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Jun 12, 2020 at 10:38 history edited CommunityBot
Commonmark migration
Aug 31, 2018 at 9:43 comment added Mauro ALLEGRANZA @TorstenSchoeneberg - Not sets in the "modern" mathematical conception but classes, i.e. "extensions of concepts" (or ideas). Still B.Russell, into the Principles (1903) speaks of classes.
Aug 31, 2018 at 9:39 comment added Torsten Schoeneberg The second quote sounds like preconceiving set theory too.
Aug 31, 2018 at 9:34 history answered Mauro ALLEGRANZA CC BY-SA 4.0