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| Mirrors > Home > MPE Home > Th. List > Mathboxes > tgqioo2 | Structured version Visualization version GIF version | ||
| Description: Every open set of reals is the (countable) union of open interval with rational bounds. (Contributed by Glauco Siliprandi, 26-Jun-2021.) |
| Ref | Expression |
|---|---|
| tgqioo2.1 | ⊢ 𝐽 = (topGen‘ran (,)) |
| tgqioo2.2 | ⊢ (𝜑 → 𝐴 ∈ 𝐽) |
| Ref | Expression |
|---|---|
| tgqioo2 | ⊢ (𝜑 → ∃𝑞(𝑞 ⊆ ((,) “ (ℚ × ℚ)) ∧ 𝐴 = ∪ 𝑞)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | tgqioo2.2 | . . 3 ⊢ (𝜑 → 𝐴 ∈ 𝐽) | |
| 2 | tgqioo2.1 | . . . . 5 ⊢ 𝐽 = (topGen‘ran (,)) | |
| 3 | eqid 2731 | . . . . . 6 ⊢ (topGen‘((,) “ (ℚ × ℚ))) = (topGen‘((,) “ (ℚ × ℚ))) | |
| 4 | 3 | tgqioo 24713 | . . . . 5 ⊢ (topGen‘ran (,)) = (topGen‘((,) “ (ℚ × ℚ))) |
| 5 | 2, 4, 3 | 3eqtri 2758 | . . . 4 ⊢ 𝐽 = (topGen‘((,) “ (ℚ × ℚ))) |
| 6 | 5 | a1i 11 | . . 3 ⊢ (𝜑 → 𝐽 = (topGen‘((,) “ (ℚ × ℚ)))) |
| 7 | 1, 6 | eleqtrd 2833 | . 2 ⊢ (𝜑 → 𝐴 ∈ (topGen‘((,) “ (ℚ × ℚ)))) |
| 8 | iooex 13265 | . . . 4 ⊢ (,) ∈ V | |
| 9 | imaexg 7843 | . . . 4 ⊢ ((,) ∈ V → ((,) “ (ℚ × ℚ)) ∈ V) | |
| 10 | 8, 9 | ax-mp 5 | . . 3 ⊢ ((,) “ (ℚ × ℚ)) ∈ V |
| 11 | eltg3 22875 | . . 3 ⊢ (((,) “ (ℚ × ℚ)) ∈ V → (𝐴 ∈ (topGen‘((,) “ (ℚ × ℚ))) ↔ ∃𝑞(𝑞 ⊆ ((,) “ (ℚ × ℚ)) ∧ 𝐴 = ∪ 𝑞))) | |
| 12 | 10, 11 | ax-mp 5 | . 2 ⊢ (𝐴 ∈ (topGen‘((,) “ (ℚ × ℚ))) ↔ ∃𝑞(𝑞 ⊆ ((,) “ (ℚ × ℚ)) ∧ 𝐴 = ∪ 𝑞)) |
| 13 | 7, 12 | sylib 218 | 1 ⊢ (𝜑 → ∃𝑞(𝑞 ⊆ ((,) “ (ℚ × ℚ)) ∧ 𝐴 = ∪ 𝑞)) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ↔ wb 206 ∧ wa 395 = wceq 1541 ∃wex 1780 ∈ wcel 2111 Vcvv 3436 ⊆ wss 3902 ∪ cuni 4859 × cxp 5614 ran crn 5617 “ cima 5619 ‘cfv 6481 ℚcq 12843 (,)cioo 13242 topGenctg 17338 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1968 ax-7 2009 ax-8 2113 ax-9 2121 ax-10 2144 ax-11 2160 ax-12 2180 ax-ext 2703 ax-sep 5234 ax-nul 5244 ax-pow 5303 ax-pr 5370 ax-un 7668 ax-cnex 11059 ax-resscn 11060 ax-1cn 11061 ax-icn 11062 ax-addcl 11063 ax-addrcl 11064 ax-mulcl 11065 ax-mulrcl 11066 ax-mulcom 11067 ax-addass 11068 ax-mulass 11069 ax-distr 11070 ax-i2m1 11071 ax-1ne0 11072 ax-1rid 11073 ax-rnegex 11074 ax-rrecex 11075 ax-cnre 11076 ax-pre-lttri 11077 ax-pre-lttrn 11078 ax-pre-ltadd 11079 ax-pre-mulgt0 11080 ax-pre-sup 11081 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1544 df-fal 1554 df-ex 1781 df-nf 1785 df-sb 2068 df-mo 2535 df-eu 2564 df-clab 2710 df-cleq 2723 df-clel 2806 df-nfc 2881 df-ne 2929 df-nel 3033 df-ral 3048 df-rex 3057 df-rmo 3346 df-reu 3347 df-rab 3396 df-v 3438 df-sbc 3742 df-csb 3851 df-dif 3905 df-un 3907 df-in 3909 df-ss 3919 df-pss 3922 df-nul 4284 df-if 4476 df-pw 4552 df-sn 4577 df-pr 4579 df-op 4583 df-uni 4860 df-iun 4943 df-br 5092 df-opab 5154 df-mpt 5173 df-tr 5199 df-id 5511 df-eprel 5516 df-po 5524 df-so 5525 df-fr 5569 df-we 5571 df-xp 5622 df-rel 5623 df-cnv 5624 df-co 5625 df-dm 5626 df-rn 5627 df-res 5628 df-ima 5629 df-pred 6248 df-ord 6309 df-on 6310 df-lim 6311 df-suc 6312 df-iota 6437 df-fun 6483 df-fn 6484 df-f 6485 df-f1 6486 df-fo 6487 df-f1o 6488 df-fv 6489 df-riota 7303 df-ov 7349 df-oprab 7350 df-mpo 7351 df-om 7797 df-1st 7921 df-2nd 7922 df-frecs 8211 df-wrecs 8242 df-recs 8291 df-rdg 8329 df-er 8622 df-en 8870 df-dom 8871 df-sdom 8872 df-sup 9326 df-inf 9327 df-pnf 11145 df-mnf 11146 df-xr 11147 df-ltxr 11148 df-le 11149 df-sub 11343 df-neg 11344 df-div 11772 df-nn 12123 df-n0 12379 df-z 12466 df-uz 12730 df-q 12844 df-ioo 13246 df-topgen 17344 df-bases 22859 |
| This theorem is referenced by: smfpimbor1lem1 46835 |
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