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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 8458 | . 2 class 4o | |
2 | c3o 8457 | . . 3 class 3o | |
3 | 2 | csuc 6357 | . 2 class suc 3o |
4 | 1, 3 | wceq 1533 | 1 wff 4o = suc 3o |
Colors of variables: wff setvar class |
This definition is referenced by: 4on 8481 o2p2e4 8537 4onn 8641 en4 9280 hash4 14368 nlim4 42745 |
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