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| Mirrors > Home > MPE Home > Th. List > df-3o | Structured version Visualization version GIF version | ||
| Description: Define the ordinal number 3. (Contributed by Mario Carneiro, 14-Jul-2013.) |
| Ref | Expression |
|---|---|
| df-3o | ⊢ 3o = suc 2o |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | c3o 8080 | . 2 class 3o | |
| 2 | c2o 8079 | . . 3 class 2o | |
| 3 | 2 | csuc 6161 | . 2 class suc 2o |
| 4 | 1, 3 | wceq 1538 | 1 wff 3o = suc 2o |
| Colors of variables: wff setvar class |
| This definition is referenced by: 3on 8097 o2p2e4 8149 o2p2e4OLD 8150 3onn 8250 en3 8739 hash3 13763 finxp3o 34817 tr3dom 40236 df3o2 40727 df3o3 40728 clsk1independent 40749 |
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