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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 7556 | . 2 class 4𝑜 | |
2 | c3o 7555 | . . 3 class 3𝑜 | |
3 | 2 | csuc 5725 | . 2 class suc 3𝑜 |
4 | 1, 3 | wceq 1483 | 1 wff 4𝑜 = suc 3𝑜 |
Colors of variables: wff setvar class |
This definition is referenced by: 4on 7571 o2p2e4 7621 4onn 7722 en4 8198 hash4 13195 |
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