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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 2229 |
. . . . 5
| |
| 2 | eqid 2229 |
. . . . 5
| |
| 3 | 1, 2 | iscn2 14874 |
. . . 4
|
| 4 | 3 | simprbi 275 |
. . 3
|
| 5 | 4 | simprd 114 |
. 2
|
| 6 | imaeq2 5064 |
. . . 4
| |
| 7 | 6 | eleq1d 2298 |
. . 3
|
| 8 | 7 | rspccva 2906 |
. 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 617 ax-in2 618 ax-io 714 ax-5 1493 ax-7 1494 ax-gen 1495 ax-ie1 1539 ax-ie2 1540 ax-8 1550 ax-10 1551 ax-11 1552 ax-i12 1553 ax-bndl 1555 ax-4 1556 ax-17 1572 ax-i9 1576 ax-ial 1580 ax-i5r 1581 ax-13 2202 ax-14 2203 ax-ext 2211 ax-sep 4202 ax-pow 4258 ax-pr 4293 ax-un 4524 ax-setind 4629 |
| This theorem depends on definitions: df-bi 117 df-3an 1004 df-tru 1398 df-fal 1401 df-nf 1507 df-sb 1809 df-eu 2080 df-mo 2081 df-clab 2216 df-cleq 2222 df-clel 2225 df-nfc 2361 df-ne 2401 df-ral 2513 df-rex 2514 df-rab 2517 df-v 2801 df-sbc 3029 df-csb 3125 df-dif 3199 df-un 3201 df-in 3203 df-ss 3210 df-pw 3651 df-sn 3672 df-pr 3673 df-op 3675 df-uni 3889 df-iun 3967 df-br 4084 df-opab 4146 df-mpt 4147 df-id 4384 df-xp 4725 df-rel 4726 df-cnv 4727 df-co 4728 df-dm 4729 df-rn 4730 df-res 4731 df-ima 4732 df-iota 5278 df-fun 5320 df-fn 5321 df-f 5322 df-fv 5326 df-ov 6004 df-oprab 6005 df-mpo 6006 df-1st 6286 df-2nd 6287 df-map 6797 df-top 14672 df-topon 14685 df-cn 14862 |
| This theorem is referenced by: cnco 14895 cnclima 14897 cnntri 14898 cnss1 14900 cnss2 14901 cncnpi 14902 cnrest 14909 txcnmpt 14947 txdis1cn 14952 imasnopn 14973 hmeoima 14984 hmeoopn 14985 hmeoimaf1o 14988 |
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