De Morgan duality reveals the relationship between AND and OR logical operators. It states that negating a conjunction equals the…
Degree-theoretic semantics measures sentence truth in degrees, moving beyond binary true/false. This approach is vital for fuzzy logic and theories…
Deflationism posits that 'true' has no substantive property. Its role is primarily linguistic, enabling assertions and endorsements without implying a…
Two theories are deductively equivalent if they can prove the exact same set of theorems. This means they offer the…
Deductive consequence, also known as syntactic consequence, refers to the relationship where a conclusion logically follows from premises based solely…
The deduction theorem states that if a statement can be derived from a set of premises plus an additional statement,…
Deduction is a logical process moving from general premises to a specific, certain conclusion. If premises are true, the conclusion…
A decision procedure is a systematic algorithm that determines if statements are theorems or non-theorems within a logical system. It…
A fundamental procedure in proof theory that systematically removes 'cuts' from a proof. This process simplifies proofs and demonstrates that…
A cut rule in proof theory introduces an intermediate conclusion within a deductive proof. This intermediate step is then utilized…