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In mathematics, in the field of topology, a topological space is said to be a Volterra space if any finite intersection of dense Gδ subsets is dense. Every Baire space is Volterra, but the converse is not true. In fact, any metrizable space is Volterra. The name refers to a paper of Vito Volterra in which he uses the fact that (in modern notation) the intersection of two dense G-delta sets in the real numbers is again dense. ==References== * Cao, Jiling and Gauld, D, "Volterra spaces revisited", ''J. Aust. Math. Soc.'' 79 (2005), 61-76. * Cao, Jiling and Junnila, Heikki, "When is a Volterra space Baire?", ''Topology Appl.'' 154 (2007), 527-532. * Gauld, D. and Piotrowski, Z., "On Volterra spaces", ''Far East J. Math. Sci.'' 1 (1993), 209-214. * Gruenhage, G. and Lutzer, D., "Baire and Volterra spaces", ''Proc. Amer. Math. Soc.'' 128 (2000), 3115-3124. * Volterra, V., "Alcune osservasioni sulle funzioni punteggiate discontinue", ''Giornale di Matematiche'' 19 (1881), 76-86. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Volterra space」の詳細全文を読む スポンサード リンク
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