Petr Nigri z Kadaně a jeho pojetí „pomyslného jsoucna“
Petrus Nigri of Kadaň and his conception of ens rationis
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Petrus Nigri (Peter Schwarz) was born in Kadaň, a town in western Bohemia, before 1435, and along with his three brothers joined the Dominican Order in Germany. His academic formation spanned a large part of Europe (Germany, Italy, Spain, Bohemia, Hungary), and he eventually became Rector of the Studium Generale in Buda (1481). Although he is known primarily as an important Medieval Hebraist, his place in the history of philosophy derives from his work: Clipeus thomistarum (before 1474), a philosophical commentary on Porphyry’s Introduction (Isagoge), and a commentary on Aristotle’s Categories in the form of questions. While Nigri’s discussion of the concept of being of reason (Clipeus thomistarum, part I, qq. 3-4) is not original, his work is important for contributing to this concept’s reception, and with it the teaching of Hervaeus Natalis (died 1323) in his treatise De secundis intentionibus, in the transalpine countries. Being of reason (ens rationis) is conceived as one of second intentions. It is not a categorial being, nor is it an intellectual operation, nor is it caused, but is only identifiable by the human intellect. Nigri’s being of reason has no subjective existence, but only an objective character, which differs both from categorial being and from mere nothingness.
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