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Editor�́�s Introduction -- I. Logic as a Theory of Science -- II. Propositions and Sentences -- III. Ideas in Themselves -- IV. The Reduction of Sentences -- V. Judgment and Knowledge -- VI. Intuition and Concept -- VII. The Notion of Variation -- VIII. Analytic and Synthetic Propositions -- IX. Consistency and Derivability -- X. Degree of Validity and Probability -- XI. The Objective Hierarchy of Propositions -- XII. Set and Continuum -- XIII. Infinite Sets -- XIV. Natural Numbers -- XV. Conclusion -- A A Selection from the Wissenschaftslehre (Sulzbach 1837, Leipzig 1914�́�31) [�́�+A�́� (�́�-A�́�) means including (excluding) the Anmerkung(en)]: Volume One -- One / Theory of Fundamental Truths -- One / On the Existence of Truths in Themselves -- Two / On the Possibility of Knowing the Truth -- Two / Theory of Elements ℗ʹ 46. Purpose, Content and Sections of this Part -- One / On Ideas in Themselves -- Volume Two -- Two / On Propositions in Themselves
2. Biographies -- 3. Logic -- 4. Mathematics -- 5. Metaphysics -- 6. Theology -- 7. Social Philosophy -- 8. Aesthetics -- Name Index
The present selection from the Wissenschaftslehre (Sulzbach 1837) of Bernard Bolzano (1781-1848) aims at giving a compact view of his main ideas in logic, semantics, epistemology and the methodology of science. These ideas are analyzed from a modern point of view in the Introduction. Furthermore, excerpts from Bolzano's correspondence are included which yield important remarks on his own work. The translation of the sections from the Wissenschaftslehre are based on a German text, which I have located in the Manuscript Department of the University Library in Prague (signature: 75 B 459). It was one of Bolzano's own copies of his printed work and contains a vast number of corrections made by Bolzano himself, thus representing the final stage of his thought, which has gone unnoticed in previous editions. The German originals of Bolzano's letters to M. J. Fesl, J. P. Romang, R. Zimmermann and F. Pi'ihonsky are in the Literary Archive of the Pamatnfk narodnfho pfsemnictvf in Prague. The original of the letter to F. Exner belongs to the Manuscript Department of the Osterreichische Nationalbibliothek in Vienna. The original of the letter to J. E. Seidel is preserved in the Museum of the City of Ceske Budejovice