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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 2736 | . . . . . 6 ⊢ (topGen‘((,) “ (ℚ × ℚ))) = (topGen‘((,) “ (ℚ × ℚ))) | |
| 4 | 3 | tgqioo 24744 | . . . . 5 ⊢ (topGen‘ran (,)) = (topGen‘((,) “ (ℚ × ℚ))) |
| 5 | 2, 4, 3 | 3eqtri 2763 | . . . 4 ⊢ 𝐽 = (topGen‘((,) “ (ℚ × ℚ))) |
| 6 | 5 | a1i 11 | . . 3 ⊢ (𝜑 → 𝐽 = (topGen‘((,) “ (ℚ × ℚ)))) |
| 7 | 1, 6 | eleqtrd 2838 | . 2 ⊢ (𝜑 → 𝐴 ∈ (topGen‘((,) “ (ℚ × ℚ)))) |
| 8 | iooex 13284 | . . . 4 ⊢ (,) ∈ V | |
| 9 | imaexg 7855 | . . . 4 ⊢ ((,) ∈ V → ((,) “ (ℚ × ℚ)) ∈ V) | |
| 10 | 8, 9 | ax-mp 5 | . . 3 ⊢ ((,) “ (ℚ × ℚ)) ∈ V |
| 11 | eltg3 22906 | . . 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 2113 Vcvv 3440 ⊆ wss 3901 ∪ cuni 4863 × cxp 5622 ran crn 5625 “ cima 5627 ‘cfv 6492 ℚcq 12861 (,)cioo 13261 topGenctg 17357 |
| 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 2115 ax-9 2123 ax-10 2146 ax-11 2162 ax-12 2184 ax-ext 2708 ax-sep 5241 ax-nul 5251 ax-pow 5310 ax-pr 5377 ax-un 7680 ax-cnex 11082 ax-resscn 11083 ax-1cn 11084 ax-icn 11085 ax-addcl 11086 ax-addrcl 11087 ax-mulcl 11088 ax-mulrcl 11089 ax-mulcom 11090 ax-addass 11091 ax-mulass 11092 ax-distr 11093 ax-i2m1 11094 ax-1ne0 11095 ax-1rid 11096 ax-rnegex 11097 ax-rrecex 11098 ax-cnre 11099 ax-pre-lttri 11100 ax-pre-lttrn 11101 ax-pre-ltadd 11102 ax-pre-mulgt0 11103 ax-pre-sup 11104 |
| 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 2539 df-eu 2569 df-clab 2715 df-cleq 2728 df-clel 2811 df-nfc 2885 df-ne 2933 df-nel 3037 df-ral 3052 df-rex 3061 df-rmo 3350 df-reu 3351 df-rab 3400 df-v 3442 df-sbc 3741 df-csb 3850 df-dif 3904 df-un 3906 df-in 3908 df-ss 3918 df-pss 3921 df-nul 4286 df-if 4480 df-pw 4556 df-sn 4581 df-pr 4583 df-op 4587 df-uni 4864 df-iun 4948 df-br 5099 df-opab 5161 df-mpt 5180 df-tr 5206 df-id 5519 df-eprel 5524 df-po 5532 df-so 5533 df-fr 5577 df-we 5579 df-xp 5630 df-rel 5631 df-cnv 5632 df-co 5633 df-dm 5634 df-rn 5635 df-res 5636 df-ima 5637 df-pred 6259 df-ord 6320 df-on 6321 df-lim 6322 df-suc 6323 df-iota 6448 df-fun 6494 df-fn 6495 df-f 6496 df-f1 6497 df-fo 6498 df-f1o 6499 df-fv 6500 df-riota 7315 df-ov 7361 df-oprab 7362 df-mpo 7363 df-om 7809 df-1st 7933 df-2nd 7934 df-frecs 8223 df-wrecs 8254 df-recs 8303 df-rdg 8341 df-er 8635 df-en 8884 df-dom 8885 df-sdom 8886 df-sup 9345 df-inf 9346 df-pnf 11168 df-mnf 11169 df-xr 11170 df-ltxr 11171 df-le 11172 df-sub 11366 df-neg 11367 df-div 11795 df-nn 12146 df-n0 12402 df-z 12489 df-uz 12752 df-q 12862 df-ioo 13265 df-topgen 17363 df-bases 22890 |
| This theorem is referenced by: smfpimbor1lem1 47038 |
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