REPOZYTORIUM UNIWERSYTETU
W BIAŁYMSTOKU

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 Tytuł: All Liouville Numbers are Transcendental Autorzy: Korniłowicz, ArturNaumowicz, AdamGrabowski, Adam Słowa kluczowe: Liouville numberDiophantine approximationtranscendental numberLiouville constant Data wydania: 2017 Data dodania: 5-cze-2017 Wydawca: De Gruyter Open Źródło: Formalized Mathematics, Volume 25, Issue 1, pp. 49-54 Abstrakt: In this Mizar article, we complete the formalization of one of the items from Abad and Abad’s challenge list of “Top 100 Theorems” about Liouville numbers and the existence of transcendental numbers. It is item #18 from the “Formalizing 100 Theorems” list maintained by Freek Wiedijk at http://www.cs.ru.nl/F.Wiedijk/100/. Liouville numbers were introduced by Joseph Liouville in 1844 [15] as an example of an object which can be approximated “quite closely” by a sequence of rational numbers. A real number x is a Liouville number iff for every positive integer n, there exist integers p and q such that q > 1 and 0 < x − p q < 1 q n . It is easy to show that all Liouville numbers are irrational. The definition and basic notions are contained in [10], [1], and [12]. Liouvile constant, which is defined formally in [12], is the first explicit transcendental (not algebraic) number, another notable examples are e and π [5], [11], and [4]. Algebraic numbers were formalized with the help of the Mizar system [13] very recently, by Yasushige Watase in [23] and now we expand these techniques into the area of not only pure algebraic domains (as fields, rings and formal polynomials), but also for more settheoretic fields. Finally we show that all Liouville numbers are transcendental, based on Liouville’s theorem on Diophantine approximation. Afiliacja: Korniłowicz Artur - Institute of Informatics, University of Białystok, Białystok, PolandNaumowicz Adam - Institute of Informatics, University of Białystok, Białystok, PolandGrabowski Adam - Institute of Informatics, University of Białystok, Białystok, Poland URI: http://hdl.handle.net/11320/5568 DOI: 10.1515/forma-2017-0004 ISSN: 1426-26301898-9934 Typ Dokumentu: Article Występuje w kolekcji(ach): Artykuły naukowe (IInf)Formalized Mathematics, 2017, Volume 25, Issue 1

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