(Formerly: Hacettepe Bulletin of Natural Sciences and Engineering - Series B) Hacettepe Journal of Mathematics and Statistics is an international peer-reviewed open-access journal ( with no article processing/publishing charge ) devoted to the publication of original research papers and occasional surveys of a suitably high standard, written in English, on all aspects of Mathematics and Statistics. Papers on the interface between Mathematics and Statistics are particularly welcome, including applications to Physics, Actuarial Sciences, Finance, and Economics. Journal Impact Factor Trend 2021 is 0.867. Issue 52(4) of HJMS has been published!