
BAREKENG : Journal of Mathematics and Its Applications, Volume 19 Issue 4 (December 2025) has been available online since September 2025. All officially published articles are written in English. This volume is published four times a year in March, June, September, and December. All articles in this issue (60 research articles) include 273 authors from Indonesia, USA, Malaysia, Oman, Philipina, Nigeria, India, Iraq, Albania, Saudi Arabia, and Thailand.