| 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 45359 | . . . . . . 7 ⊢ (𝜑 → (𝐴 < 𝐵 ↔ ¬ 𝐵 ≤ 𝐴)) |
| 5 | 4 | biimpar 477 | . . . . . 6 ⊢ ((𝜑 ∧ ¬ 𝐵 ≤ 𝐴) → 𝐴 < 𝐵) |
| 6 | 2 | adantr 480 | . . . . . . . . 9 ⊢ ((𝜑 ∧ 𝐴 < 𝐵) → 𝐴 ∈ ℝ*) |
| 7 | 3 | adantr 480 | . . . . . . . . 9 ⊢ ((𝜑 ∧ 𝐴 < 𝐵) → 𝐵 ∈ ℝ*) |
| 8 | simpr 484 | . . . . . . . . 9 ⊢ ((𝜑 ∧ 𝐴 < 𝐵) → 𝐴 < 𝐵) | |
| 9 | qbtwnxr 13160 | . . . . . . . . 9 ⊢ ((𝐴 ∈ ℝ* ∧ 𝐵 ∈ ℝ* ∧ 𝐴 < 𝐵) → ∃𝑞 ∈ ℚ (𝐴 < 𝑞 ∧ 𝑞 < 𝐵)) | |
| 10 | 6, 7, 8, 9 | syl3anc 1373 | . . . . . . . 8 ⊢ ((𝜑 ∧ 𝐴 < 𝐵) → ∃𝑞 ∈ ℚ (𝐴 < 𝑞 ∧ 𝑞 < 𝐵)) |
| 11 | 2 | ad2antrr 726 | . . . . . . . . . . . 12 ⊢ (((𝜑 ∧ 𝑞 ∈ ℚ) ∧ (𝐴 < 𝑞 ∧ 𝑞 < 𝐵)) → 𝐴 ∈ ℝ*) |
| 12 | 3 | ad2antrr 726 | . . . . . . . . . . . 12 ⊢ (((𝜑 ∧ 𝑞 ∈ ℚ) ∧ (𝐴 < 𝑞 ∧ 𝑞 < 𝐵)) → 𝐵 ∈ ℝ*) |
| 13 | qre 12912 | . . . . . . . . . . . . 13 ⊢ (𝑞 ∈ ℚ → 𝑞 ∈ ℝ) | |
| 14 | 13 | ad2antlr 727 | . . . . . . . . . . . 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 45496 | . . . . . . . . . . 11 ⊢ (((𝜑 ∧ 𝑞 ∈ ℚ) ∧ (𝐴 < 𝑞 ∧ 𝑞 < 𝐵)) → 𝑞 ∈ (𝐴(,)𝐵)) |
| 18 | 17 | ex 412 | . . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝑞 ∈ ℚ) → ((𝐴 < 𝑞 ∧ 𝑞 < 𝐵) → 𝑞 ∈ (𝐴(,)𝐵))) |
| 19 | 18 | adantlr 715 | . . . . . . . . 9 ⊢ (((𝜑 ∧ 𝐴 < 𝐵) ∧ 𝑞 ∈ ℚ) → ((𝐴 < 𝑞 ∧ 𝑞 < 𝐵) → 𝑞 ∈ (𝐴(,)𝐵))) |
| 20 | 19 | reximdva 3146 | . . . . . . . 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 4335 | . . . . . . 7 ⊢ ((ℚ ∩ (𝐴(,)𝐵)) ≠ ∅ ↔ ∃𝑞 ∈ ℚ 𝑞 ∈ (𝐴(,)𝐵)) | |
| 23 | 21, 22 | sylibr 234 | . . . . . 6 ⊢ ((𝜑 ∧ 𝐴 < 𝐵) → (ℚ ∩ (𝐴(,)𝐵)) ≠ ∅) |
| 24 | 5, 23 | syldan 591 | . . . . 5 ⊢ ((𝜑 ∧ ¬ 𝐵 ≤ 𝐴) → (ℚ ∩ (𝐴(,)𝐵)) ≠ ∅) |
| 25 | 24 | neneqd 2930 | . . . 4 ⊢ ((𝜑 ∧ ¬ 𝐵 ≤ 𝐴) → ¬ (ℚ ∩ (𝐴(,)𝐵)) = ∅) |
| 26 | 25 | adantlr 715 | . . 3 ⊢ (((𝜑 ∧ (ℚ ∩ (𝐴(,)𝐵)) = ∅) ∧ ¬ 𝐵 ≤ 𝐴) → ¬ (ℚ ∩ (𝐴(,)𝐵)) = ∅) |
| 27 | 1, 26 | condan 817 | . 2 ⊢ ((𝜑 ∧ (ℚ ∩ (𝐴(,)𝐵)) = ∅) → 𝐵 ≤ 𝐴) |
| 28 | ioo0 13331 | . . . . 5 ⊢ ((𝐴 ∈ ℝ* ∧ 𝐵 ∈ ℝ*) → ((𝐴(,)𝐵) = ∅ ↔ 𝐵 ≤ 𝐴)) | |
| 29 | 2, 3, 28 | syl2anc 584 | . . . 4 ⊢ (𝜑 → ((𝐴(,)𝐵) = ∅ ↔ 𝐵 ≤ 𝐴)) |
| 30 | 29 | biimpar 477 | . . 3 ⊢ ((𝜑 ∧ 𝐵 ≤ 𝐴) → (𝐴(,)𝐵) = ∅) |
| 31 | ineq2 4177 | . . . 4 ⊢ ((𝐴(,)𝐵) = ∅ → (ℚ ∩ (𝐴(,)𝐵)) = (ℚ ∩ ∅)) | |
| 32 | in0 4358 | . . . 4 ⊢ (ℚ ∩ ∅) = ∅ | |
| 33 | 31, 32 | eqtrdi 2780 | . . 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 206 ∧ wa 395 = wceq 1540 ∈ wcel 2109 ≠ wne 2925 ∃wrex 3053 ∩ cin 3913 ∅c0 4296 class class class wbr 5107 (class class class)co 7387 ℝcr 11067 ℝ*cxr 11207 < clt 11208 ≤ cle 11209 ℚcq 12907 (,)cioo 13306 |
| 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-cnex 11124 ax-resscn 11125 ax-1cn 11126 ax-icn 11127 ax-addcl 11128 ax-addrcl 11129 ax-mulcl 11130 ax-mulrcl 11131 ax-mulcom 11132 ax-addass 11133 ax-mulass 11134 ax-distr 11135 ax-i2m1 11136 ax-1ne0 11137 ax-1rid 11138 ax-rnegex 11139 ax-rrecex 11140 ax-cnre 11141 ax-pre-lttri 11142 ax-pre-lttrn 11143 ax-pre-ltadd 11144 ax-pre-mulgt0 11145 ax-pre-sup 11146 |
| 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-rmo 3354 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-iun 4957 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-pred 6274 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-riota 7344 df-ov 7390 df-oprab 7391 df-mpo 7392 df-om 7843 df-1st 7968 df-2nd 7969 df-frecs 8260 df-wrecs 8291 df-recs 8340 df-rdg 8378 df-er 8671 df-en 8919 df-dom 8920 df-sdom 8921 df-sup 9393 df-inf 9394 df-pnf 11210 df-mnf 11211 df-xr 11212 df-ltxr 11213 df-le 11214 df-sub 11407 df-neg 11408 df-div 11836 df-nn 12187 df-n0 12443 df-z 12530 df-uz 12794 df-q 12908 df-ioo 13310 |
| This theorem is referenced by: hoiqssbllem3 46622 |
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