Editing Tilde (section)

====As a unary operator====
A tilde in front of a single quantity can mean "approximately", "about"<ref name="bymath1">{{Cite web |title=All Elementary Mathematics – Mathematical symbols dictionary |url=http://www.bymath.com/symbols/symbols.html |publisher=Bymath |accessdate=2014-09-25 |archive-date=2 May 2015 |archive-url=https://web.archive.org/web/20150502113549/http://www.bymath.com/symbols/symbols.html |url-status=dead }}</ref> or "of the same [[order of magnitude]] as."

In written [[mathematical logic]], the tilde represents [[negation]]: "~''p''" means "not ''p''", where "''p''" is a [[proposition]]. Modern use often replaces the tilde with the negation symbol (¬) for this purpose, to avoid confusion with [[equivalence relation]]s.