참고문헌
- P. Howard and E. Tachtsis, On the minimal cover property in ZF, Topology Appl. 173 (2014), 94-106. https://doi.org/10.1016/j.topol.2014.05.021
- A. Mukharjee, On maximal, minimal open and closed sets, Commun. Korean Math. Soc. 30 (2015), no. 3, 277-282 https://doi.org/10.4134/CKMS.2015.30.3.277
- F. Nakaoka and N. Oda, Some applications of minimal open sets, Int. J. Math. Math. Sci. 27 (2001), no. 8, 471-476. https://doi.org/10.1155/S0161171201006482
- F. Nakaoka and N. Oda, Some properties of maximal open sets, Int. J. Math. Math. Sci. 21 (2003), no. 21, 1331-1340.
- F. Nakaoka and N. Oda, Minimal closed sets and maximal closed sets, Int. J. Math. Math. Sci. 2006 (2006), Article ID 18647, 8 pages.
- L. A. Steen and J. A. Seebach Jr., Counterexamples in topology, New York: Holt, Rinehart and Winston Inc., 1970.