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| Mirrors > Home > MPE Home > Th. List > Mathboxes > nlim2NEW | Structured version Visualization version GIF version | ||
| Description: 2 is not a limit ordinal. (Contributed by BTernaryTau, 1-Dec-2024.) (Proof shortened by RP, 13-Dec-2024.) |
| Ref | Expression |
|---|---|
| nlim2NEW | ⊢ ¬ Lim 2o |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | 1on 8493 | . 2 ⊢ 1o ∈ On | |
| 2 | nlimsuc 44536 | . . 3 ⊢ (1o ∈ On → ¬ Lim suc 1o) | |
| 3 | df-2o 8481 | . . . 4 ⊢ 2o = suc 1o | |
| 4 | limeq 6374 | . . . 4 ⊢ (2o = suc 1o → (Lim 2o ↔ Lim suc 1o)) | |
| 5 | 3, 4 | ax-mp 5 | . . 3 ⊢ (Lim 2o ↔ Lim suc 1o) |
| 6 | 2, 5 | sylnibr 332 | . 2 ⊢ (1o ∈ On → ¬ Lim 2o) |
| 7 | 1, 6 | ax-mp 5 | 1 ⊢ ¬ Lim 2o |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: ¬ wn 3 ↔ wb 209 = wceq 1569 ∈ wcel 2144 Oncon0 6362 Lim wlim 6363 suc csuc 6364 1oc1o 8473 2oc2o 8474 |
| 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 |
| 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 df-1o 8480 df-2o 8481 |
| This theorem is used by: (None) |
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