Word Count : 234

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A tautology is a logical statement that is always true, regardless of the truth values of the components involved. It is a formula that is valid in all possible interpretations. For example, the statement "P ∨ ¬P" (P or not P) is a tautology because, for _______ ________ _____ __________ _____ _______ ________.
___ ___ _______ _____ ____ ______ ___.
________ ___ ______ __________ _____ ______ _________ __________ __________ _________ ______ __________.
_______ ___ _____ ________ ___ ______ ___ ______ __________ ___ ________ ___.
____ ___ _____ ___ _______.
________ _____ ____ ____ _____ ______ __________ _________ ______ _______ ____ _________.
_________ __________ _____ _________ ___ _________ ______ _____ __________ ________.
_____ _______ ________ ________ ______ _____ _____ ________ __________ _______ ________.
______ __________ _________ _________ _______ _____ _____ ______ ____ __________ ______.
_____ ___ _________ _______ ___.
____ _________ _________ _____ _____ __________.
__________ ____ _____ ______ _____ __________ ____ __________ ________ ____ ________.
__________ _____ _________ ____ ____.
________ ________ _____ __________ ________ __________.
_______ ______ _______ ____ ______ ________ _______ _____ ___ _________.
_________ _____ __________ _________ _________ ____ ________ ________ ____ ___.
__________ ________ _____ _____ ____ _________ _________ _____ ____ ___.
_____ _______ ____ ___ ____ ______ _________ _____ _________ _____ ______ ____.
___ _____ ______ ______ _______ _________.
________ _______ ___ ___ ________ _________ ______ ______ _______ ________ __________.
__________ ___ ____ ____ _________ _____.
_________ ______ __________.
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