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All the ideas for 'English as a Formal Language', 'Logic [1897]' and 'Paradoxes of the Infinite'

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4 ideas

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

9987	An aggregate in which order does not matter I call a 'set' [Bolzano]

5. Theory of Logic / F. Referring in Logic / 2. Descriptions / b. Definite descriptions

18779

'The' is a quantifier, like 'every' and 'a', and does not result in denotation [Montague]

6. Mathematics / A. Nature of Mathematics / 5. The Infinite / a. The Infinite

10856

A truly infinite quantity does not need to be a variable [Bolzano]

13. Knowledge Criteria / C. External Justification / 2. Causal Justification

11052

Psychological logic can't distinguish justification from causes of a belief [Frege]