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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 8475 | . 2 ⊢ 1o ∈ On | |
| 2 | nlimsuc 44200 | . . 3 ⊢ (1o ∈ On → ¬ Lim suc 1o) | |
| 3 | df-2o 8463 | . . . 4 ⊢ 2o = suc 1o | |
| 4 | limeq 6379 | . . . 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 1570 ∈ wcel 2146 Oncon0 6367 Lim wlim 6368 suc csuc 6369 1oc1o 8455 2oc2o 8456 |
| 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 1943 ax-6 2000 ax-7 2041 ax-8 2148 ax-9 2156 ax-ext 2738 ax-sep 5262 ax-nul 5274 ax-pr 5409 |
| 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 2100 df-clab 2745 df-cleq 2758 df-clel 2841 df-ne 2962 df-ral 3083 df-rex 3093 df-rab 3420 df-v 3460 df-dif 3911 df-un 3913 df-in 3915 df-ss 3925 df-pss 3928 df-nul 4290 df-if 4493 df-pw 4569 df-sn 4595 df-pr 4597 df-op 4601 df-uni 4878 df-br 5115 df-opab 5179 df-tr 5224 df-eprel 5566 df-po 5574 df-so 5575 df-fr 5619 df-we 5621 df-ord 6370 df-on 6371 df-lim 6372 df-suc 6373 df-1o 8462 df-2o 8463 |
| This theorem is used by: (None) |
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