1. On the existence of permutations of infinite sets without fixed points in set theory without choice

   • E. Tachtsis

   OriginalPaper 18 August 2018 Pages: 281 - 300

2. On crossing families of complete geometric graphs

   • D. Lara
   • C. Rubio-Montiel

   OriginalPaper 22 October 2018 Pages: 301 - 311

3. Necessary and sufficient conditions for complete convergence of double weighted sums of pairwise independent identically distributed random elements in Banach spaces

   • L. V. Thanh
   • N. T. Thuy

   OriginalPaper 22 September 2018 Pages: 312 - 326

4. Settling some sum suppositions

   • C. Vignat
   • T. Wakhare

   OriginalPaper 22 October 2018 Pages: 327 - 348

5. On the existence of periodic solutions to constrained Lagrangian systems

   • O. Zubelevich

   OriginalPaper 05 January 2019 Pages: 349 - 363

6. Homogeneous continua that are not separated by arcs

   • J. van Mill
   • V. Valov

   OriginalPaper 22 October 2018 Pages: 364 - 370

7. Inverse images of open sets under gradient mapping

   • A. Skálová

   OriginalPaper 22 October 2018 Pages: 371 - 386

8. Characterizations of biselective operations

   • J. Devillet
   • G. Kiss

   OriginalPaper 06 December 2018 Pages: 387 - 407

9. Weighted mixed-norm inequality on Doob’s maximal operator and John–Nirenberg inequalities in Banach function spaces

   • W. Chen
   • K.-P. Ho
   • D. Zhou

   OriginalPaper 06 December 2018 Pages: 408 - 433

10. Commutativity in the lattice of topologizing filters of a ring – localization and congruences

    • N. Arega
    • J. van den Berg

    OriginalPaper 26 February 2019 Pages: 434 - 458

11. On some properties of the space of upper semicontinuous functions

    • A. V. Osipov
    • E. G. Pytkeev

    OriginalPaper 02 January 2019 Pages: 459 - 464

12. On two sided α-n-derivation in 3-prime near-rings

    • L. Oukhtite
    • A. Raji

    OriginalPaper 06 December 2018 Pages: 465 - 477

13. Heron triangles with figurate number sides

    • J. Peng
    • Y. Zhang

    OriginalPaper 02 January 2019 Pages: 478 - 488

14. Homotopy investigation of classifying spaces of cobordisms of singular maps

    • A. Szűcs
    • T. Terpai

    OriginalPaper 28 February 2019 Pages: 489 - 502

15. On weakly semiconformally symmetric manifolds

    • U. C. De
    • Y. J. Suh

    OriginalPaper 22 October 2018 Pages: 503 - 521

16. A generalization of a theorem of Nagell

    • Y. L. Feng
    • S. F. Hong
    • Q. Y. Yin

    OriginalPaper 03 January 2019 Pages: 522 - 536

17. Recurrence relation and multi-indexed polynomials of the second kind

    • Á. P. Horváth

    OriginalPaper 26 February 2019 Pages: 537 - 550