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Commit 2022-07-20 01:47 7059323d

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feat(set_theory/zfc/ordinal): transitive sets (#15288) We define transitive sets, as an initial development towards von Neumann ordinals.

Estimated changes

Renamed src/set_theory/zfc.lean to src/set_theory/zfc/basic.lean

added theorem Set.mem_sUnion_of_mem

Created src/set_theory/zfc/ordinal.lean

added theorem Set.is_transitive.sUnion

added theorem Set.is_transitive.subset_of_mem

added def Set.is_transitive

added theorem Set.is_transitive_iff_mem_trans

added theorem Set.is_transitive_iff_sUnion_subset

added theorem Set.is_transitive_iff_subset_powerset