Full Idea
Norms (containing one variable) which do not define classes I propose to call 'non-predicative'; those which do define classes I shall call 'predicative'.
Gist of Idea
'Predicative' norms are those which define a class
Source
Bertrand Russell (Difficulties of Transfinite Numbers and Types [1905], p.141)
Book Reference
Russell,Bertrand: 'Essays in Analysis', ed/tr. Lackey,Douglas [George Braziller 1973], p.141
Related Ideas
Idea 21559 We need rules for deciding which norms are predicative (unless none of them are) [Russell]
Idea 21568 A one-variable function is only 'predicative' if it is one order above its arguments [Russell]