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| Mirrors > Home > MPE Home > Th. List > retopbas | Structured version Visualization version GIF version | ||
| Description: A basis for the standard topology on the reals. (Contributed by NM, 6-Feb-2007.) (Proof shortened by Mario Carneiro, 17-Jun-2014.) |
| Ref | Expression |
|---|---|
| retopbas | ⊢ ran (,) ∈ TopBases |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | ioof 13500 | . . . . 5 ⊢ (,):(ℝ* × ℝ*)⟶𝒫 ℝ | |
| 2 | 1 | fdmi 6714 | . . . 4 ⊢ dom (,) = (ℝ* × ℝ*) |
| 3 | 2 | imaeq2i 6054 | . . 3 ⊢ ((,) “ dom (,)) = ((,) “ (ℝ* × ℝ*)) |
| 4 | imadmrn 6066 | . . 3 ⊢ ((,) “ dom (,)) = ran (,) | |
| 5 | 3, 4 | eqtr3i 2785 | . 2 ⊢ ((,) “ (ℝ* × ℝ*)) = ran (,) |
| 6 | ssid 3953 | . . 3 ⊢ ℝ* ⊆ ℝ* | |
| 7 | 6 | qtopbaslem 24984 | . 2 ⊢ ((,) “ (ℝ* × ℝ*)) ∈ TopBases |
| 8 | 5, 7 | eqeltrri 2857 | 1 ⊢ ran (,) ∈ TopBases |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: ∈ wcel 2145 𝒫 cpw 4557 × cxp 5653 dom cdm 5655 ran crn 5656 “ cima 5658 ℝcr 11123 ℝ*cxr 11266 (,)cioo 13398 TopBasesctb 23170 |
| 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 2732 ax-sep 5251 ax-nul 5263 ax-pow 5330 ax-pr 5398 ax-un 7736 ax-cnex 11180 ax-resscn 11181 ax-pre-lttri 11198 ax-pre-lttrn 11199 |
| 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 2564 df-eu 2594 df-clab 2739 df-cleq 2752 df-clel 2835 df-nfc 2909 df-ne 2956 df-nel 3062 df-ral 3077 df-rex 3087 df-rab 3413 df-v 3452 df-sbc 3740 df-csb 3848 df-dif 3902 df-un 3904 df-in 3906 df-ss 3916 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-id 5550 df-po 5563 df-so 5564 df-xp 5661 df-rel 5662 df-cnv 5663 df-co 5664 df-dm 5665 df-rn 5666 df-res 5667 df-ima 5668 df-iota 6489 df-fun 6535 df-fn 6536 df-f 6537 df-f1 6538 df-fo 6539 df-f1o 6540 df-fv 6541 df-ov 7416 df-oprab 7417 df-mpo 7418 df-1st 7986 df-2nd 7987 df-er 8696 df-en 8953 df-dom 8954 df-sdom 8955 df-pnf 11269 df-mnf 11270 df-xr 11271 df-ltxr 11272 df-le 11273 df-ioo 13402 df-bases 23171 |
| This theorem is used by: retop 24987 uniretop 24988 iooretop 24991 qdensere 24995 tgioo 25022 xrtgioo 25033 bndth 25186 ovolicc2 25750 cncombf 25886 cnmbf 25887 elmbfmvol2 34778 iccllysconn 35829 rellysconn 35830 mblfinlem3 38408 mblfinlem4 38409 ismblfin 38410 cnambfre 38417 |
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