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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 2761 | . . . . . 6 ⊢ (topGen‘((,) “ (ℚ × ℚ))) = (topGen‘((,) “ (ℚ × ℚ))) | |
| 4 | 3 | tgqioo 24840 | . . . . 5 ⊢ (topGen‘ran (,)) = (topGen‘((,) “ (ℚ × ℚ))) |
| 5 | 2, 4, 3 | 3eqtri 2788 | . . . 4 ⊢ 𝐽 = (topGen‘((,) “ (ℚ × ℚ))) |
| 6 | 5 | a1i 11 | . . 3 ⊢ (𝜑 → 𝐽 = (topGen‘((,) “ (ℚ × ℚ)))) |
| 7 | 1, 6 | eleqtrd 2863 | . 2 ⊢ (𝜑 → 𝐴 ∈ (topGen‘((,) “ (ℚ × ℚ)))) |
| 8 | iooex 13369 | . . . 4 ⊢ (,) ∈ V | |
| 9 | imaexg 7890 | . . . 4 ⊢ ((,) ∈ V → ((,) “ (ℚ × ℚ)) ∈ V) | |
| 10 | 8, 9 | ax-mp 5 | . . 3 ⊢ ((,) “ (ℚ × ℚ)) ∈ V |
| 11 | eltg3 23002 | . . 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 220 | 1 ⊢ (𝜑 → ∃𝑞(𝑞 ⊆ ((,) “ (ℚ × ℚ)) ∧ 𝐴 = ∪ 𝑞)) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ↔ wb 208 ∧ wa 399 = wceq 1559 ∃wex 1798 ∈ wcel 2141 Vcvv 3453 ⊆ wss 3904 ∪ cuni 4864 × cxp 5643 ran crn 5646 “ cima 5648 ‘cfv 6517 ℚcq 12946 (,)cioo 13346 topGenctg 17449 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1814 ax-4 1828 ax-5 1929 ax-6 1986 ax-7 2027 ax-8 2143 ax-9 2151 ax-10 2174 ax-11 2190 ax-12 2211 ax-ext 2733 ax-sep 5245 ax-nul 5255 ax-pow 5321 ax-pr 5389 ax-un 7714 ax-cnex 11126 ax-resscn 11127 ax-1cn 11128 ax-icn 11129 ax-addcl 11130 ax-addrcl 11131 ax-mulcl 11132 ax-mulrcl 11133 ax-mulcom 11134 ax-addass 11135 ax-mulass 11136 ax-distr 11137 ax-i2m1 11138 ax-1ne0 11139 ax-1rid 11140 ax-rnegex 11141 ax-rrecex 11142 ax-cnre 11143 ax-pre-lttri 11144 ax-pre-lttrn 11145 ax-pre-ltadd 11146 ax-pre-mulgt0 11147 ax-pre-sup 11148 |
| This theorem depends on definitions: df-bi 209 df-an 400 df-or 859 df-3or 1098 df-3an 1099 df-tru 1562 df-fal 1572 df-ex 1799 df-nf 1803 df-sb 2090 df-mo 2565 df-eu 2595 df-clab 2740 df-cleq 2753 df-clel 2836 df-nfc 2910 df-ne 2957 df-nel 3061 df-ral 3076 df-rex 3086 df-rmo 3366 df-reu 3367 df-rab 3414 df-v 3455 df-sbc 3745 df-csb 3853 df-dif 3907 df-un 3909 df-in 3911 df-ss 3921 df-pss 3924 df-nul 4286 df-if 4480 df-pw 4556 df-sn 4582 df-pr 4584 df-op 4588 df-uni 4865 df-iun 4950 df-br 5100 df-opab 5162 df-mpt 5181 df-tr 5207 df-id 5540 df-eprel 5545 df-po 5553 df-so 5554 df-fr 5598 df-we 5600 df-xp 5651 df-rel 5652 df-cnv 5653 df-co 5654 df-dm 5655 df-rn 5656 df-res 5657 df-ima 5658 df-pred 6284 df-ord 6345 df-on 6346 df-lim 6347 df-suc 6348 df-iota 6473 df-fun 6519 df-fn 6520 df-f 6521 df-f1 6522 df-fo 6523 df-f1o 6524 df-fv 6525 df-riota 7349 df-ov 7395 df-oprab 7396 df-mpo 7397 df-om 7843 df-1st 7966 df-2nd 7967 df-frecs 8257 df-wrecs 8288 df-recs 8337 df-rdg 8376 df-er 8673 df-en 8924 df-dom 8925 df-sdom 8926 df-sup 9385 df-inf 9386 df-pnf 11215 df-mnf 11216 df-xr 11217 df-ltxr 11218 df-le 11219 df-sub 11413 df-neg 11414 df-div 11842 df-nn 12208 df-n0 12479 df-z 12566 df-uz 12837 df-q 12947 df-ioo 13350 df-topgen 17455 df-bases 22986 |
| This theorem is referenced by: smfpimbor1lem1 47336 |
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