![]() |
Metamath Proof Explorer |
< Previous
Next >
Nearby theorems |
|
Mirrors > Home > MPE Home > Th. List > cnima | Structured version Visualization version GIF version |
Description: An open subset of the codomain of a continuous function has an open preimage. (Contributed by FL, 15-Dec-2006.) |
Ref | Expression |
---|---|
cnima | ⊢ ((𝐹 ∈ (𝐽 Cn 𝐾) ∧ 𝐴 ∈ 𝐾) → (◡𝐹 “ 𝐴) ∈ 𝐽) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | eqid 2798 | . . . . 5 ⊢ ∪ 𝐽 = ∪ 𝐽 | |
2 | eqid 2798 | . . . . 5 ⊢ ∪ 𝐾 = ∪ 𝐾 | |
3 | 1, 2 | iscn2 21843 | . . . 4 ⊢ (𝐹 ∈ (𝐽 Cn 𝐾) ↔ ((𝐽 ∈ Top ∧ 𝐾 ∈ Top) ∧ (𝐹:∪ 𝐽⟶∪ 𝐾 ∧ ∀𝑥 ∈ 𝐾 (◡𝐹 “ 𝑥) ∈ 𝐽))) |
4 | 3 | simprbi 500 | . . 3 ⊢ (𝐹 ∈ (𝐽 Cn 𝐾) → (𝐹:∪ 𝐽⟶∪ 𝐾 ∧ ∀𝑥 ∈ 𝐾 (◡𝐹 “ 𝑥) ∈ 𝐽)) |
5 | 4 | simprd 499 | . 2 ⊢ (𝐹 ∈ (𝐽 Cn 𝐾) → ∀𝑥 ∈ 𝐾 (◡𝐹 “ 𝑥) ∈ 𝐽) |
6 | imaeq2 5892 | . . . 4 ⊢ (𝑥 = 𝐴 → (◡𝐹 “ 𝑥) = (◡𝐹 “ 𝐴)) | |
7 | 6 | eleq1d 2874 | . . 3 ⊢ (𝑥 = 𝐴 → ((◡𝐹 “ 𝑥) ∈ 𝐽 ↔ (◡𝐹 “ 𝐴) ∈ 𝐽)) |
8 | 7 | rspccva 3570 | . 2 ⊢ ((∀𝑥 ∈ 𝐾 (◡𝐹 “ 𝑥) ∈ 𝐽 ∧ 𝐴 ∈ 𝐾) → (◡𝐹 “ 𝐴) ∈ 𝐽) |
9 | 5, 8 | sylan 583 | 1 ⊢ ((𝐹 ∈ (𝐽 Cn 𝐾) ∧ 𝐴 ∈ 𝐾) → (◡𝐹 “ 𝐴) ∈ 𝐽) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∧ wa 399 = wceq 1538 ∈ wcel 2111 ∀wral 3106 ∪ cuni 4800 ◡ccnv 5518 “ cima 5522 ⟶wf 6320 (class class class)co 7135 Topctop 21498 Cn ccn 21829 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1911 ax-6 1970 ax-7 2015 ax-8 2113 ax-9 2121 ax-10 2142 ax-11 2158 ax-12 2175 ax-ext 2770 ax-sep 5167 ax-nul 5174 ax-pow 5231 ax-pr 5295 ax-un 7441 |
This theorem depends on definitions: df-bi 210 df-an 400 df-or 845 df-3an 1086 df-tru 1541 df-ex 1782 df-nf 1786 df-sb 2070 df-mo 2598 df-eu 2629 df-clab 2777 df-cleq 2791 df-clel 2870 df-nfc 2938 df-ral 3111 df-rex 3112 df-rab 3115 df-v 3443 df-sbc 3721 df-dif 3884 df-un 3886 df-in 3888 df-ss 3898 df-nul 4244 df-if 4426 df-pw 4499 df-sn 4526 df-pr 4528 df-op 4532 df-uni 4801 df-br 5031 df-opab 5093 df-mpt 5111 df-id 5425 df-xp 5525 df-rel 5526 df-cnv 5527 df-co 5528 df-dm 5529 df-rn 5530 df-res 5531 df-ima 5532 df-iota 6283 df-fun 6326 df-fn 6327 df-f 6328 df-fv 6332 df-ov 7138 df-oprab 7139 df-mpo 7140 df-map 8391 df-top 21499 df-topon 21516 df-cn 21832 |
This theorem is referenced by: cnco 21871 cnclima 21873 cnntri 21876 cnss1 21881 cnss2 21882 cncnpi 21883 cnrest 21890 cnt0 21951 cnhaus 21959 cncmp 21997 cnconn 22027 2ndcomap 22063 kgencn3 22163 txcnmpt 22229 txdis1cn 22240 pthaus 22243 ptrescn 22244 txkgen 22257 xkoco2cn 22263 xkococnlem 22264 txconn 22294 imasnopn 22295 qtopkgen 22315 qtopss 22320 isr0 22342 kqreglem1 22346 kqreglem2 22347 kqnrmlem1 22348 kqnrmlem2 22349 hmeoima 22370 hmeoopn 22371 hmeoimaf1o 22375 reghmph 22398 nrmhmph 22399 tmdgsum2 22701 symgtgp 22711 ghmcnp 22720 tgpt0 22724 qustgpopn 22725 qustgplem 22726 nmhmcn 23725 mbfimaopnlem 24259 cncombf 24262 cnmbf 24263 dvloglem 25239 efopnlem2 25248 efopn 25249 atansopn 25518 cnmbfm 31631 cvmsss2 32634 cvmliftmolem2 32642 cvmliftlem15 32658 cvmlift2lem9a 32663 cvmlift2lem9 32671 cvmlift2lem10 32672 cvmlift3lem6 32684 cvmlift3lem8 32686 dvtanlem 35106 rfcnpre1 41648 rfcnpre2 41660 icccncfext 42529 |
Copyright terms: Public domain | W3C validator |