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| Mirrors > Home > MPE Home > Th. List > fiminre | Structured version Visualization version GIF version | ||
| Description: A nonempty finite set of real numbers has a minimum. Analogous to fimaxre 12138. (Contributed by AV, 9-Aug-2020.) (Proof shortened by Steven Nguyen, 3-Jun-2023.) |
| Ref | Expression |
|---|---|
| fiminre | ⊢ ((𝐴 ⊆ ℝ ∧ 𝐴 ∈ Fin ∧ 𝐴 ≠ ∅) → ∃𝑥 ∈ 𝐴 ∀𝑦 ∈ 𝐴 𝑥 ≤ 𝑦) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | ltso 11265 | . . . 4 ⊢ < Or ℝ | |
| 2 | soss 5577 | . . . 4 ⊢ (𝐴 ⊆ ℝ → ( < Or ℝ → < Or 𝐴)) | |
| 3 | 1, 2 | mpi 20 | . . 3 ⊢ (𝐴 ⊆ ℝ → < Or 𝐴) |
| 4 | fiming 9448 | . . 3 ⊢ (( < Or 𝐴 ∧ 𝐴 ∈ Fin ∧ 𝐴 ≠ ∅) → ∃𝑥 ∈ 𝐴 ∀𝑦 ∈ 𝐴 (𝑥 ≠ 𝑦 → 𝑥 < 𝑦)) | |
| 5 | 3, 4 | syl3an1 1177 | . 2 ⊢ ((𝐴 ⊆ ℝ ∧ 𝐴 ∈ Fin ∧ 𝐴 ≠ ∅) → ∃𝑥 ∈ 𝐴 ∀𝑦 ∈ 𝐴 (𝑥 ≠ 𝑦 → 𝑥 < 𝑦)) |
| 6 | ssel2 3933 | . . . . . . . . 9 ⊢ ((𝐴 ⊆ ℝ ∧ 𝑥 ∈ 𝐴) → 𝑥 ∈ ℝ) | |
| 7 | 6 | adantr 484 | . . . . . . . 8 ⊢ (((𝐴 ⊆ ℝ ∧ 𝑥 ∈ 𝐴) ∧ 𝑦 ∈ 𝐴) → 𝑥 ∈ ℝ) |
| 8 | ssel2 3933 | . . . . . . . . 9 ⊢ ((𝐴 ⊆ ℝ ∧ 𝑦 ∈ 𝐴) → 𝑦 ∈ ℝ) | |
| 9 | 8 | adantlr 725 | . . . . . . . 8 ⊢ (((𝐴 ⊆ ℝ ∧ 𝑥 ∈ 𝐴) ∧ 𝑦 ∈ 𝐴) → 𝑦 ∈ ℝ) |
| 10 | 7, 9 | leloed 11328 | . . . . . . 7 ⊢ (((𝐴 ⊆ ℝ ∧ 𝑥 ∈ 𝐴) ∧ 𝑦 ∈ 𝐴) → (𝑥 ≤ 𝑦 ↔ (𝑥 < 𝑦 ∨ 𝑥 = 𝑦))) |
| 11 | orcom 881 | . . . . . . . 8 ⊢ ((𝑥 = 𝑦 ∨ 𝑥 < 𝑦) ↔ (𝑥 < 𝑦 ∨ 𝑥 = 𝑦)) | |
| 12 | 11 | a1i 11 | . . . . . . 7 ⊢ (((𝐴 ⊆ ℝ ∧ 𝑥 ∈ 𝐴) ∧ 𝑦 ∈ 𝐴) → ((𝑥 = 𝑦 ∨ 𝑥 < 𝑦) ↔ (𝑥 < 𝑦 ∨ 𝑥 = 𝑦))) |
| 13 | neor 3051 | . . . . . . . 8 ⊢ ((𝑥 = 𝑦 ∨ 𝑥 < 𝑦) ↔ (𝑥 ≠ 𝑦 → 𝑥 < 𝑦)) | |
| 14 | 13 | a1i 11 | . . . . . . 7 ⊢ (((𝐴 ⊆ ℝ ∧ 𝑥 ∈ 𝐴) ∧ 𝑦 ∈ 𝐴) → ((𝑥 = 𝑦 ∨ 𝑥 < 𝑦) ↔ (𝑥 ≠ 𝑦 → 𝑥 < 𝑦))) |
| 15 | 10, 12, 14 | 3bitr2d 309 | . . . . . 6 ⊢ (((𝐴 ⊆ ℝ ∧ 𝑥 ∈ 𝐴) ∧ 𝑦 ∈ 𝐴) → (𝑥 ≤ 𝑦 ↔ (𝑥 ≠ 𝑦 → 𝑥 < 𝑦))) |
| 16 | 15 | biimprd 250 | . . . . 5 ⊢ (((𝐴 ⊆ ℝ ∧ 𝑥 ∈ 𝐴) ∧ 𝑦 ∈ 𝐴) → ((𝑥 ≠ 𝑦 → 𝑥 < 𝑦) → 𝑥 ≤ 𝑦)) |
| 17 | 16 | ralimdva 3176 | . . . 4 ⊢ ((𝐴 ⊆ ℝ ∧ 𝑥 ∈ 𝐴) → (∀𝑦 ∈ 𝐴 (𝑥 ≠ 𝑦 → 𝑥 < 𝑦) → ∀𝑦 ∈ 𝐴 𝑥 ≤ 𝑦)) |
| 18 | 17 | reximdva 3177 | . . 3 ⊢ (𝐴 ⊆ ℝ → (∃𝑥 ∈ 𝐴 ∀𝑦 ∈ 𝐴 (𝑥 ≠ 𝑦 → 𝑥 < 𝑦) → ∃𝑥 ∈ 𝐴 ∀𝑦 ∈ 𝐴 𝑥 ≤ 𝑦)) |
| 19 | 18 | 3ad2ant1 1147 | . 2 ⊢ ((𝐴 ⊆ ℝ ∧ 𝐴 ∈ Fin ∧ 𝐴 ≠ ∅) → (∃𝑥 ∈ 𝐴 ∀𝑦 ∈ 𝐴 (𝑥 ≠ 𝑦 → 𝑥 < 𝑦) → ∃𝑥 ∈ 𝐴 ∀𝑦 ∈ 𝐴 𝑥 ≤ 𝑦)) |
| 20 | 5, 19 | mpd 15 | 1 ⊢ ((𝐴 ⊆ ℝ ∧ 𝐴 ∈ Fin ∧ 𝐴 ≠ ∅) → ∃𝑥 ∈ 𝐴 ∀𝑦 ∈ 𝐴 𝑥 ≤ 𝑦) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ↔ wb 208 ∧ wa 399 ∨ wo 858 ∧ w3a 1099 ∈ wcel 2144 ≠ wne 2959 ∀wral 3078 ∃wrex 3088 ⊆ wss 3906 ∅c0 4287 class class class wbr 5102 Or wor 5556 Fincfn 8929 ℝcr 11074 < clt 11218 ≤ cle 11219 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1817 ax-4 1831 ax-5 1932 ax-6 1989 ax-7 2030 ax-8 2146 ax-9 2154 ax-10 2177 ax-11 2193 ax-12 2214 ax-ext 2736 ax-sep 5248 ax-nul 5258 ax-pow 5324 ax-pr 5392 ax-un 7720 ax-resscn 11132 ax-pre-lttri 11149 ax-pre-lttrn 11150 |
| This theorem depends on definitions: df-bi 209 df-an 400 df-or 859 df-3or 1100 df-3an 1101 df-tru 1565 df-fal 1575 df-ex 1802 df-nf 1806 df-sb 2093 df-mo 2568 df-eu 2598 df-clab 2743 df-cleq 2756 df-clel 2839 df-nfc 2913 df-ne 2960 df-nel 3064 df-ral 3079 df-rex 3089 df-reu 3370 df-rab 3417 df-v 3458 df-sbc 3747 df-csb 3855 df-dif 3909 df-un 3911 df-in 3913 df-ss 3923 df-pss 3926 df-nul 4288 df-if 4483 df-pw 4559 df-sn 4585 df-pr 4587 df-op 4591 df-uni 4868 df-br 5103 df-opab 5165 df-mpt 5184 df-tr 5210 df-id 5544 df-eprel 5549 df-po 5557 df-so 5558 df-fr 5602 df-we 5604 df-xp 5655 df-rel 5656 df-cnv 5657 df-co 5658 df-dm 5659 df-rn 5660 df-res 5661 df-ima 5662 df-ord 6351 df-on 6352 df-lim 6353 df-suc 6354 df-iota 6479 df-fun 6525 df-fn 6526 df-f 6527 df-f1 6528 df-fo 6529 df-f1o 6530 df-fv 6531 df-om 7849 df-er 8680 df-en 8930 df-dom 8931 df-sdom 8932 df-fin 8933 df-pnf 11220 df-mnf 11221 df-xr 11222 df-ltxr 11223 df-le 11224 |
| This theorem is referenced by: fiminre2 12142 prmgaplem4 17092 aks4d1p5 42702 aks4d1p8 42709 hoidmvlelem2 47175 |
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