{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,2]],"date-time":"2026-02-02T11:39:27Z","timestamp":1770032367357,"version":"3.49.0"},"reference-count":67,"publisher":"SAGE Publications","issue":"1","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["IFS"],"published-print":{"date-parts":[[2021,8,11]]},"abstract":"<jats:p>Pawlak\u2019s rough set theory based on single granulation has been extended to multi-granulation rough set structure in recent years. Multi-granulation rough set theory has become a flouring research direction in rough set theory. In this paper, we propose the notion of (\u03b1, \u03b2)-multi-granulation bipolar fuzzified rough set ((\u03b1, \u03b2)-MGBFRSs). For this purpose, a collection of bipolar fuzzy tolerance relations has been used. In the framework of multi-granulation, we proposed two types of (\u03b1, \u03b2)-multi-granulation bipolar fuzzified rough sets model. One is called the optimistic (\u03b1, \u03b2)-multi-granulation bipolar fuzzified rough sets ((\u03b1, \u03b2)\u00a0o-MGBFRSs) and the other is called the pessimistic (\u03b1, \u03b2)-multi-granulation bipolar fuzzified rough sets ((\u03b1, \u03b2)\u00a0p-MGBFRSs). Subsequently, a number of important structural properties and results of proposed models are investigated in detail. The relationships among the (\u03b1, \u03b2)-MGBFRSs, (\u03b1, \u03b2)\u00a0o-MGBFRSs and (\u03b1, \u03b2)\u00a0p-MGBFRSs are also established. In order to illustrate our proposed models, some examples are considered, which are helpful for applying this theory in practical issues. Moreover, several important measures associated with (\u03b1, \u03b2)-multi-granulation bipolar fuzzified rough set like the measure of accuracy, the measure of precision, and accuracy of approximation are presented. Finally, we construct a new approach to multi-criteria group decision-making method based on (\u03b1, \u03b2)-MGBFRSs, and the validity of this technique is illustrated by a practical application. Compared with the existing results, we also expound its advantages.<\/jats:p>","DOI":"10.3233\/jifs-210717","type":"journal-article","created":{"date-parts":[[2021,7,10]],"date-time":"2021-07-10T04:57:47Z","timestamp":1625893067000},"page":"2025-2060","source":"Crossref","is-referenced-by-count":2,"title":["(\u03b1, \u03b2)-Multi-granulation bipolar fuzzified rough sets and their applications to multi criteria group decision making"],"prefix":"10.1177","volume":"41","author":[{"given":"Rizwan","family":"Gul","sequence":"first","affiliation":[{"name":"Department of Mathematics, Quaid-i-Azam University, Islamabad, Pakistan"}]},{"given":"Muhammad","family":"Shabir","sequence":"additional","affiliation":[{"name":"Department of Mathematics, Quaid-i-Azam University, Islamabad, Pakistan"}]}],"member":"179","reference":[{"key":"10.3233\/JIFS-210717_ref1","doi-asserted-by":"crossref","first-page":"3329","DOI":"10.1016\/j.asoc.2011.01.003","article-title":"A note on soft sets, rough sets and 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