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| Mirrors > Home > MPE Home > Th. List > Mathboxes > nlim1NEW | Structured version Visualization version GIF version | ||
| Description: 1 is not a limit ordinal. (Contributed by BTernaryTau, 1-Dec-2024.) (Proof shortened by RP, 13-Dec-2024.) |
| Ref | Expression |
|---|---|
| nlim1NEW | ⊢ ¬ Lim 1o |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | 0elon 6373 | . 2 ⊢ ∅ ∈ On | |
| 2 | nlimsuc 43889 | . . 3 ⊢ (∅ ∈ On → ¬ Lim suc ∅) | |
| 3 | df-1o 8399 | . . . 4 ⊢ 1o = suc ∅ | |
| 4 | limeq 6330 | . . . 4 ⊢ (1o = suc ∅ → (Lim 1o ↔ Lim suc ∅)) | |
| 5 | 3, 4 | ax-mp 5 | . . 3 ⊢ (Lim 1o ↔ Lim suc ∅) |
| 6 | 2, 5 | sylnibr 329 | . 2 ⊢ (∅ ∈ On → ¬ Lim 1o) |
| 7 | 1, 6 | ax-mp 5 | 1 ⊢ ¬ Lim 1o |
| Colors of variables: wff setvar class |
| Syntax hints: ¬ wn 3 ↔ wb 206 = wceq 1542 ∈ wcel 2114 ∅c0 4274 Oncon0 6318 Lim wlim 6319 suc csuc 6320 1oc1o 8392 |
| 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 1912 ax-6 1969 ax-7 2010 ax-8 2116 ax-9 2124 ax-ext 2709 ax-sep 5232 ax-nul 5242 ax-pr 5371 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3or 1088 df-3an 1089 df-tru 1545 df-fal 1555 df-ex 1782 df-sb 2069 df-clab 2716 df-cleq 2729 df-clel 2812 df-ne 2934 df-ral 3053 df-rex 3063 df-rab 3391 df-v 3432 df-dif 3893 df-un 3895 df-in 3897 df-ss 3907 df-pss 3910 df-nul 4275 df-if 4468 df-pw 4544 df-sn 4569 df-pr 4571 df-op 4575 df-uni 4852 df-br 5087 df-opab 5149 df-tr 5194 df-eprel 5525 df-po 5533 df-so 5534 df-fr 5578 df-we 5580 df-ord 6321 df-on 6322 df-lim 6323 df-suc 6324 df-1o 8399 |
| This theorem is referenced by: (None) |
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