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Mirrors > Home > MPE Home > Th. List > fiminre2 | Structured version Visualization version GIF version |
Description: A nonempty finite set of real numbers is bounded below. (Contributed by Glauco Siliprandi, 8-Apr-2021.) |
Ref | Expression |
---|---|
fiminre2 | ⊢ ((𝐴 ⊆ ℝ ∧ 𝐴 ∈ Fin) → ∃𝑥 ∈ ℝ ∀𝑦 ∈ 𝐴 𝑥 ≤ 𝑦) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 0red 10962 | . . . 4 ⊢ (𝐴 = ∅ → 0 ∈ ℝ) | |
2 | rzal 4444 | . . . 4 ⊢ (𝐴 = ∅ → ∀𝑦 ∈ 𝐴 0 ≤ 𝑦) | |
3 | breq1 5081 | . . . . . 6 ⊢ (𝑥 = 0 → (𝑥 ≤ 𝑦 ↔ 0 ≤ 𝑦)) | |
4 | 3 | ralbidv 3122 | . . . . 5 ⊢ (𝑥 = 0 → (∀𝑦 ∈ 𝐴 𝑥 ≤ 𝑦 ↔ ∀𝑦 ∈ 𝐴 0 ≤ 𝑦)) |
5 | 4 | rspcev 3560 | . . . 4 ⊢ ((0 ∈ ℝ ∧ ∀𝑦 ∈ 𝐴 0 ≤ 𝑦) → ∃𝑥 ∈ ℝ ∀𝑦 ∈ 𝐴 𝑥 ≤ 𝑦) |
6 | 1, 2, 5 | syl2anc 583 | . . 3 ⊢ (𝐴 = ∅ → ∃𝑥 ∈ ℝ ∀𝑦 ∈ 𝐴 𝑥 ≤ 𝑦) |
7 | 6 | adantl 481 | . 2 ⊢ (((𝐴 ⊆ ℝ ∧ 𝐴 ∈ Fin) ∧ 𝐴 = ∅) → ∃𝑥 ∈ ℝ ∀𝑦 ∈ 𝐴 𝑥 ≤ 𝑦) |
8 | neqne 2952 | . . . 4 ⊢ (¬ 𝐴 = ∅ → 𝐴 ≠ ∅) | |
9 | 8 | adantl 481 | . . 3 ⊢ (((𝐴 ⊆ ℝ ∧ 𝐴 ∈ Fin) ∧ ¬ 𝐴 = ∅) → 𝐴 ≠ ∅) |
10 | simpll 763 | . . . 4 ⊢ (((𝐴 ⊆ ℝ ∧ 𝐴 ∈ Fin) ∧ 𝐴 ≠ ∅) → 𝐴 ⊆ ℝ) | |
11 | simplr 765 | . . . . 5 ⊢ (((𝐴 ⊆ ℝ ∧ 𝐴 ∈ Fin) ∧ 𝐴 ≠ ∅) → 𝐴 ∈ Fin) | |
12 | simpr 484 | . . . . 5 ⊢ (((𝐴 ⊆ ℝ ∧ 𝐴 ∈ Fin) ∧ 𝐴 ≠ ∅) → 𝐴 ≠ ∅) | |
13 | fiminre 11905 | . . . . 5 ⊢ ((𝐴 ⊆ ℝ ∧ 𝐴 ∈ Fin ∧ 𝐴 ≠ ∅) → ∃𝑥 ∈ 𝐴 ∀𝑦 ∈ 𝐴 𝑥 ≤ 𝑦) | |
14 | 10, 11, 12, 13 | syl3anc 1369 | . . . 4 ⊢ (((𝐴 ⊆ ℝ ∧ 𝐴 ∈ Fin) ∧ 𝐴 ≠ ∅) → ∃𝑥 ∈ 𝐴 ∀𝑦 ∈ 𝐴 𝑥 ≤ 𝑦) |
15 | ssrexv 3992 | . . . 4 ⊢ (𝐴 ⊆ ℝ → (∃𝑥 ∈ 𝐴 ∀𝑦 ∈ 𝐴 𝑥 ≤ 𝑦 → ∃𝑥 ∈ ℝ ∀𝑦 ∈ 𝐴 𝑥 ≤ 𝑦)) | |
16 | 10, 14, 15 | sylc 65 | . . 3 ⊢ (((𝐴 ⊆ ℝ ∧ 𝐴 ∈ Fin) ∧ 𝐴 ≠ ∅) → ∃𝑥 ∈ ℝ ∀𝑦 ∈ 𝐴 𝑥 ≤ 𝑦) |
17 | 9, 16 | syldan 590 | . 2 ⊢ (((𝐴 ⊆ ℝ ∧ 𝐴 ∈ Fin) ∧ ¬ 𝐴 = ∅) → ∃𝑥 ∈ ℝ ∀𝑦 ∈ 𝐴 𝑥 ≤ 𝑦) |
18 | 7, 17 | pm2.61dan 809 | 1 ⊢ ((𝐴 ⊆ ℝ ∧ 𝐴 ∈ Fin) → ∃𝑥 ∈ ℝ ∀𝑦 ∈ 𝐴 𝑥 ≤ 𝑦) |
Colors of variables: wff setvar class |
Syntax hints: ¬ wn 3 → wi 4 ∧ wa 395 = wceq 1541 ∈ wcel 2109 ≠ wne 2944 ∀wral 3065 ∃wrex 3066 ⊆ wss 3891 ∅c0 4261 class class class wbr 5078 Fincfn 8707 ℝcr 10854 0cc0 10855 ≤ cle 10994 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1801 ax-4 1815 ax-5 1916 ax-6 1974 ax-7 2014 ax-8 2111 ax-9 2119 ax-10 2140 ax-11 2157 ax-12 2174 ax-ext 2710 ax-sep 5226 ax-nul 5233 ax-pow 5291 ax-pr 5355 ax-un 7579 ax-resscn 10912 ax-1cn 10913 ax-addrcl 10916 ax-rnegex 10926 ax-cnre 10928 ax-pre-lttri 10929 ax-pre-lttrn 10930 |
This theorem depends on definitions: df-bi 206 df-an 396 df-or 844 df-3or 1086 df-3an 1087 df-tru 1544 df-fal 1554 df-ex 1786 df-nf 1790 df-sb 2071 df-mo 2541 df-eu 2570 df-clab 2717 df-cleq 2731 df-clel 2817 df-nfc 2890 df-ne 2945 df-nel 3051 df-ral 3070 df-rex 3071 df-reu 3072 df-rab 3074 df-v 3432 df-sbc 3720 df-csb 3837 df-dif 3894 df-un 3896 df-in 3898 df-ss 3908 df-pss 3910 df-nul 4262 df-if 4465 df-pw 4540 df-sn 4567 df-pr 4569 df-tp 4571 df-op 4573 df-uni 4845 df-br 5079 df-opab 5141 df-mpt 5162 df-tr 5196 df-id 5488 df-eprel 5494 df-po 5502 df-so 5503 df-fr 5543 df-we 5545 df-xp 5594 df-rel 5595 df-cnv 5596 df-co 5597 df-dm 5598 df-rn 5599 df-res 5600 df-ima 5601 df-ord 6266 df-on 6267 df-lim 6268 df-suc 6269 df-iota 6388 df-fun 6432 df-fn 6433 df-f 6434 df-f1 6435 df-fo 6436 df-f1o 6437 df-fv 6438 df-om 7701 df-er 8472 df-en 8708 df-dom 8709 df-sdom 8710 df-fin 8711 df-pnf 10995 df-mnf 10996 df-xr 10997 df-ltxr 10998 df-le 10999 |
This theorem is referenced by: infrefilb 11944 infxrrefi 42875 |
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