Shahid Beheshti University Categories and General Algebraic Structures with Applications 2345-5853 22 1 2025 01 01 Clustering in Celebrating Professor Themba A. Dube (A TAD Celebration II) 5 42 105284 10.48308/cgasa.2025.105284 EN Inderasan Naidoo Department of Mathematical Sciences, University of South Africa, P.O.Box 392, Tshwane, UNISA 0003, South Africa. National Institute for Theoretical and Computational Sciences (NITheCS), Johannesburg, South Africa. Journal Article 2025 01 18 This paper is the second in the series celebrating the mathematical works of Professor Themba Dube. In this sequel, we give prominence to Dube's pivotal contributions on pointfree convergence at the unstructured frame level, in the category of locales, and on his noteworthy conceptions on extensions and frame quotients. We distill and draw attention to particular studies of Dube on filters and his novel characterizations of certain conservative pointfree properties by filter and ultrafilter convergence, notably normality, almost realcompactness, and pseudocompactness. We also feature Dube's joint work on convergence and clustering of filters in <strong>Loc</strong> and coconvergence and coclustering of ideals in the category <strong>Frm</strong>. https://cgasa.sbu.ac.ir/article_105284_67f6f7f7df6d3bd8289d5949cbdaacb4.pdf