necessarily or demonstrably true; "demonstrable truths"
capable of being demonstrated or proved; "obvious lies"; "a demonstrable lack of concern for the general welfare"; "practical truth provable to all men"- Walter Bagehot
introduced from another region and persisting without cultivation
brought about or set up or accepted; especially long established; "the established social order"; "distrust the constituted authority"; "a team established as a member of a major league"; "enjoyed his prestige as an established writer"; "an established precedent"; "the established Church"
shown to be valid beyond a reasonable doubt; "the established facts in the case"
securely established; "an established reputation"; "holds a firm position as the country's leading poet"