Upper and Lower Contra-$(\tau_1,\tau_2)$-continuity

Authors

  • Nongluk Viriyapong Mathematics and Applied Mathematics Research Unit, Department of Mathematics, Faculty of Science, Mahasarakham University, Maha Sarakham, 44150, Thailand
  • Areeyuth Sama-Ae Department of Mathematics and Computer Science, Faculty of Science and Technology, Prince of Songkla University, Pattani Campus, Pattani, 94000, Thailand
  • Chawalit Boonpok Mathematics and Applied Mathematics Research Unit, Department of Mathematics, Faculty of Science, Mahasarakham University, Maha Sarakham, 44150, Thailand

DOI:

https://doi.org/10.29020/nybg.ejpam.v18i2.6008

Keywords:

upper contra-$(\tau_1,\tau_2)$-continuous multifunction;, lower contra-$(\tau_1,\tau_2)$-continuous multifunction

Abstract

This paper presents new classes of multifunctions between bitopological spaces, namely upper contra-$(\tau_1,\tau_2)$-continuous multifunctions and lower contra-$(\tau_1,\tau_2)$-continuous multifunctions. Moreover, several characterizations and some properties concerning upper contra-$(\tau_1,\tau_2)$-continuous multifunctions and lower contra-$(\tau_1,\tau_2)$-continuous multifunctions are investigated. 

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Published

2025-05-01

Issue

Vol. 18 No. 2: (April 2025)

Section

Topology

License

Copyright (c) 2025 Nongluk Viriyapong, Areeyuth Sama-Ae, Chawalit Boonpok

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How to Cite

Upper and Lower Contra-$(\tau_1,\tau_2)$-continuity. (2025). European Journal of Pure and Applied Mathematics, 18(2), 6008. https://doi.org/10.29020/nybg.ejpam.v18i2.6008