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'fragments/reports', 'Principles of Theoretical Logic' and 'Elucidation of some points in E.Schrder'
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4. Formal Logic / C. Predicate Calculus PC / 1. Predicate Calculus PC
17750
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The first clear proof of the consistency of the first order predicate logic was in 1928 [Hilbert/Ackermann, by Walicki]
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4. Formal Logic / F. Set Theory ST / 3. Types of Set / b. Empty (Null) Set
14238
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A class is an aggregate of objects; if you destroy them, you destroy the class; there is no empty class [Frege]
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