Results 71 to 80 of about 261,453 (169)

Approximation of a singular boundary value problem for a linear differential equation

open access: yesҚарағанды университетінің хабаршысы. Математика сериясы
This paper addresses the approximation of a bounded (on the entire real axis) solution of a linear ordinary differential equation, where the matrix approaches zero as t →∓∞ and the right-hand side is bounded with a weight. We construct regular two-point
R. Uteshova, Y. Kokotova
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On the Equivalence of Elementary Surfaces with Respect to the Motion Group of Pseudo-Euclidean Space

open access: yesҚарағанды университетінің хабаршысы. Математика сериясы
This paper investigates the conditions for the equivalence of regular surfaces with respect to the action of a certain subgroup of linear transformations.
R.A. Gafforov, S. Kerbal, S.S. Juraboyev
doaj   +1 more source

Fundamental theorems of summability theory for double sequences via stretching by blocks

open access: yesJournal of Inequalities and Applications
This paper extends fundamental theorems of summability theory to double sequences using stretching by blocks technique. We prove Steinhaus- and Buck-type theorems for double sequences, characterizing sequences that resist summability by RH-regular ...
Sami M. Hamid, Richard F. Patterson
doaj   +1 more source

Higher-order linear matrix descriptor differential equations of Apostol-Kolodner type

open access: yesElectronic Journal of Differential Equations, 2009
In this article, we study a class of linear rectangular matrix descriptor differential equations of higher-order whose coefficients are square constant matrices.
doaj  

Friedrichs extension of singular symmetric differential operators

open access: yesElectronic Journal of Differential Equations, 2023
Qinglan Bao, Guangsheng Wei, Anton Zettl
doaj  

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