True or false A sentence is a tautology if it is true on at least one interpretation. A sentence is a contradiction if it is false on at least one interpretation. A sentence is contingent if it is true on at least one interpretation and false on at least one interpretation. The premises of a sound argument must be consistent.
Added by Jerry M.
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So, the first statement is false. Second, a sentence is a contradiction if it is false on all interpretations, not just one. So, the second statement is also false. Show more…
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