substitutivity
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substitutivity — noun A logical relationship in which two terms can be mutually substituted without affecting the truth value of any propositions in which the terms occur, thereby establishing that the terms are identical. One of the fundamental principles… … Wiktionary
indiscernibility of identicals — noun The principle that if two objects are absolutely identical then they must be indistinguishable from one another with respect to all of their properties. One of the fundamental principles governing identity is that of substitutivity or, as it … Wiktionary
First-order logic — is a formal logical system used in mathematics, philosophy, linguistics, and computer science. It goes by many names, including: first order predicate calculus, the lower predicate calculus, quantification theory, and predicate logic (a less… … Wikipedia
Intentionality — The term intentionality is often simplistically summarised as aboutness . According to the Oxford English Dictionary, it is the distinguishing property of mental phenomena of being necessarily directed upon an object, whether real or imaginary .… … Wikipedia
List of philosophy topics (R-Z) — RRaRabad Rabbinic law Rabbinic theology Francois Rabelais François Rabelais race racetrack paradox racism Gustav Radbruch Janet Radcliffe Richards Sarvepalli Radhakrishnan radical Aristotelianism radical behaviourism radical feminism radical… … Wikipedia
Propositional attitude — A propositional attitude is a relational mental state connecting a person to a proposition. They are often assumed to be the simplest components of thought and can express meanings or content that can be true or false. In being a type of attitude … Wikipedia
Disquotational principle — The disquotational principle is a philosophical theorem which holds that a rational speaker will accept p if and only if he or she believes p. The quotes indicate that the statement p is being treated as a sentence, and not as a proposition. This … Wikipedia
