Schwiebert, Ryan C. The radical-annihilator monoid of a ring. (English) Zbl 1386.16010 Commun. Algebra 45, No. 4, 1601-1617 (2017). MSC: 16N80 06F05 13E10 PDF BibTeX XML Cite \textit{R. C. Schwiebert}, Commun. Algebra 45, No. 4, 1601--1617 (2017; Zbl 1386.16010) Full Text: DOI arXiv OpenURL
Grabowski, Adam Topological interpretation of rough sets. (English) Zbl 1298.54006 Formaliz. Math. 22, No. 1, 89-97 (2014). MSC: 54A40 54H10 68T37 03B35 PDF BibTeX XML Cite \textit{A. Grabowski}, Formaliz. Math. 22, No. 1, 89--97 (2014; Zbl 1298.54006) Full Text: DOI OpenURL
Moslehian, M. S.; Tavallaii, N. A generalization of the Kuratowski closure-complement problem. (English) Zbl 0891.54005 J. Math., Punjab Univ. 28, 1-9 (1995). MSC: 54B99 PDF BibTeX XML Cite \textit{M. S. Moslehian} and \textit{N. Tavallaii}, J. Math., Punjab Univ. 28, 1--9 (1995; Zbl 0891.54005) OpenURL
Fife, James H. The Kuratowski closure-complement problem. (English) Zbl 0735.54001 Math. Mag. 64, No. 3, 180-182 (1991). MSC: 54A05 PDF BibTeX XML Cite \textit{J. H. Fife}, Math. Mag. 64, No. 3, 180--182 (1991; Zbl 0735.54001) Full Text: DOI OpenURL
Aull, Charles E. Classification of topological spaces. II. (English) Zbl 0758.54001 Bull. Pol. Acad. Sci., Math. 36, No. 11-12, 649-654 (1988). MSC: 54A05 54G05 54D30 PDF BibTeX XML Cite \textit{C. E. Aull}, Bull. Pol. Acad. Sci., Math. 36, No. 11--12, 649--654 (1988; Zbl 0758.54001) OpenURL