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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 12127. (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 11254 | . . . 4 ⊢ < Or ℝ | |
| 2 | soss 5566 | . . . 4 ⊢ (𝐴 ⊆ ℝ → ( < Or ℝ → < Or 𝐴)) | |
| 3 | 1, 2 | mpi 20 | . . 3 ⊢ (𝐴 ⊆ ℝ → < Or 𝐴) |
| 4 | fiming 9451 | . . 3 ⊢ (( < Or 𝐴 ∧ 𝐴 ∈ Fin ∧ 𝐴 ≠ ∅) → ∃𝑥 ∈ 𝐴 ∀𝑦 ∈ 𝐴 (𝑥 ≠ 𝑦 → 𝑥 < 𝑦)) | |
| 5 | 3, 4 | syl3an1 1163 | . 2 ⊢ ((𝐴 ⊆ ℝ ∧ 𝐴 ∈ Fin ∧ 𝐴 ≠ ∅) → ∃𝑥 ∈ 𝐴 ∀𝑦 ∈ 𝐴 (𝑥 ≠ 𝑦 → 𝑥 < 𝑦)) |
| 6 | ssel2 3941 | . . . . . . . . 9 ⊢ ((𝐴 ⊆ ℝ ∧ 𝑥 ∈ 𝐴) → 𝑥 ∈ ℝ) | |
| 7 | 6 | adantr 480 | . . . . . . . 8 ⊢ (((𝐴 ⊆ ℝ ∧ 𝑥 ∈ 𝐴) ∧ 𝑦 ∈ 𝐴) → 𝑥 ∈ ℝ) |
| 8 | ssel2 3941 | . . . . . . . . 9 ⊢ ((𝐴 ⊆ ℝ ∧ 𝑦 ∈ 𝐴) → 𝑦 ∈ ℝ) | |
| 9 | 8 | adantlr 715 | . . . . . . . 8 ⊢ (((𝐴 ⊆ ℝ ∧ 𝑥 ∈ 𝐴) ∧ 𝑦 ∈ 𝐴) → 𝑦 ∈ ℝ) |
| 10 | 7, 9 | leloed 11317 | . . . . . . 7 ⊢ (((𝐴 ⊆ ℝ ∧ 𝑥 ∈ 𝐴) ∧ 𝑦 ∈ 𝐴) → (𝑥 ≤ 𝑦 ↔ (𝑥 < 𝑦 ∨ 𝑥 = 𝑦))) |
| 11 | orcom 870 | . . . . . . . 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 3017 | . . . . . . . 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 307 | . . . . . 6 ⊢ (((𝐴 ⊆ ℝ ∧ 𝑥 ∈ 𝐴) ∧ 𝑦 ∈ 𝐴) → (𝑥 ≤ 𝑦 ↔ (𝑥 ≠ 𝑦 → 𝑥 < 𝑦))) |
| 16 | 15 | biimprd 248 | . . . . 5 ⊢ (((𝐴 ⊆ ℝ ∧ 𝑥 ∈ 𝐴) ∧ 𝑦 ∈ 𝐴) → ((𝑥 ≠ 𝑦 → 𝑥 < 𝑦) → 𝑥 ≤ 𝑦)) |
| 17 | 16 | ralimdva 3145 | . . . 4 ⊢ ((𝐴 ⊆ ℝ ∧ 𝑥 ∈ 𝐴) → (∀𝑦 ∈ 𝐴 (𝑥 ≠ 𝑦 → 𝑥 < 𝑦) → ∀𝑦 ∈ 𝐴 𝑥 ≤ 𝑦)) |
| 18 | 17 | reximdva 3146 | . . 3 ⊢ (𝐴 ⊆ ℝ → (∃𝑥 ∈ 𝐴 ∀𝑦 ∈ 𝐴 (𝑥 ≠ 𝑦 → 𝑥 < 𝑦) → ∃𝑥 ∈ 𝐴 ∀𝑦 ∈ 𝐴 𝑥 ≤ 𝑦)) |
| 19 | 18 | 3ad2ant1 1133 | . 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 206 ∧ wa 395 ∨ wo 847 ∧ w3a 1086 ∈ wcel 2109 ≠ wne 2925 ∀wral 3044 ∃wrex 3053 ⊆ wss 3914 ∅c0 4296 class class class wbr 5107 Or wor 5545 Fincfn 8918 ℝcr 11067 < clt 11208 ≤ cle 11209 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1795 ax-4 1809 ax-5 1910 ax-6 1967 ax-7 2008 ax-8 2111 ax-9 2119 ax-10 2142 ax-11 2158 ax-12 2178 ax-ext 2701 ax-sep 5251 ax-nul 5261 ax-pow 5320 ax-pr 5387 ax-un 7711 ax-resscn 11125 ax-pre-lttri 11142 ax-pre-lttrn 11143 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1543 df-fal 1553 df-ex 1780 df-nf 1784 df-sb 2066 df-mo 2533 df-eu 2562 df-clab 2708 df-cleq 2721 df-clel 2803 df-nfc 2878 df-ne 2926 df-nel 3030 df-ral 3045 df-rex 3054 df-reu 3355 df-rab 3406 df-v 3449 df-sbc 3754 df-csb 3863 df-dif 3917 df-un 3919 df-in 3921 df-ss 3931 df-pss 3934 df-nul 4297 df-if 4489 df-pw 4565 df-sn 4590 df-pr 4592 df-op 4596 df-uni 4872 df-br 5108 df-opab 5170 df-mpt 5189 df-tr 5215 df-id 5533 df-eprel 5538 df-po 5546 df-so 5547 df-fr 5591 df-we 5593 df-xp 5644 df-rel 5645 df-cnv 5646 df-co 5647 df-dm 5648 df-rn 5649 df-res 5650 df-ima 5651 df-ord 6335 df-on 6336 df-lim 6337 df-suc 6338 df-iota 6464 df-fun 6513 df-fn 6514 df-f 6515 df-f1 6516 df-fo 6517 df-f1o 6518 df-fv 6519 df-om 7843 df-er 8671 df-en 8919 df-dom 8920 df-sdom 8921 df-fin 8922 df-pnf 11210 df-mnf 11211 df-xr 11212 df-ltxr 11213 df-le 11214 |
| This theorem is referenced by: fiminre2 12131 prmgaplem4 17025 aks4d1p5 42068 aks4d1p8 42075 hoidmvlelem2 46594 |
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