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| Mirrors > Home > ILE Home > Th. List > limon | 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 4613 | . 2 ⊢ Ord On | |
| 2 | 0elon 4518 | . 2 ⊢ ∅ ∈ On | |
| 3 | unon 4638 | . . 3 ⊢ ∪ On = On | |
| 4 | 3 | eqcomi 2238 | . 2 ⊢ On = ∪ On |
| 5 | dflim2 4496 | . 2 ⊢ (Lim On ↔ (Ord On ∧ ∅ ∈ On ∧ On = ∪ On)) | |
| 6 | 1, 2, 4, 5 | mpbir3an 1206 | 1 ⊢ Lim On |
| Colors of variables: wff set class |
| Syntax hints: = wceq 1398 ∈ wcel 2205 ∅c0 3512 ∪ cuni 3919 Ord word 4488 Oncon0 4489 Lim wlim 4490 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-in1 619 ax-in2 620 ax-io 717 ax-5 1496 ax-7 1497 ax-gen 1498 ax-ie1 1542 ax-ie2 1543 ax-8 1553 ax-10 1554 ax-11 1555 ax-i12 1556 ax-bndl 1558 ax-4 1559 ax-17 1575 ax-i9 1579 ax-ial 1583 ax-i5r 1584 ax-13 2207 ax-14 2208 ax-ext 2216 ax-sep 4233 ax-nul 4241 ax-pow 4292 ax-pr 4327 ax-un 4559 |
| This theorem depends on definitions: df-bi 117 df-3an 1007 df-tru 1401 df-nf 1510 df-sb 1812 df-clab 2221 df-cleq 2227 df-clel 2230 df-nfc 2375 df-ral 2527 df-rex 2528 df-v 2817 df-dif 3216 df-un 3218 df-in 3220 df-ss 3227 df-nul 3513 df-pw 3676 df-sn 3700 df-pr 3701 df-uni 3920 df-tr 4214 df-iord 4492 df-on 4494 df-ilim 4495 df-suc 4497 |
| This theorem is referenced by: (None) |
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