truth-functions See TRUTH TABLE.

truthlikeness a term introduced by Karl Popper in 1960 to explicate...

truthmaker principle See ARMSTRONG.

truth predicate See SEMANTIC PARADOXES.

truth table a tabular display of one or more truth-functions, truth-functional operators,...

truth-table method See TRUTH TABLE.

truth-value most narrowly, one of the values T (for 'true') or...

truth-value gaps See MANY-VALUED LOGIC, PRESUP-. POSITIO. truth-value semantics, interpretations of formal...

Tsou Yen (350?–270? B.C.), Chinese cosmologist, a member of the Chi-hsia Academy...

Tung Chung-shu (c.179–c.104 B.C.), Chinese philosopher, a Han scholar famous for his...

tu quoque See INFORMAL FALLACY.

Turing degree See DEGREE OF UNSOLVABILITY.

Turing machine an abstract automaton or imagined computer consisting of a finite...

Turing machine functionalism See FUNCTIONALISM.

Turing test See TURING MACHINE.

Turnbull George (1698–1748), Scottish moral sense philosopher and educational theorist. He...

Twardowski See ACT- OBJECT PSYCHOLOGY, POLISH. LOGI. Twin-Earth, a fictitious planet...

tychism (from Greek tyche, 'chance'), Peirce's doctrine that there is absolute...

type See ACTION THEORY, DARWINISM, DETERMIN-. ISM , TYPE THEORY ,...

type physicalism See PHYSICALISM.

types, simple theory of See TYPE THEORY.

types, theory of See TYPE THEORY. type theory, broadly, any theory according to...

type theory, ramified See TYPE THEORY.

type–token distinction as drawn by Peirce, the contrast between a category and...

type-type identity See PHILOSOPHY OF MIND.

tzu jan Chinese term meaning 'naturally', 'spontaneity', or 'so-of-itself'. It is a...

Ubermensch See NIETZSCHE.

Udana See NYAYA-VAISHESIKA.

Unamuno Miguel de (1864–1936), Spanish philosopher, scholar, and writer. Born in...

unary quantifier See PLURALITIVE LOGIC.