The universal introduction rule in predicate logic allows inferring a general statement about all members of a category. This is…
Universal elimination is a fundamental rule of inference in predicate logic. It permits inferring a specific instance from a general…
Transposition is a fundamental logical rule enabling the transformation of a conditional statement P → Q into its contrapositive ¬…
A structural rule in logic, particularly proof theory, governs the manipulation of sequent components. It operates without regard to the…
A fundamental principle in formal logic that permits substituting logically equivalent expressions within proofs. This ensures the argument's validity is…
A rule of inference is a logical structure that allows deriving a conclusion from a set of premises. It's fundamental…
Permutation is a structural rule in logic that enables the exchange of two formulas on the same side of an…
Obversion is a logical operation transforming a categorical proposition into an equivalent statement. It involves negating the predicate and changing…
Negation introduction is a natural deduction rule enabling the derivation of negation. It typically involves assuming the opposite and deriving…
The necessitation rule in modal logic states that if a proposition is provable (a theorem), then its necessity is also…