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  1. The aim of this paper is to establish some results about the existence of multiple solutions for the following singular semipositone boundary value problem of fourth-order differential systems with parameters:

    Authors: Longfei Lin, Yansheng Liu and Daliang Zhao

    Citation: Boundary Value Problems 2021 2021:79

    Content type: Research

    Published on:

  2. In this work, we investigate the existence, uniqueness, and stability of fractional differential equation with multi-point integral boundary conditions involving the Caputo fractional derivative. By utilizing ...

    Authors: Mehboob Alam, Akbar Zada, Ioan-Lucian Popa, Alireza Kheiryan, Shahram Rezapour and Mohammed K. A. Kaabar

    Citation: Boundary Value Problems 2021 2021:73

    Content type: Research

    Published on:

  3. In this paper, we study the effect of Hardy potential on the existence or nonexistence of solutions to the following fractional problem involving a singular nonlinearity:

    http://static-content.springer.com/image/art%3A10.1186%2Fs13661-021-01545-2/13661_2021_1545_Article_Equa.gif ...

    Authors: Masoud Bayrami-Aminlouee, Mahmoud Hesaaraki, Mohamed Karim Hamdani and Nguyen Thanh Chung

    Citation: Boundary Value Problems 2021 2021:68

    Content type: Research

    Published on:

  4. In this manuscript, we examine both the existence and the stability of solutions to the implicit boundary value problem of Caputo fractional differential equations of variable order. We construct an example to...

    Authors: Amar Benkerrouche, Mohammed Said Souid, Kanokwan Sitthithakerngkiet and Ali Hakem

    Citation: Boundary Value Problems 2021 2021:64

    Content type: Research

    Published on:

  5. The topological sensitivity method is an optimization technique used in different inverse problem solutions. In this work, we adapt this method to the identification of plasma domain in a Tokamak. An asymptoti...

    Authors: Mohamed Abdelwahed, Nejmeddine Chorfi, Maatoug Hassine and Imen Kallel

    Citation: Boundary Value Problems 2021 2021:50

    Content type: Research

    Published on:

  6. In this paper, using variational method, we study the existence of an infinite number of solutions (some are positive, some are negative, and others are sign-changing) for a non-homogeneous elliptic Kirchhoff ...

    Authors: Baoqiang Yan, Donal O’Regan and Ravi P. Agarwal

    Citation: Boundary Value Problems 2021 2021:44

    Content type: Research

    Published on:

  7. In this paper, we introduce a new class of hemivariational inequalities, called dynamic boundary hemivariational inequalities, reflecting the fact that the governing operator is also active on the boundary. In...

    Authors: Khadija Aayadi, Khalid Akhlil, Sultana Ben Aadi and Mourad El Ouali

    Citation: Boundary Value Problems 2021 2021:43

    Content type: Research

    Published on:

  8. In this work, we create new oscillation conditions for solutions of second-order differential equations with continuous delay. The new criteria were created based on Riccati transformation technique and compar...

    Authors: Osama Moaaz, Choonkil Park, Elmetwally M. Elabbasy and Waed Muhsin

    Citation: Boundary Value Problems 2021 2021:35

    Content type: Research

    Published on:

  9. In the paper, we study a boundary value problem for a class of ψ-Hilfer fractional-order Langevin equations with multi-point integral boundary conditions. Existence and uniqueness results are established by using...

    Authors: Cholticha Nuchpong, Sotiris K. Ntouyas, Devaraj Vivek and Jessada Tariboon

    Citation: Boundary Value Problems 2021 2021:34

    Content type: Research

    Published on:

  10. The aim of this paper is to investigate the optimal harvesting strategies of a stochastic competitive Lotka–Volterra model with S-type distributed time delays and Lévy jumps by using ergodic method. Firstly, t...

    Authors: Hong Qiu, Wenmin Deng and Mingqi Xiang

    Citation: Boundary Value Problems 2021 2021:31

    Content type: Research

    Published on:

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