what is tautology ? why is contradiction? show that the negation of a tautology is a contradiction and the negative of a contradiction is a tautology.
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A tautology is a statement that is true in virtue of its form. Thus, we don't even have to know what the statement means to know that it is true.
In contrast, a contradiction is a statement that is false in virtue of its form A tautology is true on every row of its truth-table, so when you negate a tautology, the resulting sentence is false on every row of its table. That is, the negation of a tautology is a TT-contradiction.
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