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Mirrors > Home > MPE Home > Th. List > nlt1pi | Structured version Visualization version GIF version |
Description: No positive integer is less than one. (Contributed by NM, 23-Mar-1996.) (New usage is discouraged.) |
Ref | Expression |
---|---|
nlt1pi | ⊢ ¬ 𝐴 <N 1o |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | elni 10287 | . . . 4 ⊢ (𝐴 ∈ N ↔ (𝐴 ∈ ω ∧ 𝐴 ≠ ∅)) | |
2 | 1 | simprbi 500 | . . 3 ⊢ (𝐴 ∈ N → 𝐴 ≠ ∅) |
3 | noel 4247 | . . . . . 6 ⊢ ¬ 𝐴 ∈ ∅ | |
4 | 1pi 10294 | . . . . . . . . . 10 ⊢ 1o ∈ N | |
5 | ltpiord 10298 | . . . . . . . . . 10 ⊢ ((𝐴 ∈ N ∧ 1o ∈ N) → (𝐴 <N 1o ↔ 𝐴 ∈ 1o)) | |
6 | 4, 5 | mpan2 690 | . . . . . . . . 9 ⊢ (𝐴 ∈ N → (𝐴 <N 1o ↔ 𝐴 ∈ 1o)) |
7 | df-1o 8085 | . . . . . . . . . . 11 ⊢ 1o = suc ∅ | |
8 | 7 | eleq2i 2881 | . . . . . . . . . 10 ⊢ (𝐴 ∈ 1o ↔ 𝐴 ∈ suc ∅) |
9 | elsucg 6226 | . . . . . . . . . 10 ⊢ (𝐴 ∈ N → (𝐴 ∈ suc ∅ ↔ (𝐴 ∈ ∅ ∨ 𝐴 = ∅))) | |
10 | 8, 9 | syl5bb 286 | . . . . . . . . 9 ⊢ (𝐴 ∈ N → (𝐴 ∈ 1o ↔ (𝐴 ∈ ∅ ∨ 𝐴 = ∅))) |
11 | 6, 10 | bitrd 282 | . . . . . . . 8 ⊢ (𝐴 ∈ N → (𝐴 <N 1o ↔ (𝐴 ∈ ∅ ∨ 𝐴 = ∅))) |
12 | 11 | biimpa 480 | . . . . . . 7 ⊢ ((𝐴 ∈ N ∧ 𝐴 <N 1o) → (𝐴 ∈ ∅ ∨ 𝐴 = ∅)) |
13 | 12 | ord 861 | . . . . . 6 ⊢ ((𝐴 ∈ N ∧ 𝐴 <N 1o) → (¬ 𝐴 ∈ ∅ → 𝐴 = ∅)) |
14 | 3, 13 | mpi 20 | . . . . 5 ⊢ ((𝐴 ∈ N ∧ 𝐴 <N 1o) → 𝐴 = ∅) |
15 | 14 | ex 416 | . . . 4 ⊢ (𝐴 ∈ N → (𝐴 <N 1o → 𝐴 = ∅)) |
16 | 15 | necon3ad 3000 | . . 3 ⊢ (𝐴 ∈ N → (𝐴 ≠ ∅ → ¬ 𝐴 <N 1o)) |
17 | 2, 16 | mpd 15 | . 2 ⊢ (𝐴 ∈ N → ¬ 𝐴 <N 1o) |
18 | ltrelpi 10300 | . . . . 5 ⊢ <N ⊆ (N × N) | |
19 | 18 | brel 5581 | . . . 4 ⊢ (𝐴 <N 1o → (𝐴 ∈ N ∧ 1o ∈ N)) |
20 | 19 | simpld 498 | . . 3 ⊢ (𝐴 <N 1o → 𝐴 ∈ N) |
21 | 20 | con3i 157 | . 2 ⊢ (¬ 𝐴 ∈ N → ¬ 𝐴 <N 1o) |
22 | 17, 21 | pm2.61i 185 | 1 ⊢ ¬ 𝐴 <N 1o |
Colors of variables: wff setvar class |
Syntax hints: ¬ wn 3 ↔ wb 209 ∧ wa 399 ∨ wo 844 = wceq 1538 ∈ wcel 2111 ≠ wne 2987 ∅c0 4243 class class class wbr 5030 suc csuc 6161 ωcom 7560 1oc1o 8078 Ncnpi 10255 <N clti 10258 |
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 1911 ax-6 1970 ax-7 2015 ax-8 2113 ax-9 2121 ax-10 2142 ax-11 2158 ax-12 2175 ax-ext 2770 ax-sep 5167 ax-nul 5174 ax-pr 5295 ax-un 7441 |
This theorem depends on definitions: df-bi 210 df-an 400 df-or 845 df-3or 1085 df-3an 1086 df-tru 1541 df-ex 1782 df-nf 1786 df-sb 2070 df-mo 2598 df-eu 2629 df-clab 2777 df-cleq 2791 df-clel 2870 df-nfc 2938 df-ne 2988 df-ral 3111 df-rex 3112 df-rab 3115 df-v 3443 df-sbc 3721 df-dif 3884 df-un 3886 df-in 3888 df-ss 3898 df-pss 3900 df-nul 4244 df-if 4426 df-pw 4499 df-sn 4526 df-pr 4528 df-tp 4530 df-op 4532 df-uni 4801 df-br 5031 df-opab 5093 df-tr 5137 df-eprel 5430 df-po 5438 df-so 5439 df-fr 5478 df-we 5480 df-xp 5525 df-ord 6162 df-on 6163 df-lim 6164 df-suc 6165 df-om 7561 df-1o 8085 df-ni 10283 df-lti 10286 |
This theorem is referenced by: indpi 10318 pinq 10338 archnq 10391 |
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