Ideas from 'Letters to Russell' by Gottlob Frege [1902], by Theme Structure
[found in 'From Frege to Gödel 18791931' (ed/tr Heijenoort,Jean van) [Harvard 1967,0674324498]].
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6. Mathematics / A. Nature of Mathematics / 3. Numbers / g. Real numbers
18253

I wish to go straight from cardinals to reals (as ratios), leaving out the rationals

6. Mathematics / C. Sources of Mathematics / 6. Logicism / a. Early logicism
18166

The loss of my Rule V seems to make foundations for arithmetic impossible

9. Objects / A. Existence of Objects / 2. Abstract Objects / c. Modern abstracta
18269

Logical objects are extensions of concepts, or ranges of values of functions
