منابع مشابه
Plato’s theory of forms and the axiom of foundation
By y ⊂ x we mean that z ∈ y implies that z ∈ x. If x is a set, we say that an element y of x is epsilon-minimal if y ∩ x = ∅. The axiom of foundation states that if x 6= ∅ then x has an epsilon-minimal element. See Jech [28, p. 63, Chapter 6]. Zermelo [52]. Translated and glossed in [20, pp. 1208–1233]. Kanamori [29] Ebbinghaus: [17] Forster [21] Von Neumann universe, cumulative hierarchy, -ind...
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1 Department of Clinical and Toxicological Analysis, University of Alfenas-MG, Av. Gabriel Monteiro da Silva, 714, Alfenas, MG, Brazil, 37130.000 2 Laboratory of Industrial Hygiene and Toxicology, University of Brescia, P.le Spedali Civili, 1, 25100, Brescia, Italy 3 Department of Clinical and Toxicological Analysis, Faculty of Pharmaceutical Sciences, University of São Paulo, Av. Lineu Prestes...
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Purple martins are cavity-nesting swallows that once nested fairly widely in California’s oak woodlands but are now rare in that habitat. The old oaks of the Tehachapi Range (southern Sierra Nevada) may now host the last martins that nest in oak woodlands, with approximately 100-200 pairs or about 15 percent of the California population. In summer of 2000, we found 57 nests in 46 valley and blu...
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We investigate the set theoretical strength of some properties of normality, including Urysohn’s Lemma, Tietze-Urysohn Extension Theorem, normality of disjoint unions of normal spaces, and normality of Fσ subsets of normal spaces. Introduction. The notion of a normal topological space has been of interest to topologists for many years. (See, for example, [2], [4], [7], [12], [13], [18], and [20...
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Omar De la Cruz∗1, Eric Hall∗∗2, Paul Howard∗∗∗3, Kyriakos Keremedis†4, and Eleftherios Tachtsis‡5 1 Department of Mathematics, Purdue University, West Lafayette, IN 47907, USA 2 Department of Mathematics and Statistics, University of Missouri, Kansas City, MO 64110, USA 3 Department of Mathematics, Eastern Michigan University, Ypsilanti, MI 48197, USA 4 Department of Mathematics, University of...
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ژورنال
عنوان ژورنال: Notre Dame Journal of Formal Logic
سال: 1990
ISSN: 0029-4527
DOI: 10.1305/ndjfl/1093635503