Colonel William A. Phillips Main menu Main menu move to sidebar hide Navigation Main pageContentsCurrent eventsRandom articleAbout WikipediaContact usDonate Contribute HelpLearn to editCommunity portalRecent changesUpload file Search Search Create account Log in Personal tools Create account Log in Pages for logged out editors learn more ContributionsTalk Contents move to sidebar hide (Top) 1See also Toggle the table of contents 1 language Bahasa Melayu Edit links ArticleTalk English ReadView history Tools Tools move to sidebar hide Actions ReadView history General What links hereRelated changesUpload fileSpecial pagesPermanent linkPage informationCite this pageGet shortened URLDownload QR codeWikidata item Print/export Download as PDFPrintable version In mathematics, exactness may refer to: Exact category Exact functor Landweber exact functor theorem Exact sequence See also Exactness of measurements Accuracy and precision Toggle limited content width