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Bernard BolzanoHis Life and Work$
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Paul Rusnock and Jan Sebestík

Print publication date: 2019

Print ISBN-13: 9780198823681

Published to Oxford Scholarship Online: June 2019

DOI: 10.1093/oso/9780198823681.001.0001

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(p.187) Chapter 6 Logic
Bernard Bolzano

Paul Rusnock

Jan Šebestík

Oxford University Press

Bolzano’s masterwork of theoretical philosophy, the Theory of Science, is devoted to logic in a very broad sense of the word, encompassing not only logic in the narrow sense, but also epistemology, heuristics, scientific methodology, and the art of scientific composition. Chapter 6, the longest of the book, deals with Bolzano’s logic in the narrow sense. After some introductory matter, his notions of propositions and ideas in themselves are examined, along with his decision to define ideas in terms of propositions rather than the other way around. The chapter then presents detailed discussions of his theories of ideas and propositions, his variation logic, and the key notion of ground-consequence, before closing with a brief treatment of the Theory of Science Proper, which deals with the organization and presentation of scientific knowledge.

Keywords:   proposition in itself, idea in itself, intuition, concept, extension, content, variation logic, deducibility, ground and consequence, science

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