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Mirrors > Home > MPE Home > Th. List > 1ellim | Structured version Visualization version GIF version |
Description: A limit ordinal contains 1. (Contributed by BTernaryTau, 1-Dec-2024.) |
Ref | Expression |
---|---|
1ellim | ⊢ (Lim 𝐴 → 1o ∈ 𝐴) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | nlim0 6380 | . . . 4 ⊢ ¬ Lim ∅ | |
2 | limeq 6333 | . . . 4 ⊢ (𝐴 = ∅ → (Lim 𝐴 ↔ Lim ∅)) | |
3 | 1, 2 | mtbiri 327 | . . 3 ⊢ (𝐴 = ∅ → ¬ Lim 𝐴) |
4 | 3 | necon2ai 2970 | . 2 ⊢ (Lim 𝐴 → 𝐴 ≠ ∅) |
5 | nlim1 8439 | . . . 4 ⊢ ¬ Lim 1o | |
6 | limeq 6333 | . . . 4 ⊢ (𝐴 = 1o → (Lim 𝐴 ↔ Lim 1o)) | |
7 | 5, 6 | mtbiri 327 | . . 3 ⊢ (𝐴 = 1o → ¬ Lim 𝐴) |
8 | 7 | necon2ai 2970 | . 2 ⊢ (Lim 𝐴 → 𝐴 ≠ 1o) |
9 | limord 6381 | . . 3 ⊢ (Lim 𝐴 → Ord 𝐴) | |
10 | ord1eln01 8446 | . . 3 ⊢ (Ord 𝐴 → (1o ∈ 𝐴 ↔ (𝐴 ≠ ∅ ∧ 𝐴 ≠ 1o))) | |
11 | 9, 10 | syl 17 | . 2 ⊢ (Lim 𝐴 → (1o ∈ 𝐴 ↔ (𝐴 ≠ ∅ ∧ 𝐴 ≠ 1o))) |
12 | 4, 8, 11 | mpbir2and 712 | 1 ⊢ (Lim 𝐴 → 1o ∈ 𝐴) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 205 ∧ wa 397 = wceq 1542 ∈ wcel 2107 ≠ wne 2940 ∅c0 4286 Ord word 6320 Lim wlim 6322 1oc1o 8409 |
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 1914 ax-6 1972 ax-7 2012 ax-8 2109 ax-9 2117 ax-ext 2704 ax-sep 5260 ax-nul 5267 ax-pr 5388 |
This theorem depends on definitions: df-bi 206 df-an 398 df-or 847 df-3or 1089 df-3an 1090 df-tru 1545 df-fal 1555 df-ex 1783 df-sb 2069 df-clab 2711 df-cleq 2725 df-clel 2811 df-ne 2941 df-ral 3062 df-rex 3071 df-rab 3407 df-v 3449 df-dif 3917 df-un 3919 df-in 3921 df-ss 3931 df-pss 3933 df-nul 4287 df-if 4491 df-pw 4566 df-sn 4591 df-pr 4593 df-op 4597 df-uni 4870 df-br 5110 df-opab 5172 df-tr 5227 df-eprel 5541 df-po 5549 df-so 5550 df-fr 5592 df-we 5594 df-ord 6324 df-on 6325 df-lim 6326 df-suc 6327 df-1o 8416 |
This theorem is referenced by: 1onn 8590 |
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