Source : Free On-Line Dictionary of Computing

tautological set
     
         A notion introduced by Florentin Smarandache: An
        element x(T, I, F) belongs more than sure to the {set} M; here
        T, I, F are real subsets representing the truth,
        indeterminacy, and falsity percentages respectively, and
        sup(T)>100.
     
        tautological set are used for universally true propositions
        where no parameter such as time, space, or subjectivity
        influences the truth value.
     
        [{Florentin Smarandache, "A Unifying Field in Logics. /
        Neutrosophy: Neutrosophic Probability, Set, and
        Logic", American Research Press, Rehoboth, 1999
        (http://www.gallup.unm.edu/~smarandache/neut-ad.htm)}]
     
        (1999-11-24)