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All the ideas for 'Letters to Edward Stillingfleet', 'Review of Frege's 'Grundlagen'' and 'Symbolic Logic (with Langford)'

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4 ideas

6. Mathematics / B. Foundations for Mathematics / 5. Definitions of Number / c. Fregean numbers

9992	The 'extension of a concept' in general may be quantitatively completely indeterminate [Cantor]

9. Objects / D. Essence of Objects / 3. Individual Essences

15990

Every individual thing which exists has an essence, which is its internal constitution [Locke]

10. Modality / B. Possibility / 8. Conditionals / a. Conditionals

7803	Modal logic began with translation difficulties for 'If...then' [Lewis,CI, by Girle]

11. Knowledge Aims / B. Certain Knowledge / 1. Certainty

15994

If it is knowledge, it is certain; if it isn't certain, it isn't knowledge [Locke]