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Mathbox for Glauco Siliprandi |
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Mirrors > Home > MPE Home > Th. List > Mathboxes > qinioo | Structured version Visualization version GIF version |
Description: The rational numbers are dense in ℝ. (Contributed by Glauco Siliprandi, 24-Dec-2020.) |
Ref | Expression |
---|---|
qinioo.a | ⊢ (𝜑 → 𝐴 ∈ ℝ*) |
qinioo.b | ⊢ (𝜑 → 𝐵 ∈ ℝ*) |
Ref | Expression |
---|---|
qinioo | ⊢ (𝜑 → ((ℚ ∩ (𝐴(,)𝐵)) = ∅ ↔ 𝐵 ≤ 𝐴)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | simplr 768 | . . 3 ⊢ (((𝜑 ∧ (ℚ ∩ (𝐴(,)𝐵)) = ∅) ∧ ¬ 𝐵 ≤ 𝐴) → (ℚ ∩ (𝐴(,)𝐵)) = ∅) | |
2 | qinioo.a | . . . . . . . 8 ⊢ (𝜑 → 𝐴 ∈ ℝ*) | |
3 | qinioo.b | . . . . . . . 8 ⊢ (𝜑 → 𝐵 ∈ ℝ*) | |
4 | 2, 3 | xrltnled 41995 | . . . . . . 7 ⊢ (𝜑 → (𝐴 < 𝐵 ↔ ¬ 𝐵 ≤ 𝐴)) |
5 | 4 | biimpar 481 | . . . . . 6 ⊢ ((𝜑 ∧ ¬ 𝐵 ≤ 𝐴) → 𝐴 < 𝐵) |
6 | 2 | adantr 484 | . . . . . . . . 9 ⊢ ((𝜑 ∧ 𝐴 < 𝐵) → 𝐴 ∈ ℝ*) |
7 | 3 | adantr 484 | . . . . . . . . 9 ⊢ ((𝜑 ∧ 𝐴 < 𝐵) → 𝐵 ∈ ℝ*) |
8 | simpr 488 | . . . . . . . . 9 ⊢ ((𝜑 ∧ 𝐴 < 𝐵) → 𝐴 < 𝐵) | |
9 | qbtwnxr 12581 | . . . . . . . . 9 ⊢ ((𝐴 ∈ ℝ* ∧ 𝐵 ∈ ℝ* ∧ 𝐴 < 𝐵) → ∃𝑞 ∈ ℚ (𝐴 < 𝑞 ∧ 𝑞 < 𝐵)) | |
10 | 6, 7, 8, 9 | syl3anc 1368 | . . . . . . . 8 ⊢ ((𝜑 ∧ 𝐴 < 𝐵) → ∃𝑞 ∈ ℚ (𝐴 < 𝑞 ∧ 𝑞 < 𝐵)) |
11 | 2 | ad2antrr 725 | . . . . . . . . . . . 12 ⊢ (((𝜑 ∧ 𝑞 ∈ ℚ) ∧ (𝐴 < 𝑞 ∧ 𝑞 < 𝐵)) → 𝐴 ∈ ℝ*) |
12 | 3 | ad2antrr 725 | . . . . . . . . . . . 12 ⊢ (((𝜑 ∧ 𝑞 ∈ ℚ) ∧ (𝐴 < 𝑞 ∧ 𝑞 < 𝐵)) → 𝐵 ∈ ℝ*) |
13 | qre 12341 | . . . . . . . . . . . . 13 ⊢ (𝑞 ∈ ℚ → 𝑞 ∈ ℝ) | |
14 | 13 | ad2antlr 726 | . . . . . . . . . . . 12 ⊢ (((𝜑 ∧ 𝑞 ∈ ℚ) ∧ (𝐴 < 𝑞 ∧ 𝑞 < 𝐵)) → 𝑞 ∈ ℝ) |
15 | simprl 770 | . . . . . . . . . . . 12 ⊢ (((𝜑 ∧ 𝑞 ∈ ℚ) ∧ (𝐴 < 𝑞 ∧ 𝑞 < 𝐵)) → 𝐴 < 𝑞) | |
16 | simprr 772 | . . . . . . . . . . . 12 ⊢ (((𝜑 ∧ 𝑞 ∈ ℚ) ∧ (𝐴 < 𝑞 ∧ 𝑞 < 𝐵)) → 𝑞 < 𝐵) | |
17 | 11, 12, 14, 15, 16 | eliood 42135 | . . . . . . . . . . 11 ⊢ (((𝜑 ∧ 𝑞 ∈ ℚ) ∧ (𝐴 < 𝑞 ∧ 𝑞 < 𝐵)) → 𝑞 ∈ (𝐴(,)𝐵)) |
18 | 17 | ex 416 | . . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝑞 ∈ ℚ) → ((𝐴 < 𝑞 ∧ 𝑞 < 𝐵) → 𝑞 ∈ (𝐴(,)𝐵))) |
19 | 18 | adantlr 714 | . . . . . . . . 9 ⊢ (((𝜑 ∧ 𝐴 < 𝐵) ∧ 𝑞 ∈ ℚ) → ((𝐴 < 𝑞 ∧ 𝑞 < 𝐵) → 𝑞 ∈ (𝐴(,)𝐵))) |
20 | 19 | reximdva 3233 | . . . . . . . 8 ⊢ ((𝜑 ∧ 𝐴 < 𝐵) → (∃𝑞 ∈ ℚ (𝐴 < 𝑞 ∧ 𝑞 < 𝐵) → ∃𝑞 ∈ ℚ 𝑞 ∈ (𝐴(,)𝐵))) |
21 | 10, 20 | mpd 15 | . . . . . . 7 ⊢ ((𝜑 ∧ 𝐴 < 𝐵) → ∃𝑞 ∈ ℚ 𝑞 ∈ (𝐴(,)𝐵)) |
22 | inn0 41709 | . . . . . . 7 ⊢ ((ℚ ∩ (𝐴(,)𝐵)) ≠ ∅ ↔ ∃𝑞 ∈ ℚ 𝑞 ∈ (𝐴(,)𝐵)) | |
23 | 21, 22 | sylibr 237 | . . . . . 6 ⊢ ((𝜑 ∧ 𝐴 < 𝐵) → (ℚ ∩ (𝐴(,)𝐵)) ≠ ∅) |
24 | 5, 23 | syldan 594 | . . . . 5 ⊢ ((𝜑 ∧ ¬ 𝐵 ≤ 𝐴) → (ℚ ∩ (𝐴(,)𝐵)) ≠ ∅) |
25 | 24 | neneqd 2992 | . . . 4 ⊢ ((𝜑 ∧ ¬ 𝐵 ≤ 𝐴) → ¬ (ℚ ∩ (𝐴(,)𝐵)) = ∅) |
26 | 25 | adantlr 714 | . . 3 ⊢ (((𝜑 ∧ (ℚ ∩ (𝐴(,)𝐵)) = ∅) ∧ ¬ 𝐵 ≤ 𝐴) → ¬ (ℚ ∩ (𝐴(,)𝐵)) = ∅) |
27 | 1, 26 | condan 817 | . 2 ⊢ ((𝜑 ∧ (ℚ ∩ (𝐴(,)𝐵)) = ∅) → 𝐵 ≤ 𝐴) |
28 | ioo0 12751 | . . . . 5 ⊢ ((𝐴 ∈ ℝ* ∧ 𝐵 ∈ ℝ*) → ((𝐴(,)𝐵) = ∅ ↔ 𝐵 ≤ 𝐴)) | |
29 | 2, 3, 28 | syl2anc 587 | . . . 4 ⊢ (𝜑 → ((𝐴(,)𝐵) = ∅ ↔ 𝐵 ≤ 𝐴)) |
30 | 29 | biimpar 481 | . . 3 ⊢ ((𝜑 ∧ 𝐵 ≤ 𝐴) → (𝐴(,)𝐵) = ∅) |
31 | ineq2 4133 | . . . 4 ⊢ ((𝐴(,)𝐵) = ∅ → (ℚ ∩ (𝐴(,)𝐵)) = (ℚ ∩ ∅)) | |
32 | in0 4299 | . . . 4 ⊢ (ℚ ∩ ∅) = ∅ | |
33 | 31, 32 | eqtrdi 2849 | . . 3 ⊢ ((𝐴(,)𝐵) = ∅ → (ℚ ∩ (𝐴(,)𝐵)) = ∅) |
34 | 30, 33 | syl 17 | . 2 ⊢ ((𝜑 ∧ 𝐵 ≤ 𝐴) → (ℚ ∩ (𝐴(,)𝐵)) = ∅) |
35 | 27, 34 | impbida 800 | 1 ⊢ (𝜑 → ((ℚ ∩ (𝐴(,)𝐵)) = ∅ ↔ 𝐵 ≤ 𝐴)) |
Colors of variables: wff setvar class |
Syntax hints: ¬ wn 3 → wi 4 ↔ wb 209 ∧ wa 399 = wceq 1538 ∈ wcel 2111 ≠ wne 2987 ∃wrex 3107 ∩ cin 3880 ∅c0 4243 class class class wbr 5030 (class class class)co 7135 ℝcr 10525 ℝ*cxr 10663 < clt 10664 ≤ cle 10665 ℚcq 12336 (,)cioo 12726 |
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-pow 5231 ax-pr 5295 ax-un 7441 ax-cnex 10582 ax-resscn 10583 ax-1cn 10584 ax-icn 10585 ax-addcl 10586 ax-addrcl 10587 ax-mulcl 10588 ax-mulrcl 10589 ax-mulcom 10590 ax-addass 10591 ax-mulass 10592 ax-distr 10593 ax-i2m1 10594 ax-1ne0 10595 ax-1rid 10596 ax-rnegex 10597 ax-rrecex 10598 ax-cnre 10599 ax-pre-lttri 10600 ax-pre-lttrn 10601 ax-pre-ltadd 10602 ax-pre-mulgt0 10603 ax-pre-sup 10604 |
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-nel 3092 df-ral 3111 df-rex 3112 df-reu 3113 df-rmo 3114 df-rab 3115 df-v 3443 df-sbc 3721 df-csb 3829 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-iun 4883 df-br 5031 df-opab 5093 df-mpt 5111 df-tr 5137 df-id 5425 df-eprel 5430 df-po 5438 df-so 5439 df-fr 5478 df-we 5480 df-xp 5525 df-rel 5526 df-cnv 5527 df-co 5528 df-dm 5529 df-rn 5530 df-res 5531 df-ima 5532 df-pred 6116 df-ord 6162 df-on 6163 df-lim 6164 df-suc 6165 df-iota 6283 df-fun 6326 df-fn 6327 df-f 6328 df-f1 6329 df-fo 6330 df-f1o 6331 df-fv 6332 df-riota 7093 df-ov 7138 df-oprab 7139 df-mpo 7140 df-om 7561 df-1st 7671 df-2nd 7672 df-wrecs 7930 df-recs 7991 df-rdg 8029 df-er 8272 df-en 8493 df-dom 8494 df-sdom 8495 df-sup 8890 df-inf 8891 df-pnf 10666 df-mnf 10667 df-xr 10668 df-ltxr 10669 df-le 10670 df-sub 10861 df-neg 10862 df-div 11287 df-nn 11626 df-n0 11886 df-z 11970 df-uz 12232 df-q 12337 df-ioo 12730 |
This theorem is referenced by: hoiqssbllem3 43263 |
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