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| Mirrors > Home > ILE Home > Th. List > cnima | Unicode 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 |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | eqid 2207 |
. . . . 5
| |
| 2 | eqid 2207 |
. . . . 5
| |
| 3 | 1, 2 | iscn2 14787 |
. . . 4
|
| 4 | 3 | simprbi 275 |
. . 3
|
| 5 | 4 | simprd 114 |
. 2
|
| 6 | imaeq2 5037 |
. . . 4
| |
| 7 | 6 | eleq1d 2276 |
. . 3
|
| 8 | 7 | rspccva 2883 |
. 2
|
| 9 | 5, 8 | sylan 283 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-in1 615 ax-in2 616 ax-io 711 ax-5 1471 ax-7 1472 ax-gen 1473 ax-ie1 1517 ax-ie2 1518 ax-8 1528 ax-10 1529 ax-11 1530 ax-i12 1531 ax-bndl 1533 ax-4 1534 ax-17 1550 ax-i9 1554 ax-ial 1558 ax-i5r 1559 ax-13 2180 ax-14 2181 ax-ext 2189 ax-sep 4178 ax-pow 4234 ax-pr 4269 ax-un 4498 ax-setind 4603 |
| This theorem depends on definitions: df-bi 117 df-3an 983 df-tru 1376 df-fal 1379 df-nf 1485 df-sb 1787 df-eu 2058 df-mo 2059 df-clab 2194 df-cleq 2200 df-clel 2203 df-nfc 2339 df-ne 2379 df-ral 2491 df-rex 2492 df-rab 2495 df-v 2778 df-sbc 3006 df-csb 3102 df-dif 3176 df-un 3178 df-in 3180 df-ss 3187 df-pw 3628 df-sn 3649 df-pr 3650 df-op 3652 df-uni 3865 df-iun 3943 df-br 4060 df-opab 4122 df-mpt 4123 df-id 4358 df-xp 4699 df-rel 4700 df-cnv 4701 df-co 4702 df-dm 4703 df-rn 4704 df-res 4705 df-ima 4706 df-iota 5251 df-fun 5292 df-fn 5293 df-f 5294 df-fv 5298 df-ov 5970 df-oprab 5971 df-mpo 5972 df-1st 6249 df-2nd 6250 df-map 6760 df-top 14585 df-topon 14598 df-cn 14775 |
| This theorem is referenced by: cnco 14808 cnclima 14810 cnntri 14811 cnss1 14813 cnss2 14814 cncnpi 14815 cnrest 14822 txcnmpt 14860 txdis1cn 14865 imasnopn 14886 hmeoima 14897 hmeoopn 14898 hmeoimaf1o 14901 |
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