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<article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" article-type="other" dtd-version="1.2" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">Discrete and Continuous Models and Applied Computational Science</journal-id><journal-title-group><journal-title xml:lang="en">Discrete and Continuous Models and Applied Computational Science</journal-title><trans-title-group xml:lang="ru"><trans-title>Discrete and Continuous Models and Applied Computational Science</trans-title></trans-title-group></journal-title-group><issn publication-format="print">2658-4670</issn><issn publication-format="electronic">2658-7149</issn><publisher><publisher-name xml:lang="en">Peoples' Friendship University of Russia named after Patrice Lumumba (RUDN University)</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">8671</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Articles</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Статьи</subject></subj-group><subj-group subj-group-type="article-type"><subject></subject></subj-group></article-categories><title-group><article-title xml:lang="en">On Simply-Open Sets</article-title><trans-title-group xml:lang="ru"><trans-title>О просто-открытых множествах</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Kljushin</surname><given-names>V L</given-names></name><name xml:lang="ru"><surname>Клюшин</surname><given-names>Владимир Леонидович</given-names></name></name-alternatives><bio xml:lang="en">Кафедра высшей математики; Российский университет дружбы народов; Peoples Friendship University of Russia</bio><bio xml:lang="ru">Кафедра высшей математики; Российский университет дружбы народов</bio><email>vklyushin@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Jalal Hatem Hussein Al bayati</surname><given-names>-</given-names></name><name xml:lang="ru"><surname>Джелал Хатем Хуссейн Аль Баяти</surname><given-names>-</given-names></name></name-alternatives><bio xml:lang="en">Кафедра высшей математики; Российский университет дружбы народов; Peoples Friendship University of Russia</bio><bio xml:lang="ru">Кафедра высшей математики; Российский университет дружбы народов</bio><email>jalalintuch@yahoo.com</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Peoples Friendship University of Russia</institution></aff><aff><institution xml:lang="ru">Российский университет дружбы народов</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2011-03-15" publication-format="electronic"><day>15</day><month>03</month><year>2011</year></pub-date><issue>3</issue><issue-title xml:lang="en">NO3 (2011)</issue-title><issue-title xml:lang="ru">№3 (2011)</issue-title><fpage>34</fpage><lpage>38</lpage><history><date date-type="received" iso-8601-date="2016-09-08"><day>08</day><month>09</month><year>2016</year></date></history><permissions><copyright-statement xml:lang="ru">Copyright ©; 2011, Клюшин В.Л., Джелал Хатем Хуссейн Аль Баяти -.</copyright-statement><copyright-year>2011</copyright-year><copyright-holder xml:lang="ru">Клюшин В.Л., Джелал Хатем Хуссейн Аль Баяти -.</copyright-holder><ali:free_to_read xmlns:ali="http://www.niso.org/schemas/ali/1.0/"/><license><ali:license_ref xmlns:ali="http://www.niso.org/schemas/ali/1.0/">http://creativecommons.org/licenses/by/4.0</ali:license_ref></license></permissions><self-uri xlink:href="https://journals.rudn.ru/miph/article/view/8671">https://journals.rudn.ru/miph/article/view/8671</self-uri><abstract xml:lang="en">The aim of this paper is to continue study of simply-open sets, and we give some properties of simply-open sets. And we investigate the relations between simply-open sets and other forms of generalized open sets in a topological space like semi-open sets α-sets δ-sets preopen sets semi-preopen sets, and we give some properties of the class of all simply-open sets.</abstract><trans-abstract xml:lang="ru">В статье изучаются множества, являющиеся объединениями открытых и нигде не плотных множеств. Такие множества называются просто-открытыми. Установлены связи просто-открытых множеств с регулярно-открытыми, локально-замкнутыми, полуоткрытыми множествами, α-множествами. Доказано, что класс просто-открытых множеств совпадает с классом δ-множеств.</trans-abstract><kwd-group xml:lang="en"><kwd>simply-open set</kwd><kwd>semi-open set</kwd><kwd>locally closed set</kwd><kwd>locally open set</kwd><kwd>δ-set</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>просто-открытое множество</kwd><kwd>полуоткрытое множество</kwd><kwd>регулярно-открытое множество</kwd><kwd>локально-замкнутое множество</kwd><kwd>δ-множество</kwd></kwd-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Sundaram P., Balachandran K. Semi Generalized Locally Closed Sets in Topological Spaces. Preprint.</mixed-citation></ref><ref id="B2"><label>2.</label><mixed-citation>Dub K. K., Chae G. L., Pan war O. S. Some Properties of "S-Connectedness Between Sets" and "Set S-Connected Mappings" // Indian J. Pure Appl. Math. - 1984. - Vol. 15(4). - Pp. 343-354.</mixed-citation></ref><ref id="B3"><label>3.</label><mixed-citation>Nour T. M. 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