contingent; decidibility; empiricist; extensional; logical empiricist; necessary; neorationalist; nominalist; non-truth-functional; performatives; phenomenology; phenominalism; pragmatics; proper names; propositional logic; psychological egoism; rationalist; realist; Russell's theory of descriptions; syntactics; synthetic; teleological ethics; traditional, scholastic, or aristotelian logic; transcendental; truth theories;