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| Mirrors > Home > MPE Home > Th. List > df-4o | Structured version Visualization version GIF version | ||
| Description: Define the ordinal number 4. (Contributed by Mario Carneiro, 14-Jul-2013.) |
| Ref | Expression |
|---|---|
| df-4o | ⊢ 4o = suc 3o |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | c4o 8502 | . 2 class 4o | |
| 2 | c3o 8501 | . . 3 class 3o | |
| 3 | 2 | csuc 6386 | . 2 class suc 3o |
| 4 | 1, 3 | wceq 1540 | 1 wff 4o = suc 3o |
| Colors of variables: wff setvar class |
| This definition is referenced by: 4on 8525 o2p2e4 8579 4onn 8683 en4 9317 hash4 14446 nlim4 43458 |
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