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| Mirrors > Home > MPE Home > Th. List > limon | Structured version Visualization version GIF version | ||
| Description: The class of ordinal numbers is a limit ordinal. (Contributed by NM, 24-Mar-1995.) |
| Ref | Expression |
|---|---|
| limon | ⊢ Lim On |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | ordon 7792 | . 2 ⊢ Ord On | |
| 2 | onn0 6429 | . 2 ⊢ On ≠ ∅ | |
| 3 | unon 7843 | . . 3 ⊢ ∪ On = On | |
| 4 | 3 | eqcomi 2769 | . 2 ⊢ On = ∪ On |
| 5 | df-lim 6367 | . 2 ⊢ (Lim On ↔ (Ord On ∧ On ≠ ∅ ∧ On = ∪ On)) | |
| 6 | 1, 2, 4, 5 | mpbir3an 1360 | 1 ⊢ Lim On |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: = wceq 1569 ≠ wne 2955 ∅c0 4278 ∪ cuni 4866 Ord word 6361 Oncon0 6362 Lim wlim 6363 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1827 ax-4 1841 ax-5 1942 ax-6 1999 ax-7 2040 ax-8 2146 ax-9 2154 ax-ext 2732 ax-sep 5248 ax-nul 5259 ax-pr 5390 ax-un 7752 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3or 1104 df-3an 1105 df-tru 1572 df-fal 1582 df-ex 1812 df-sb 2099 df-clab 2739 df-cleq 2752 df-clel 2835 df-ne 2956 df-ral 3077 df-rex 3087 df-rab 3413 df-v 3452 df-ss 3896 df-pss 4014 df-dif 4047 df-in 4091 df-un 4151 df-nul 4279 df-if 4482 df-pw 4558 df-sn 4585 df-pr 4587 df-op 4835 df-uni 4867 df-br 5103 df-opab 5167 df-tr 5212 df-eprel 5550 df-po 5558 df-so 5559 df-fr 5603 df-we 5605 df-ord 6365 df-on 6366 df-lim 6367 df-suc 6368 |
| This theorem is used by: limom 7894 oesuc 8539 limensuc 9177 limsucncmp 37327 dflim5 44425 |
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