|(logic)||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
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]