Dual of a Truth-Table and Formulas
The dual of a truth-table involves swapping truth values. Connectives like conjunction…
Doxastic Modal Logic: The Logic of Belief
Doxastic modal logic explores the reasoning behind beliefs. It models how rational…
Downward Löwenheim–Skolem Theorem
The downward Löwenheim–Skolem theorem states that if a theory has an infinite…
Double Turnstile Symbol (⊨) in Logic
The double turnstile (⊨) symbol signifies semantic entailment or logical consequence. It…
Double Negation Introduction
The principle of double negation introduction states that for any proposition P,…
Double Negation Elimination
Double negation elimination is a core principle in classical logic. It states…
Domain of Discourse: Defining the Scope of Logic
The domain of discourse is the set of all objects under consideration…
Understanding the Domain in Mathematics and Logic
The domain defines the set of all permissible inputs for a function…