Ideas from 'Difficulties of Transfinite Numbers and Types' by Bertrand Russell [1905], by Theme Structure

[found in 'Essays in Analysis' by Russell,Bertrand (ed/tr Lackey,Douglas) [George Braziller 1973,0-8076-0699-5]].

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6. Mathematics / C. Sources of Mathematics / 10. Constructivism / d. Predicativism
'Predicative' norms are those which define a class
We need rules for deciding which norms are predicative (unless none of them are)