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Mirrors > Home > ILE Home > Th. List > ssidcn | Unicode version |
Description: The identity function is a continuous function from one topology to another topology on the same set iff the domain is finer than the codomain. (Contributed by Mario Carneiro, 21-Mar-2015.) (Revised by Mario Carneiro, 21-Aug-2015.) |
Ref | Expression |
---|---|
ssidcn | TopOn TopOn |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | iscn 12369 | . . 3 TopOn TopOn | |
2 | f1oi 5405 | . . . . 5 | |
3 | f1of 5367 | . . . . 5 | |
4 | 2, 3 | ax-mp 5 | . . . 4 |
5 | 4 | biantrur 301 | . . 3 |
6 | 1, 5 | syl6bbr 197 | . 2 TopOn TopOn |
7 | cnvresid 5197 | . . . . . . 7 | |
8 | 7 | imaeq1i 4878 | . . . . . 6 |
9 | elssuni 3764 | . . . . . . . . 9 | |
10 | 9 | adantl 275 | . . . . . . . 8 TopOn TopOn |
11 | toponuni 12185 | . . . . . . . . 9 TopOn | |
12 | 11 | ad2antlr 480 | . . . . . . . 8 TopOn TopOn |
13 | 10, 12 | sseqtrrd 3136 | . . . . . . 7 TopOn TopOn |
14 | resiima 4897 | . . . . . . 7 | |
15 | 13, 14 | syl 14 | . . . . . 6 TopOn TopOn |
16 | 8, 15 | syl5eq 2184 | . . . . 5 TopOn TopOn |
17 | 16 | eleq1d 2208 | . . . 4 TopOn TopOn |
18 | 17 | ralbidva 2433 | . . 3 TopOn TopOn |
19 | dfss3 3087 | . . 3 | |
20 | 18, 19 | syl6bbr 197 | . 2 TopOn TopOn |
21 | 6, 20 | bitrd 187 | 1 TopOn TopOn |
Colors of variables: wff set class |
Syntax hints: wi 4 wa 103 wb 104 wceq 1331 wcel 1480 wral 2416 wss 3071 cuni 3736 cid 4210 ccnv 4538 cres 4541 cima 4542 wf 5119 wf1o 5122 cfv 5123 (class class class)co 5774 TopOnctopon 12180 ccn 12357 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-in1 603 ax-in2 604 ax-io 698 ax-5 1423 ax-7 1424 ax-gen 1425 ax-ie1 1469 ax-ie2 1470 ax-8 1482 ax-10 1483 ax-11 1484 ax-i12 1485 ax-bndl 1486 ax-4 1487 ax-13 1491 ax-14 1492 ax-17 1506 ax-i9 1510 ax-ial 1514 ax-i5r 1515 ax-ext 2121 ax-sep 4046 ax-pow 4098 ax-pr 4131 ax-un 4355 ax-setind 4452 |
This theorem depends on definitions: df-bi 116 df-3an 964 df-tru 1334 df-fal 1337 df-nf 1437 df-sb 1736 df-eu 2002 df-mo 2003 df-clab 2126 df-cleq 2132 df-clel 2135 df-nfc 2270 df-ne 2309 df-ral 2421 df-rex 2422 df-rab 2425 df-v 2688 df-sbc 2910 df-csb 3004 df-dif 3073 df-un 3075 df-in 3077 df-ss 3084 df-pw 3512 df-sn 3533 df-pr 3534 df-op 3536 df-uni 3737 df-iun 3815 df-br 3930 df-opab 3990 df-mpt 3991 df-id 4215 df-xp 4545 df-rel 4546 df-cnv 4547 df-co 4548 df-dm 4549 df-rn 4550 df-res 4551 df-ima 4552 df-iota 5088 df-fun 5125 df-fn 5126 df-f 5127 df-f1 5128 df-fo 5129 df-f1o 5130 df-fv 5131 df-ov 5777 df-oprab 5778 df-mpo 5779 df-1st 6038 df-2nd 6039 df-map 6544 df-top 12168 df-topon 12181 df-cn 12360 |
This theorem is referenced by: idcn 12384 |
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