Journal of Advanced Studies in Topology <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> en-US <p>No manuscript should be submitted which has previously been published, or which has been simultaneously submitted for publication elsewhere. The copyright in a published article rests solely with the Modern Science Publishers, and the paper may not be reproduced in whole in part by any means whatsoever without prior written permission.</p> (A. Ghareeb) Thu, 03 Oct 2019 14:30:37 +0000 OJS 60 Semi-separation axioms on invertible and semi-invertible spaces <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> Neethu M, Anjaly Jose Copyright (c) 2019 Modern Science Publishers Thu, 03 Oct 2019 14:22:32 +0000 More on \(P\)-closed spaces <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> Terrence A. Edwards, James E. Joseph, Bhamini M.P. Nayar Copyright (c) 2019 Modern Science Publishers Sat, 09 Nov 2019 21:25:30 +0000