Ontological Assumptions of Plato’s Theory of Ideas according to Hermann Lotze

Wojciech Hanuszkiewicz

New approach to ontological status of Plato’s ideas is one of the most important achievements of Hermann Lotze. In his Logic (1874) Lotze argues that ideas have not existence (being) but are valid as predicates in propositions. The key concept in this lineof thought is validity (Geltung) that expresses one of the modi of reality (Wirklichkeitsweise). Analysis of its ontological assumptions allows to introduce a model of intentionality which combines semantic inferentialism of conceptual contents with non-conceptual determination of the limits of language expression and its rationality.

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Keywords: Hermann Lotze · Plato · ideas · intentionality · semantic inferentialism · non-conceptual content · critique of psychologism

Wojciech Hanuszkiewicz – Ph.D., Assistant Professor at the Department of Philosophy and Sociology, Pedagogical University of Cracow. Main research interests: conceptions of metaphysics in the 19th and 20th century, phenomenology, neo-Kantianism. Author of the monograph Filozofia Hermanna Cohena w perspektywie sporu o jedność metody transcendentalnej [Hermann Cohen’s Philosophy in the Perspektive of the Dispute about theUnity of the Transcendental Method], Warszawa 2011.   »  

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