Logic Definitions

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Logic

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15 Terms

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Validity

an argument is valid if an only if it is impossible for all premises to be true and the conclusion false

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Tautologically Equivalent

A + B are tautologically equivalent if and only if they have the same truth values on every valuation

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Sound

An argument is sound if an only if it is valid and all of its premises are true

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Jointly Consistent

Sentences are JOINTLY CONSISTENT if and only if it is possible for them all to be true together

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Jointly Inconsistent

Sentences are JOINTLY INCONSISTENT if and only if it is not possible for them all to be true together

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Necessary Truth

A sentence is a NECESSARY TRUTH if and only if it is true and it is not possible for it to be false

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Necessary Falsehood

A sentence is a NECESSARY FALSEHOOD if and only if it is false and not possible for it to be true

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Contingent

A sentence is CONTINGENT if and only if it is possible for it to be true and possible for it to be false

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Tautology

A is a TAUTOLOGY iff it is true on every valuation

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Contradiction

A is a CONTRADICTION iff it is false on every valuation

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Tautologically Equivalent

A and B are TAUTOLOGICALLY EQUIVALENT iff they have the same truth value on every valuation

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Jointly Tautologically Consistent

A1, A2, … An are JOINTLY TAUTOLOGOCALLY CONSISTENT iff there is some valuation that makes them all true

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Jointly Tautologically Inconsistent

A1, A2, … An are JOINTLY TAUTOLOGOCALLY INCONSISTENT iff there is no valuation that makes them all true

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Tautologically Entail

The sentences A1, A2, … An TAUTOLOGOCALLY ENTAIL the sentence C if there is no valuation of the atomic sentences

which makes all of A1, A2, … An true and C false

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