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Mirrors > Home > MPE Home > Th. List > nnlim | Structured version Visualization version GIF version |
Description: A natural number is not a limit ordinal. (Contributed by NM, 18-Oct-1995.) |
Ref | Expression |
---|---|
nnlim | ⊢ (𝐴 ∈ ω → ¬ Lim 𝐴) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | nnord 7710 | . . 3 ⊢ (𝐴 ∈ ω → Ord 𝐴) | |
2 | ordirr 6277 | . . 3 ⊢ (Ord 𝐴 → ¬ 𝐴 ∈ 𝐴) | |
3 | 1, 2 | syl 17 | . 2 ⊢ (𝐴 ∈ ω → ¬ 𝐴 ∈ 𝐴) |
4 | elom 7705 | . . . 4 ⊢ (𝐴 ∈ ω ↔ (𝐴 ∈ On ∧ ∀𝑥(Lim 𝑥 → 𝐴 ∈ 𝑥))) | |
5 | 4 | simprbi 497 | . . 3 ⊢ (𝐴 ∈ ω → ∀𝑥(Lim 𝑥 → 𝐴 ∈ 𝑥)) |
6 | limeq 6271 | . . . . 5 ⊢ (𝑥 = 𝐴 → (Lim 𝑥 ↔ Lim 𝐴)) | |
7 | eleq2 2827 | . . . . 5 ⊢ (𝑥 = 𝐴 → (𝐴 ∈ 𝑥 ↔ 𝐴 ∈ 𝐴)) | |
8 | 6, 7 | imbi12d 345 | . . . 4 ⊢ (𝑥 = 𝐴 → ((Lim 𝑥 → 𝐴 ∈ 𝑥) ↔ (Lim 𝐴 → 𝐴 ∈ 𝐴))) |
9 | 8 | spcgv 3532 | . . 3 ⊢ (𝐴 ∈ ω → (∀𝑥(Lim 𝑥 → 𝐴 ∈ 𝑥) → (Lim 𝐴 → 𝐴 ∈ 𝐴))) |
10 | 5, 9 | mpd 15 | . 2 ⊢ (𝐴 ∈ ω → (Lim 𝐴 → 𝐴 ∈ 𝐴)) |
11 | 3, 10 | mtod 197 | 1 ⊢ (𝐴 ∈ ω → ¬ Lim 𝐴) |
Colors of variables: wff setvar class |
Syntax hints: ¬ wn 3 → wi 4 ∀wal 1537 = wceq 1539 ∈ wcel 2106 Ord word 6258 Oncon0 6259 Lim wlim 6260 ωcom 7702 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1798 ax-4 1812 ax-5 1913 ax-6 1971 ax-7 2011 ax-8 2108 ax-9 2116 ax-ext 2709 ax-sep 5221 ax-nul 5228 ax-pr 5350 |
This theorem depends on definitions: df-bi 206 df-an 397 df-or 845 df-3an 1088 df-tru 1542 df-fal 1552 df-ex 1783 df-sb 2068 df-clab 2716 df-cleq 2730 df-clel 2816 df-ne 2944 df-ral 3069 df-rex 3070 df-rab 3073 df-v 3431 df-dif 3889 df-un 3891 df-in 3893 df-ss 3903 df-nul 4257 df-if 4460 df-pw 4535 df-sn 4562 df-pr 4564 df-op 4568 df-uni 4840 df-br 5074 df-opab 5136 df-tr 5191 df-eprel 5490 df-po 5498 df-so 5499 df-fr 5539 df-we 5541 df-ord 6262 df-on 6263 df-lim 6264 df-om 7703 |
This theorem is referenced by: omssnlim 7717 nnsuc 7720 cantnfp1lem2 9424 cantnflem1 9434 cnfcom2lem 9446 1oequni2o 35547 finxp1o 35571 finxpreclem4 35573 |
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