翻訳と辞書 Words near each other ・ Numangatini Tione Ariki ・ Numanggang language ・ Numanlar, Kastamonu ・ Numanohata Station ・ Numanosawa Station ・ Null modem ・ Null morpheme ・ Null move ・ Null Object pattern ・ Null pointer ・ Null result ・ Null route ・ Null semigroup ・ Null session ・ Null set ・ Null sign ・ Null Stern Hotel ・ Null Subject Parameter ・ Null symbol ・ Null vector ・ Null vector (disambiguation) ・ Null-A Three ・ Null-move heuristic ・ Null-O ・ Null-subject language ・ Null-terminated string ・ Nulla bona ・ Nulla in mundo pax sincera ・ Nulla poena pro vitium Abyssus ・ Nulla poena sine lege Dictionary Lists mini英和辞書 mini和英辞書 Webster 1913 Latin-English FOLDOC Wikipedia English ウィキペディア

翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Null sign ： ウィキペディア英語版 Null sign In mathematics, the null sign ((unicode:∅)) denotes the empty set. Common notations for the empty set include "{}", "∅", and "$\backslash emptyset$". The latter two symbols were introduced by the Bourbaki group (specifically André Weil) in 1939, inspired by the letter Ø in the Norwegian and Danish alphabets (and not related in any way to the Greek letter Φ).〔(Earliest Uses of Symbols of Set Theory and Logic. )〕 In linguistics, the null sign is used to indicate the absence of an element, such as a sound or morpheme. It is also used in distinguishing the symbol null from zero (0). ==History of Null Sign== Sets become a mathematical branch in the early years.An argument was held by the mathematicians on how to distinguish a set that has no elements in it.They suggested the letter "O",but mathematicians disagreed because O can be an element.Zero is also a choice but the same thing with O,it can be an element.So the group invented the slashed zero or slashed O.(∅) 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「Null sign」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.