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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 8450 | . 2 class 3o | |
| 2 | c2o 8449 | . . 3 class 2o | |
| 3 | 2 | csuc 6366 | . 2 class suc 2o |
| 4 | 1, 3 | wceq 1570 | 1 wff 3o = suc 2o |
| Colors of variables: wff setvar class |
| This definition is used by: ord3 8471 3on 8472 o2p2e4 8528 3onn 8632 en3 9244 hash3 14456 finxp3o 38079 df3o2 44073 df3o3 44074 omcl3g 44094 nlim3 44203 tr3dom 44287 har2o 44305 clsk1independent 44805 |
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