| 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 11358 | . . . . . . 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 13311 | . . . . . . . . 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 13061 | . . . . . . . . . . . . 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 46454 | . . . . . . . . . . 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 3176 | . . . . . . . 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 4320 | . . . . . . 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 2961 | . . . 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 13482 | . . . . 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 4160 | . . . 4 ⊢ ((𝐴(,)𝐵) = ∅ → (ℚ ∩ (𝐴(,)𝐵)) = (ℚ ∩ ∅)) | |
| 32 | in0 4345 | . . . 4 ⊢ (ℚ ∩ ∅) = ∅ | |
| 33 | 31, 32 | eqtrdi 2812 | . . 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 2145 ≠ wne 2956 ∃wrex 3087 ∩ cin 3898 ∅c0 4279 class class class wbr 5103 (class class class)co 7412 ℝcr 11180 ℝ*cxr 11323 < clt 11324 ≤ cle 11325 ℚcq 13056 (,)cioo 13457 |
| 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 2147 ax-9 2155 ax-10 2178 ax-11 2194 ax-12 2213 ax-ext 2733 ax-sep 5249 ax-nul 5260 ax-pow 5327 ax-pr 5391 ax-un 7740 ax-cnex 11237 ax-resscn 11238 ax-1cn 11239 ax-icn 11240 ax-addcl 11241 ax-addrcl 11242 ax-mulcl 11243 ax-mulrcl 11244 ax-mulcom 11245 ax-addass 11246 ax-mulass 11247 ax-distr 11248 ax-i2m1 11249 ax-1ne0 11250 ax-1rid 11251 ax-rnegex 11252 ax-rrecex 11253 ax-cnre 11254 ax-pre-lttri 11255 ax-pre-lttrn 11256 ax-pre-ltadd 11257 ax-pre-mulgt0 11258 ax-pre-sup 11259 |
| 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 2565 df-eu 2595 df-clab 2740 df-cleq 2753 df-clel 2836 df-nfc 2910 df-ne 2957 df-nel 3063 df-ral 3078 df-rex 3088 df-rmo 3366 df-reu 3367 df-rab 3414 df-v 3453 df-sbc 3740 df-csb 3848 df-dif 3902 df-un 3904 df-in 3906 df-ss 3916 df-pss 3919 df-nul 4280 df-if 4483 df-pw 4559 df-sn 4585 df-pr 4587 df-op 4591 df-uni 4868 df-iun 4953 df-br 5104 df-opab 5168 df-mpt 5187 df-tr 5213 df-id 5546 df-eprel 5551 df-po 5559 df-so 5560 df-fr 5604 df-we 5606 df-xp 5657 df-rel 5658 df-cnv 5659 df-co 5660 df-dm 5661 df-rn 5662 df-res 5663 df-ima 5664 df-pred 6297 df-ord 6358 df-on 6359 df-lim 6360 df-suc 6361 df-iota 6487 df-fun 6533 df-fn 6534 df-f 6535 df-f1 6536 df-fo 6537 df-f1o 6538 df-fv 6539 df-riota 7369 df-ov 7415 df-oprab 7416 df-mpo 7417 df-om 7867 df-1st 7990 df-2nd 7991 df-frecs 8283 df-wrecs 8314 df-recs 8363 df-rdg 8402 df-er 8701 df-en 8958 df-dom 8959 df-sdom 8960 df-sup 9418 df-inf 9419 df-pnf 11326 df-mnf 11327 df-xr 11328 df-ltxr 11329 df-le 11330 df-sub 11524 df-neg 11525 df-div 11955 df-nn 12317 df-n0 12588 df-z 12675 df-uz 12947 df-q 13057 df-ioo 13461 |
| This theorem is used by: hoiqssbllem3 47578 |
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