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11 Cards in this Set
- Front
- Back
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DEDUCTIVELY VALID
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When an argument has an instance of a valid form.
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DEDUCTIVELY VALID (argument form)
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if and only if there are no instances of that form in which all the premises are true and the conclusion false.
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COMPOUND
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When a sentence is logically contains another complete sentence as a component.
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SIMPLE
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When sentence is not a compound
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SENTENTIAL OPERATOR
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is an expression containing blanks such that, when the blanks are filled with complete sentences, the result is a complete sentence.
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TRUTH-FUNCTIONAL
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A sentential operator is TRUTH-FUNCTIONAL if the truth or falsity of a compound sentence containing that operator is completely determined by the truth or falsity of its component sentences.
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COUNTEREXAMPLE
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When an argument form is an instance of that form where all the premises are true and the conclusion false.
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DEDUCTIVELY VALID
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When an argument form iff it has no counterexample.
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Tautology
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statement form is a TAUTOLOGY iff every instance of that form is true; that is, it is true in every row in its truth table.
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Contradiction/Inconsistant
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A statement form is a CONTRADICTION (or inconsistent) iff every instance of that form is false; that is, it is false in every row in its truth table.
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Contingency
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A statement form is a CONTINGENCY iff some instance of that form is true and some is false; that is, it is true in at least one row in its truth table and false in at least one row in its truth table.
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