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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 13618 | . . . . 5 ⊢ (,):(ℝ* × ℝ*)⟶𝒫 ℝ | |
| 2 | 1 | fdmi 6751 | . . . 4 ⊢ dom (,) = (ℝ* × ℝ*) |
| 3 | 2 | imaeq2i 6068 | . . 3 ⊢ ((,) “ dom (,)) = ((,) “ (ℝ* × ℝ*)) |
| 4 | imadmrn 6085 | . . 3 ⊢ ((,) “ dom (,)) = ran (,) | |
| 5 | 3, 4 | eqtr3i 2788 | . 2 ⊢ ((,) “ (ℝ* × ℝ*)) = ran (,) |
| 6 | ssid 3935 | . . 3 ⊢ ℝ* ⊆ ℝ* | |
| 7 | 6 | qtopbaslem 25132 | . 2 ⊢ ((,) “ (ℝ* × ℝ*)) ∈ TopBases |
| 8 | 5, 7 | eqeltrri 2861 | 1 ⊢ ran (,) ∈ TopBases |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: ∈ wcel 2147 𝒫 cpw 4560 × cxp 5656 dom cdm 5658 ran crn 5659 “ cima 5661 ℝcr 11238 ℝ*cxr 11381 (,)cioo 13516 TopBasesctb 23318 |
| 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 1945 ax-6 2002 ax-7 2043 ax-8 2149 ax-9 2157 ax-10 2180 ax-11 2197 ax-12 2216 ax-ext 2735 ax-sep 5255 ax-nul 5266 ax-pow 5334 ax-pr 5398 ax-un 7783 ax-cnex 11295 ax-resscn 11296 ax-pre-lttri 11313 ax-pre-lttrn 11314 |
| 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 2102 df-mo 2567 df-eu 2597 df-clab 2742 df-cleq 2755 df-clel 2839 df-nfc 2913 df-ne 2960 df-nel 3066 df-ral 3081 df-rex 3091 df-rab 3417 df-v 3456 df-sbc 3743 df-csb 3852 df-ss 3901 df-dif 4050 df-in 4094 df-un 4154 df-nul 4282 df-if 4486 df-pw 4562 df-sn 4589 df-pr 4591 df-op 4841 df-uni 4873 df-iun 4958 df-br 5109 df-opab 5174 df-mpt 5193 df-id 5553 df-po 5566 df-so 5567 df-xp 5664 df-rel 5665 df-cnv 5666 df-co 5667 df-dm 5668 df-rn 5669 df-res 5670 df-ima 5671 df-iota 6520 df-fun 6568 df-fn 6569 df-f 6570 df-f1 6571 df-fo 6572 df-f1o 6573 df-fv 6574 df-ov 7454 df-oprab 7455 df-mpo 7456 df-1st 8035 df-2nd 8036 df-er 8755 df-en 9012 df-dom 9013 df-sdom 9014 df-pnf 11384 df-mnf 11385 df-xr 11386 df-ltxr 11387 df-le 11388 df-ioo 13520 df-bases 23319 |
| This theorem is used by: retop 25135 uniretop 25136 iooretop 25139 qdensere 25143 tgioo 25170 xrtgioo 25181 bndth 25334 ovolicc2 25898 cncombf 26034 cnmbf 26035 elmbfmvol2 35010 iccllysconn 36223 rellysconn 36224 mblfinlem3 38845 mblfinlem4 38846 ismblfin 38847 cnambfre 38854 |
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