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References to 'cumulative hierarchy'
1. alternative definition of cardinality by CWoo
2. class by yark
3. example of universe by rspuzio
4. from Hilbert's tenth problem to G\"{o}del's trichotomy by gribskoff
5. permutation model by ratboy
6. properties of ranks of sets by CWoo
7. Russell's theory of types by Aatu