A. MS. notebook
Doctrine of multitudes. Breadth and depth. Reference to Bertrand Russell's Principles of Mathematics in connection with the question, Is a collection which has but a single individual member identical with that individual or not? Cantor's system of ordinal numbers.
Breadth, Cantor Georg, Collections, Depth and breadth, Logic (modal see Modality), Multitude, Number, ordinal notation and analysis, Lowell Lectures, Russell Bertrand