http://m-sciences.com/index.php?journal=jast&page=issue&op=feed Journal of Advanced Studies in Topology 2019-11-09T21:36:40+00:00 A. Ghareeb jast@m-sciences.com Open Journal Systems <p style="text-align: justify;">The Journal of Advanced Studies in Topology (<strong>JAST</strong>) is dedicated to rapid publication of the highest quality short papers, regular papers, and expository papers.<span class="Apple-converted-space">&nbsp;</span><strong>JAST</strong><span class="Apple-converted-space">&nbsp;</span>is a peer-reviewed international journal, which publishes original research papers and survey articles in all aspects of topology and its applications.</p> http://m-sciences.com/index.php?journal=jast&page=article&op=view&path%5B%5D=1575 Semi-separation axioms on invertible and semi-invertible spaces 2019-10-03T14:23:28+00:00 Neethu M neethu.mohan95@gmail.com Anjaly Jose anjalyjosecms@gmail.com <p>In this paper we introduce the concept of semi-invertibility with respect to a semi-open set. Here we examine some semi-separation axioms which are carried from subspaces to parent spaces with the help of invertibility and semi-invertibility. Also we study these properties on completely invertible and completely semi-invertible spaces.</p> 2019-10-03T14:22:32+00:00 Copyright (c) 2019 Modern Science Publishers http://m-sciences.com/index.php?journal=jast&page=article&op=view&path%5B%5D=1580 More on \(P\)-closed spaces 2019-11-09T21:36:40+00:00 Terrence A. Edwards tedwards@udc.edu James E. Joseph j122437@yahoo.com Bhamini M.P. Nayar bhaminin@yahoo.com <p>In [1] the following problems were listed as open: Problem 14. Is a regular space in which every closed subset is regular-closed compact? Problem 15. Is a Urysohn-space in which every closed subset is Urysohnclosed compact? To answer the question for Hausdorff-closed spaces in the affirmative, M. H. Stone [12] used Boolean rings and M. KatĖ‡etov [10] used topological methods. In this article, all three questions are answered affirmatively using filters.</p> 2019-11-09T21:25:30+00:00 Copyright (c) 2019 Modern Science Publishers