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| Mirrors > Home > MPE Home > Th. List > fiming | Structured version Visualization version GIF version | ||
| Description: A finite set has a minimum under a total order. (Contributed by AV, 6-Oct-2020.) | 
| Ref | Expression | 
|---|---|
| fiming | ⊢ ((𝑅 Or 𝐴 ∧ 𝐴 ∈ Fin ∧ 𝐴 ≠ ∅) → ∃𝑥 ∈ 𝐴 ∀𝑦 ∈ 𝐴 (𝑥 ≠ 𝑦 → 𝑥𝑅𝑦)) | 
| Step | Hyp | Ref | Expression | 
|---|---|---|---|
| 1 | fimin2g 9538 | . 2 ⊢ ((𝑅 Or 𝐴 ∧ 𝐴 ∈ Fin ∧ 𝐴 ≠ ∅) → ∃𝑥 ∈ 𝐴 ∀𝑦 ∈ 𝐴 ¬ 𝑦𝑅𝑥) | |
| 2 | nesym 2996 | . . . . . . . . 9 ⊢ (𝑥 ≠ 𝑦 ↔ ¬ 𝑦 = 𝑥) | |
| 3 | 2 | imbi1i 349 | . . . . . . . 8 ⊢ ((𝑥 ≠ 𝑦 → 𝑥𝑅𝑦) ↔ (¬ 𝑦 = 𝑥 → 𝑥𝑅𝑦)) | 
| 4 | pm4.64 849 | . . . . . . . 8 ⊢ ((¬ 𝑦 = 𝑥 → 𝑥𝑅𝑦) ↔ (𝑦 = 𝑥 ∨ 𝑥𝑅𝑦)) | |
| 5 | 3, 4 | bitri 275 | . . . . . . 7 ⊢ ((𝑥 ≠ 𝑦 → 𝑥𝑅𝑦) ↔ (𝑦 = 𝑥 ∨ 𝑥𝑅𝑦)) | 
| 6 | sotric 5621 | . . . . . . . . 9 ⊢ ((𝑅 Or 𝐴 ∧ (𝑦 ∈ 𝐴 ∧ 𝑥 ∈ 𝐴)) → (𝑦𝑅𝑥 ↔ ¬ (𝑦 = 𝑥 ∨ 𝑥𝑅𝑦))) | |
| 7 | 6 | ancom2s 650 | . . . . . . . 8 ⊢ ((𝑅 Or 𝐴 ∧ (𝑥 ∈ 𝐴 ∧ 𝑦 ∈ 𝐴)) → (𝑦𝑅𝑥 ↔ ¬ (𝑦 = 𝑥 ∨ 𝑥𝑅𝑦))) | 
| 8 | 7 | con2bid 354 | . . . . . . 7 ⊢ ((𝑅 Or 𝐴 ∧ (𝑥 ∈ 𝐴 ∧ 𝑦 ∈ 𝐴)) → ((𝑦 = 𝑥 ∨ 𝑥𝑅𝑦) ↔ ¬ 𝑦𝑅𝑥)) | 
| 9 | 5, 8 | bitrid 283 | . . . . . 6 ⊢ ((𝑅 Or 𝐴 ∧ (𝑥 ∈ 𝐴 ∧ 𝑦 ∈ 𝐴)) → ((𝑥 ≠ 𝑦 → 𝑥𝑅𝑦) ↔ ¬ 𝑦𝑅𝑥)) | 
| 10 | 9 | anassrs 467 | . . . . 5 ⊢ (((𝑅 Or 𝐴 ∧ 𝑥 ∈ 𝐴) ∧ 𝑦 ∈ 𝐴) → ((𝑥 ≠ 𝑦 → 𝑥𝑅𝑦) ↔ ¬ 𝑦𝑅𝑥)) | 
| 11 | 10 | ralbidva 3175 | . . . 4 ⊢ ((𝑅 Or 𝐴 ∧ 𝑥 ∈ 𝐴) → (∀𝑦 ∈ 𝐴 (𝑥 ≠ 𝑦 → 𝑥𝑅𝑦) ↔ ∀𝑦 ∈ 𝐴 ¬ 𝑦𝑅𝑥)) | 
| 12 | 11 | rexbidva 3176 | . . 3 ⊢ (𝑅 Or 𝐴 → (∃𝑥 ∈ 𝐴 ∀𝑦 ∈ 𝐴 (𝑥 ≠ 𝑦 → 𝑥𝑅𝑦) ↔ ∃𝑥 ∈ 𝐴 ∀𝑦 ∈ 𝐴 ¬ 𝑦𝑅𝑥)) | 
| 13 | 12 | 3ad2ant1 1133 | . 2 ⊢ ((𝑅 Or 𝐴 ∧ 𝐴 ∈ Fin ∧ 𝐴 ≠ ∅) → (∃𝑥 ∈ 𝐴 ∀𝑦 ∈ 𝐴 (𝑥 ≠ 𝑦 → 𝑥𝑅𝑦) ↔ ∃𝑥 ∈ 𝐴 ∀𝑦 ∈ 𝐴 ¬ 𝑦𝑅𝑥)) | 
| 14 | 1, 13 | mpbird 257 | 1 ⊢ ((𝑅 Or 𝐴 ∧ 𝐴 ∈ Fin ∧ 𝐴 ≠ ∅) → ∃𝑥 ∈ 𝐴 ∀𝑦 ∈ 𝐴 (𝑥 ≠ 𝑦 → 𝑥𝑅𝑦)) | 
| Colors of variables: wff setvar class | 
| Syntax hints: ¬ wn 3 → wi 4 ↔ wb 206 ∧ wa 395 ∨ wo 847 ∧ w3a 1086 ∈ wcel 2107 ≠ wne 2939 ∀wral 3060 ∃wrex 3069 ∅c0 4332 class class class wbr 5142 Or wor 5590 Fincfn 8986 | 
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1794 ax-4 1808 ax-5 1909 ax-6 1966 ax-7 2006 ax-8 2109 ax-9 2117 ax-10 2140 ax-11 2156 ax-12 2176 ax-ext 2707 ax-sep 5295 ax-nul 5305 ax-pr 5431 ax-un 7756 | 
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1542 df-fal 1552 df-ex 1779 df-nf 1783 df-sb 2064 df-mo 2539 df-eu 2568 df-clab 2714 df-cleq 2728 df-clel 2815 df-nfc 2891 df-ne 2940 df-ral 3061 df-rex 3070 df-reu 3380 df-rab 3436 df-v 3481 df-sbc 3788 df-dif 3953 df-un 3955 df-in 3957 df-ss 3967 df-pss 3970 df-nul 4333 df-if 4525 df-pw 4601 df-sn 4626 df-pr 4628 df-op 4632 df-uni 4907 df-br 5143 df-opab 5205 df-tr 5259 df-id 5577 df-eprel 5583 df-po 5591 df-so 5592 df-fr 5636 df-we 5638 df-xp 5690 df-rel 5691 df-cnv 5692 df-co 5693 df-dm 5694 df-rn 5695 df-res 5696 df-ima 5697 df-ord 6386 df-on 6387 df-lim 6388 df-suc 6389 df-iota 6513 df-fun 6562 df-fn 6563 df-f 6564 df-f1 6565 df-fo 6566 df-f1o 6567 df-fv 6568 df-om 7889 df-en 8987 df-fin 8990 | 
| This theorem is referenced by: fiinfg 9540 fiminre 12216 | 
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