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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 7823 | . 2 ⊢ Ord On | |
| 2 | onn0 6455 | . 2 ⊢ On ≠ ∅ | |
| 3 | unon 7876 | . . 3 ⊢ ∪ On = On | |
| 4 | 3 | eqcomi 2772 | . 2 ⊢ On = ∪ On |
| 5 | df-lim 6393 | . 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 1570 ≠ wne 2959 ∅c0 4281 ∪ cuni 4872 Ord word 6387 Oncon0 6388 Lim wlim 6389 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1945 ax-6 2002 ax-7 2043 ax-8 2149 ax-9 2157 ax-ext 2735 ax-sep 5255 ax-nul 5266 ax-pr 5398 ax-un 7783 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3or 1104 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-sb 2102 df-clab 2742 df-cleq 2755 df-clel 2839 df-ne 2960 df-ral 3081 df-rex 3091 df-rab 3417 df-v 3456 df-ss 3901 df-pss 4017 df-dif 4050 df-in 4094 df-un 4154 df-nul 4282 df-if 4486 df-pw 4562 df-sn 4589 df-pr 4591 df-op 4841 df-uni 4873 df-br 5109 df-opab 5174 df-tr 5219 df-eprel 5558 df-po 5566 df-so 5567 df-fr 5611 df-we 5613 df-ord 6391 df-on 6392 df-lim 6393 df-suc 6394 |
| This theorem is used by: limom 7927 oesuc 8573 limensuc 9211 limsucncmp 37449 dflim5 44592 |
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