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Published online by Cambridge University Press: 03 November 2016
* When we speak of a class, we do not assume any particular order of the elements. A “ series “ is an ordered class.
† On p. 12 we read of the “arithmetics of ordinalia “ (the laws of operation with ordinal numbers).
‡ Presumably are is meant. The theorem is Cantor’s (Math. Ann. xx. 1882, p. 117).