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[German Version] I. Terminology The term sign usually means something perceptible to the senses that signifies something else, which gives it its specific meaning. In theological and philosophical usage, it differs from the term symbol (Symbols), although the latter is sometimes used synonymously with sign in semiotics and mathematics as well as in logic. While Aristotle used the term σημεῖον/ sēmeíon in various contexts – including his theory of conclusions –,Augustine of Hippo associated the theory of signs more closely with the theory of language (Phi…

[German Version] I. The Term and Its Impact Though there was scattered use of the term in German historiography (Ernst Bernheim) and 19th-century German and French philosophy (Conrad Herrmann, M. Blondel), the concept and term go back to C.S. Peirce (see also II below), who introduced the concept in How to Make Our Ideas Clear (1878), the term in 1902 in J. Baldwin’s Dictionary of Philosophy and Psychology, and both orally between 1871 and 1873 ¶ in the Metaphysical Club in Cambridge, Massachusetts. He used the term for a logical maxim that the meaning of concepts must…

[German Version] I. Philosophy Rationality is derived from Latin ratio (“calculation, consideration, reason”) and medieval Latin rationalitas…

[German Version] I. Philosophy – II. Philosophy of Religion – III. Ethics – IV. Power of Imagination I. Philosophy Imagination or fantasy (Gk φαντασία/ phantasía, Lat. …

[German Version] I. History The theory or philosophy of science is the theory of the conditions – in particular the structure, acquisition, and explication – of (institutionalized) scientific knowledge(Science); as such it is part of theoretical philosophy. There were already antecedents in antiquity, especially in Plato and Aristotle but also among the Stoics in the distinction (observed into the modern period) between immutable (true) knowledge, (variable) opinion, and belief. In the Middle Ages, as knowledge was institutionalize…

[German Version] I. Natural Sciences The distinction between theory as a consistent linguistic or symbolic system of ordered s…

[German Version] I. Philosophy Realism in a given area B means the ontological thesis that names or terms used in a theory of B refer to things that exist independently of human thought. For example, in natural realism the existence of stones, trees, and ¶ tables is assumed; in scientific realism, that of electrons, force fields, and quarks (see V below); in mathematical realism, that of numbers and quantities; or in ethical realism, that of moral va…