Free logic is a formal system that permits terms without existing referents, unlike classical logic, which presumes all terms denote…
FDE is a logical system that allows propositions to be both true and false, or neither, rejecting the law of…
The Explosion Principle, also known as ex falso quodlibet, states that from a contradiction, any proposition can be logically derived.…
Ex falso quodlibet, or the principle of explosion, is a logical tenet where any conclusion, true or false, can be…
The law of excluded middle states that for any proposition, it is either true or its negation is true. There…
The principle of double negation introduction states that for any proposition P, P implies the double negation of P (¬¬P).…
Double negation elimination is a core principle in classical logic. It states that a statement preceded by two negations is…
Double negation is the logical principle where applying negation twice to a statement returns the original statement. In classical logic,…
A valid deductive argument form where if a disjunction (P or Q) is true and one disjunct (P) is false,…
The disjunction property in intuitionistic logic asserts that if a statement P or Q is provable, then either P alone…