Combining Texts

Ideas for 'Aristotle and Descartes on Matter', 'works' and 'Review of Husserl's 'Phil of Arithmetic''

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4 ideas

4. Formal Logic / B. Propositional Logic PL / 2. Tools of Propositional Logic / e. Axioms of PL

9585	Since every definition is an equation, one cannot define equality itself [Frege]

4. Formal Logic / F. Set Theory ST / 1. Set Theory

13455

Frege did not think of himself as working with sets [Frege, by Hart,WD]

4. Formal Logic / F. Set Theory ST / 3. Types of Set / b. Empty (Null) Set

16895

The null set is indefensible, because it collects nothing [Frege, by Burge]

4. Formal Logic / F. Set Theory ST / 5. Conceptions of Set / c. Logical sets

3328	Frege proposed a realist concept of a set, as the extension of a predicate or concept or function [Frege, by Benardete,JA]