Introduction to Mathematical Philosophy

by Bertrand Russell

terms; thus it would be possible, if there were no repetitions in the first

classes, to go on with only repetitions from the

class to the

class. But by that time the old terms would no longer be sufficiently numerous to form a next class with the right number of members, i.e.

, therefore new terms must come in at this point if not sooner. It follows that, if we omit from our progression