1. Around averaged mappings

   • Jarosław Górnicki
   • Ravindra K. Bisht

   OriginalPaper Open access 02 August 2021 Article: 48

2. Existence of solutions of polynomial-like iterative equation with discontinuous known functions

   • Zhiheng Yu
   • Jinghua Liu

   OriginalPaper 28 July 2021 Article: 47

   

3. On the number of positive solutions for a four-point boundary value problem with generalized Laplacian

   • Tingzhi Cheng
   • Xianghui Xu

   OriginalPaper 28 July 2021 Article: 46

4. New examples of subsets of c with the FPP and stability of the FPP in hyperconvex spaces

   • Rafael Espínola-García
   • María Japón
   • Daniel Souza

   OriginalPaper Open access 22 July 2021 Article: 45

5. Multi-step inertial Krasnosel’skiǐ–Mann iteration with new inertial parameters arrays

   • Qiao-Li Dong
   • Xiao-Huan Li
   • Themistocles M. Rassias

   OriginalPaper 20 July 2021 Article: 44

   

6. Normalized ground states for semilinear elliptic systems with critical and subcritical nonlinearities

   • Houwang Li
   • Wenming Zou

   OriginalPaper 18 July 2021 Article: 43

7. Common fixed points for commuting multivalued non-convex mappings in metric trees

   • M. Gabeleh
   • J. Markin

   OriginalPaper 17 July 2021 Article: 42

8. Stability analysis of set-valued inverse variational inequalities in reflexive Banach spaces

   • Xue-ping Luo

   OriginalPaper 15 July 2021 Article: 41

9. Measures of noncompactness in modular spaces and fixed point theorems for multivalued nonexpansive mappings

   • T. Domínguez Benavides
   • P. Lorenzo Ramírez

   OriginalPaper Open access 13 July 2021 Article: 40

10. Homoclinic solutions for a class of relativistic Liénard equations

    • Shiping Lu
    • Shile Zhou
    • Xingchen Yu

    OriginalPaper 12 July 2021 Article: 39

11. Some remarks on fixed sets for perturbed multivalued mappings

    • M. Y. Abdallah
    • A. Al-Izeri
    • K. Latrach

    OriginalPaper 29 June 2021 Article: 38

12. On the Meir–Keeler theorem in quasi-metric spaces

    • Mecheraoui Rachid
    • Zoran D. Mitrović
    • Zohreh Bagheri

    OriginalPaper 12 June 2021 Article: 37

13. Implicit subdifferential inclusions with nonconvex-valued perturbations

    • Sergey A. Timoshin
    • Alexander A. Tolstonogov

    OriginalPaper 11 June 2021 Article: 36

14. Fixed point results for decreasing convex orbital operators in Hilbert spaces

    • Adrian Petruşel
    • Gabriela Petruşel

    OriginalPaper 11 June 2021 Article: 35

15. Ground state and nodal solutions for critical Schrödinger–Kirchhoff-type Laplacian problems

    • Huabo Zhang

    OriginalPaper 20 May 2021 Article: 34

16. Ulam stability of functional equations in 2-Banach spaces via the fixed point method

    • Krzysztof Ciepliński

    OriginalPaper Open access 10 May 2021 Article: 33