| 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 781 | . . 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 11295 | . . . . . . 7 ⊢ (𝜑 → (𝐴 < 𝐵 ↔ ¬ 𝐵 ≤ 𝐴)) |
| 5 | 4 | biimpar 483 | . . . . . 6 ⊢ ((𝜑 ∧ ¬ 𝐵 ≤ 𝐴) → 𝐴 < 𝐵) |
| 6 | 2 | adantr 486 | . . . . . . . . 9 ⊢ ((𝜑 ∧ 𝐴 < 𝐵) → 𝐴 ∈ ℝ*) |
| 7 | 3 | adantr 486 | . . . . . . . . 9 ⊢ ((𝜑 ∧ 𝐴 < 𝐵) → 𝐵 ∈ ℝ*) |
| 8 | simpr 490 | . . . . . . . . 9 ⊢ ((𝜑 ∧ 𝐴 < 𝐵) → 𝐴 < 𝐵) | |
| 9 | qbtwnxr 13244 | . . . . . . . . 9 ⊢ ((𝐴 ∈ ℝ* ∧ 𝐵 ∈ ℝ* ∧ 𝐴 < 𝐵) → ∃𝑞 ∈ ℚ (𝐴 < 𝑞 ∧ 𝑞 < 𝐵)) | |
| 10 | 6, 7, 8, 9 | syl3anc 1398 | . . . . . . . 8 ⊢ ((𝜑 ∧ 𝐴 < 𝐵) → ∃𝑞 ∈ ℚ (𝐴 < 𝑞 ∧ 𝑞 < 𝐵)) |
| 11 | 2 | ad2antrr 739 | . . . . . . . . . . . 12 ⊢ (((𝜑 ∧ 𝑞 ∈ ℚ) ∧ (𝐴 < 𝑞 ∧ 𝑞 < 𝐵)) → 𝐴 ∈ ℝ*) |
| 12 | 3 | ad2antrr 739 | . . . . . . . . . . . 12 ⊢ (((𝜑 ∧ 𝑞 ∈ ℚ) ∧ (𝐴 < 𝑞 ∧ 𝑞 < 𝐵)) → 𝐵 ∈ ℝ*) |
| 13 | qre 12995 | . . . . . . . . . . . . 13 ⊢ (𝑞 ∈ ℚ → 𝑞 ∈ ℝ) | |
| 14 | 13 | ad2antlr 740 | . . . . . . . . . . . 12 ⊢ (((𝜑 ∧ 𝑞 ∈ ℚ) ∧ (𝐴 < 𝑞 ∧ 𝑞 < 𝐵)) → 𝑞 ∈ ℝ) |
| 15 | simprl 783 | . . . . . . . . . . . 12 ⊢ (((𝜑 ∧ 𝑞 ∈ ℚ) ∧ (𝐴 < 𝑞 ∧ 𝑞 < 𝐵)) → 𝐴 < 𝑞) | |
| 16 | simprr 785 | . . . . . . . . . . . 12 ⊢ (((𝜑 ∧ 𝑞 ∈ ℚ) ∧ (𝐴 < 𝑞 ∧ 𝑞 < 𝐵)) → 𝑞 < 𝐵) | |
| 17 | 11, 12, 14, 15, 16 | eliood 46255 | . . . . . . . . . . 11 ⊢ (((𝜑 ∧ 𝑞 ∈ ℚ) ∧ (𝐴 < 𝑞 ∧ 𝑞 < 𝐵)) → 𝑞 ∈ (𝐴(,)𝐵)) |
| 18 | 17 | ex 418 | . . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝑞 ∈ ℚ) → ((𝐴 < 𝑞 ∧ 𝑞 < 𝐵) → 𝑞 ∈ (𝐴(,)𝐵))) |
| 19 | 18 | adantlr 728 | . . . . . . . . 9 ⊢ (((𝜑 ∧ 𝐴 < 𝐵) ∧ 𝑞 ∈ ℚ) → ((𝐴 < 𝑞 ∧ 𝑞 < 𝐵) → 𝑞 ∈ (𝐴(,)𝐵))) |
| 20 | 19 | reximdva 3181 | . . . . . . . 8 ⊢ ((𝜑 ∧ 𝐴 < 𝐵) → (∃𝑞 ∈ ℚ (𝐴 < 𝑞 ∧ 𝑞 < 𝐵) → ∃𝑞 ∈ ℚ 𝑞 ∈ (𝐴(,)𝐵))) |
| 21 | 10, 20 | mpd 16 | . . . . . . 7 ⊢ ((𝜑 ∧ 𝐴 < 𝐵) → ∃𝑞 ∈ ℚ 𝑞 ∈ (𝐴(,)𝐵)) |
| 22 | inn0 4330 | . . . . . . 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 603 | . . . . 5 ⊢ ((𝜑 ∧ ¬ 𝐵 ≤ 𝐴) → (ℚ ∩ (𝐴(,)𝐵)) ≠ ∅) |
| 25 | 24 | neneqd 2966 | . . . 4 ⊢ ((𝜑 ∧ ¬ 𝐵 ≤ 𝐴) → ¬ (ℚ ∩ (𝐴(,)𝐵)) = ∅) |
| 26 | 25 | adantlr 728 | . . 3 ⊢ (((𝜑 ∧ (ℚ ∩ (𝐴(,)𝐵)) = ∅) ∧ ¬ 𝐵 ≤ 𝐴) → ¬ (ℚ ∩ (𝐴(,)𝐵)) = ∅) |
| 27 | 1, 26 | condan 830 | . 2 ⊢ ((𝜑 ∧ (ℚ ∩ (𝐴(,)𝐵)) = ∅) → 𝐵 ≤ 𝐴) |
| 28 | ioo0 13415 | . . . . 5 ⊢ ((𝐴 ∈ ℝ* ∧ 𝐵 ∈ ℝ*) → ((𝐴(,)𝐵) = ∅ ↔ 𝐵 ≤ 𝐴)) | |
| 29 | 2, 3, 28 | syl2anc 596 | . . . 4 ⊢ (𝜑 → ((𝐴(,)𝐵) = ∅ ↔ 𝐵 ≤ 𝐴)) |
| 30 | 29 | biimpar 483 | . . 3 ⊢ ((𝜑 ∧ 𝐵 ≤ 𝐴) → (𝐴(,)𝐵) = ∅) |
| 31 | ineq2 4170 | . . . 4 ⊢ ((𝐴(,)𝐵) = ∅ → (ℚ ∩ (𝐴(,)𝐵)) = (ℚ ∩ ∅)) | |
| 32 | in0 4355 | . . . 4 ⊢ (ℚ ∩ ∅) = ∅ | |
| 33 | 31, 32 | eqtrdi 2817 | . . 3 ⊢ ((𝐴(,)𝐵) = ∅ → (ℚ ∩ (𝐴(,)𝐵)) = ∅) |
| 34 | 30, 33 | syl 18 | . 2 ⊢ ((𝜑 ∧ 𝐵 ≤ 𝐴) → (ℚ ∩ (𝐴(,)𝐵)) = ∅) |
| 35 | 27, 34 | impbida 813 | 1 ⊢ (𝜑 → ((ℚ ∩ (𝐴(,)𝐵)) = ∅ ↔ 𝐵 ≤ 𝐴)) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: ¬ wn 3 → wi 4 ↔ wb 209 ∧ wa 401 = wceq 1570 ∈ wcel 2146 ≠ wne 2961 ∃wrex 3092 ∩ cin 3907 ∅c0 4289 class class class wbr 5114 (class class class)co 7423 ℝcr 11117 ℝ*cxr 11260 < clt 11261 ≤ cle 11262 ℚcq 12990 (,)cioo 13390 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1943 ax-6 2000 ax-7 2041 ax-8 2148 ax-9 2156 ax-10 2179 ax-11 2195 ax-12 2216 ax-ext 2738 ax-sep 5262 ax-nul 5274 ax-pow 5341 ax-pr 5409 ax-un 7745 ax-cnex 11174 ax-resscn 11175 ax-1cn 11176 ax-icn 11177 ax-addcl 11178 ax-addrcl 11179 ax-mulcl 11180 ax-mulrcl 11181 ax-mulcom 11182 ax-addass 11183 ax-mulass 11184 ax-distr 11185 ax-i2m1 11186 ax-1ne0 11187 ax-1rid 11188 ax-rnegex 11189 ax-rrecex 11190 ax-cnre 11191 ax-pre-lttri 11192 ax-pre-lttrn 11193 ax-pre-ltadd 11194 ax-pre-mulgt0 11195 ax-pre-sup 11196 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3or 1104 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-nf 1817 df-sb 2100 df-mo 2570 df-eu 2600 df-clab 2745 df-cleq 2758 df-clel 2841 df-nfc 2915 df-ne 2962 df-nel 3068 df-ral 3083 df-rex 3093 df-rmo 3372 df-reu 3373 df-rab 3420 df-v 3460 df-sbc 3748 df-csb 3857 df-dif 3911 df-un 3913 df-in 3915 df-ss 3925 df-pss 3928 df-nul 4290 df-if 4493 df-pw 4569 df-sn 4595 df-pr 4597 df-op 4601 df-uni 4878 df-iun 4963 df-br 5115 df-opab 5179 df-mpt 5198 df-tr 5224 df-id 5561 df-eprel 5566 df-po 5574 df-so 5575 df-fr 5619 df-we 5621 df-xp 5672 df-rel 5673 df-cnv 5674 df-co 5675 df-dm 5676 df-rn 5677 df-res 5678 df-ima 5679 df-pred 6309 df-ord 6370 df-on 6371 df-lim 6372 df-suc 6373 df-iota 6499 df-fun 6545 df-fn 6546 df-f 6547 df-f1 6548 df-fo 6549 df-f1o 6550 df-fv 6551 df-riota 7380 df-ov 7426 df-oprab 7427 df-mpo 7428 df-om 7872 df-1st 7995 df-2nd 7996 df-frecs 8287 df-wrecs 8318 df-recs 8367 df-rdg 8406 df-er 8703 df-en 8953 df-dom 8954 df-sdom 8955 df-sup 9412 df-inf 9413 df-pnf 11263 df-mnf 11264 df-xr 11265 df-ltxr 11266 df-le 11267 df-sub 11461 df-neg 11462 df-div 11890 df-nn 12252 df-n0 12523 df-z 12610 df-uz 12881 df-q 12991 df-ioo 13394 |
| This theorem is used by: hoiqssbllem3 47379 |
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