8 relations: Inference, Inverse (logic), Logical equivalence, Proposition, Square of opposition, Syllogistic fallacy, Transposition (logic), Validity.
Inference
Inferences are steps in reasoning, moving from premises to logical consequences.
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Inverse (logic)
In logic, an inverse is a type of conditional sentence which is an immediate inference made from another conditional sentence.
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Logical equivalence
In logic, statements p and q are logically equivalent if they have the same logical content.
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Proposition
The term proposition has a broad use in contemporary analytic philosophy.
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Square of opposition
The square of opposition is a diagram representing the relations between the four basic categorical propositions.
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Syllogistic fallacy
Syllogistic fallacies are formal fallacies that occur in syllogisms.
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Transposition (logic)
In propositional logic, transposition is a valid rule of replacement that permits one to switch the antecedent with the consequent of a conditional statement in a logical proof if they are also both negated.
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Validity
In logic, an argument is valid if and only if it takes a form that makes it impossible for the premises to be true and the conclusion nevertheless to be false.
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Redirects here:
Illicit contrary, Illicit subalternation, Illicit subcontrary, Immediate consequence, Subcontrary, Superaltern, Superalternation.