving orthogonality on Hilbert $\it{K}(H)$-modules

  R. G. Sanati, E. Ansari-piri, M. Kardel

  189-194

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