Free Logic
Free logic is a formal system that permits terms without existing referents,…
First-Degree Entailment (FDE)
FDE is a logical system that allows propositions to be both true…
Explosion Principle in Logic
The Explosion Principle, also known as ex falso quodlibet, states that from…
Ex Falso Quodlibet: The Principle of Explosion
Ex falso quodlibet, or the principle of explosion, is a logical tenet…
The Law of Excluded Middle
The law of excluded middle states that for any proposition, it is…
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…
Double Negation
Double negation is the logical principle where applying negation twice to a…
Disjunctive Syllogism
A valid deductive argument form where if a disjunction (P or Q)…
Disjunction Property
The disjunction property in intuitionistic logic asserts that if a statement P…