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Description: Membership well-orders every ordinal. Proposition 7.4 of TakeutiZaring p. 36. (Contributed by NM, 3-Apr-1994)
| Ref | Expression | ||
|---|---|---|---|
| Assertion | ordwe |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | df-ord | ||
| 2 | 1 | simprbi |