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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 8424 | . 2 ⊢ 1o ∈ On | |
2 | nlimsuc 41703 | . . 3 ⊢ (1o ∈ On → ¬ Lim suc 1o) | |
3 | df-2o 8413 | . . . 4 ⊢ 2o = suc 1o | |
4 | limeq 6329 | . . . 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 328 | . 2 ⊢ (1o ∈ On → ¬ Lim 2o) |
7 | 1, 6 | ax-mp 5 | 1 ⊢ ¬ Lim 2o |
Colors of variables: wff setvar class |
Syntax hints: ¬ wn 3 ↔ wb 205 = wceq 1541 ∈ wcel 2106 Oncon0 6317 Lim wlim 6318 suc csuc 6319 1oc1o 8405 2oc2o 8406 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1913 ax-6 1971 ax-7 2011 ax-8 2108 ax-9 2116 ax-ext 2707 ax-sep 5256 ax-nul 5263 ax-pr 5384 |
This theorem depends on definitions: df-bi 206 df-an 397 df-or 846 df-3or 1088 df-3an 1089 df-tru 1544 df-fal 1554 df-ex 1782 df-sb 2068 df-clab 2714 df-cleq 2728 df-clel 2814 df-ne 2944 df-ral 3065 df-rex 3074 df-rab 3408 df-v 3447 df-dif 3913 df-un 3915 df-in 3917 df-ss 3927 df-pss 3929 df-nul 4283 df-if 4487 df-pw 4562 df-sn 4587 df-pr 4589 df-op 4593 df-uni 4866 df-br 5106 df-opab 5168 df-tr 5223 df-eprel 5537 df-po 5545 df-so 5546 df-fr 5588 df-we 5590 df-ord 6320 df-on 6321 df-lim 6322 df-suc 6323 df-1o 8412 df-2o 8413 |
This theorem is referenced by: (None) |
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