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Mirrors > Home > MPE Home > Th. List > Mathboxes > istoprelowl | Structured version Visualization version GIF version |
Description: The set of all closed-below, open-above intervals of reals generate a topology on the reals. (Contributed by ML, 27-Jul-2020.) |
Ref | Expression |
---|---|
istoprelowl.1 | ⊢ 𝐼 = ([,) “ (ℝ × ℝ)) |
Ref | Expression |
---|---|
istoprelowl | ⊢ (topGen‘𝐼) ∈ (TopOn‘ℝ) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | istoprelowl.1 | . . 3 ⊢ 𝐼 = ([,) “ (ℝ × ℝ)) | |
2 | 1 | isbasisrelowl 34638 | . 2 ⊢ 𝐼 ∈ TopBases |
3 | tgtopon 21578 | . . 3 ⊢ (𝐼 ∈ TopBases → (topGen‘𝐼) ∈ (TopOn‘∪ 𝐼)) | |
4 | 1 | icoreunrn 34639 | . . . . 5 ⊢ ℝ = ∪ 𝐼 |
5 | 4 | eqcomi 2830 | . . . 4 ⊢ ∪ 𝐼 = ℝ |
6 | 5 | fveq2i 6672 | . . 3 ⊢ (TopOn‘∪ 𝐼) = (TopOn‘ℝ) |
7 | 3, 6 | eleqtrdi 2923 | . 2 ⊢ (𝐼 ∈ TopBases → (topGen‘𝐼) ∈ (TopOn‘ℝ)) |
8 | 2, 7 | ax-mp 5 | 1 ⊢ (topGen‘𝐼) ∈ (TopOn‘ℝ) |
Colors of variables: wff setvar class |
Syntax hints: = wceq 1533 ∈ wcel 2110 ∪ cuni 4837 × cxp 5552 “ cima 5557 ‘cfv 6354 ℝcr 10535 [,)cico 12739 topGenctg 16710 TopOnctopon 21517 TopBasesctb 21552 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1792 ax-4 1806 ax-5 1907 ax-6 1966 ax-7 2011 ax-8 2112 ax-9 2120 ax-10 2141 ax-11 2157 ax-12 2173 ax-ext 2793 ax-sep 5202 ax-nul 5209 ax-pow 5265 ax-pr 5329 ax-un 7460 ax-cnex 10592 ax-resscn 10593 ax-1cn 10594 ax-icn 10595 ax-addcl 10596 ax-addrcl 10597 ax-mulcl 10598 ax-mulrcl 10599 ax-mulcom 10600 ax-addass 10601 ax-mulass 10602 ax-distr 10603 ax-i2m1 10604 ax-1ne0 10605 ax-1rid 10606 ax-rnegex 10607 ax-rrecex 10608 ax-cnre 10609 ax-pre-lttri 10610 ax-pre-lttrn 10611 ax-pre-ltadd 10612 ax-pre-mulgt0 10613 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3or 1084 df-3an 1085 df-tru 1536 df-ex 1777 df-nf 1781 df-sb 2066 df-mo 2618 df-eu 2650 df-clab 2800 df-cleq 2814 df-clel 2893 df-nfc 2963 df-ne 3017 df-nel 3124 df-ral 3143 df-rex 3144 df-reu 3145 df-rab 3147 df-v 3496 df-sbc 3772 df-csb 3883 df-dif 3938 df-un 3940 df-in 3942 df-ss 3951 df-nul 4291 df-if 4467 df-pw 4540 df-sn 4567 df-pr 4569 df-op 4573 df-uni 4838 df-iun 4920 df-br 5066 df-opab 5128 df-mpt 5146 df-id 5459 df-po 5473 df-so 5474 df-xp 5560 df-rel 5561 df-cnv 5562 df-co 5563 df-dm 5564 df-rn 5565 df-res 5566 df-ima 5567 df-iota 6313 df-fun 6356 df-fn 6357 df-f 6358 df-f1 6359 df-fo 6360 df-f1o 6361 df-fv 6362 df-riota 7113 df-ov 7158 df-oprab 7159 df-mpo 7160 df-1st 7688 df-2nd 7689 df-er 8288 df-en 8509 df-dom 8510 df-sdom 8511 df-pnf 10676 df-mnf 10677 df-xr 10678 df-ltxr 10679 df-le 10680 df-sub 10871 df-neg 10872 df-ico 12743 df-topgen 16716 df-top 21501 df-topon 21518 df-bases 21553 |
This theorem is referenced by: (None) |
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