Tautologies :-
Compound propositions that are always true irrespective of the truth values of the individual simple propositions are called tautologies.For example, if A1 = 2 | A2 = 3 | A3 = 5
then the compound proposition "Ai is not divisible by 6" is a tautology.
Some common tautologies defined on universe of discourse X are as follow:
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