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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 12738 | . . 3 TopOn TopOn | |
2 | f1oi 5464 | . . . . 5 | |
3 | f1of 5426 | . . . . 5 | |
4 | 2, 3 | ax-mp 5 | . . . 4 |
5 | 4 | biantrur 301 | . . 3 |
6 | 1, 5 | bitr4di 197 | . 2 TopOn TopOn |
7 | cnvresid 5256 | . . . . . . 7 | |
8 | 7 | imaeq1i 4937 | . . . . . 6 |
9 | elssuni 3811 | . . . . . . . . 9 | |
10 | 9 | adantl 275 | . . . . . . . 8 TopOn TopOn |
11 | toponuni 12554 | . . . . . . . . 9 TopOn | |
12 | 11 | ad2antlr 481 | . . . . . . . 8 TopOn TopOn |
13 | 10, 12 | sseqtrrd 3176 | . . . . . . 7 TopOn TopOn |
14 | resiima 4956 | . . . . . . 7 | |
15 | 13, 14 | syl 14 | . . . . . 6 TopOn TopOn |
16 | 8, 15 | syl5eq 2209 | . . . . 5 TopOn TopOn |
17 | 16 | eleq1d 2233 | . . . 4 TopOn TopOn |
18 | 17 | ralbidva 2460 | . . 3 TopOn TopOn |
19 | dfss3 3127 | . . 3 | |
20 | 18, 19 | bitr4di 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 1342 wcel 2135 wral 2442 wss 3111 cuni 3783 cid 4260 ccnv 4597 cres 4600 cima 4601 wf 5178 wf1o 5181 cfv 5182 (class class class)co 5836 TopOnctopon 12549 ccn 12726 |
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 604 ax-in2 605 ax-io 699 ax-5 1434 ax-7 1435 ax-gen 1436 ax-ie1 1480 ax-ie2 1481 ax-8 1491 ax-10 1492 ax-11 1493 ax-i12 1494 ax-bndl 1496 ax-4 1497 ax-17 1513 ax-i9 1517 ax-ial 1521 ax-i5r 1522 ax-13 2137 ax-14 2138 ax-ext 2146 ax-sep 4094 ax-pow 4147 ax-pr 4181 ax-un 4405 ax-setind 4508 |
This theorem depends on definitions: df-bi 116 df-3an 969 df-tru 1345 df-fal 1348 df-nf 1448 df-sb 1750 df-eu 2016 df-mo 2017 df-clab 2151 df-cleq 2157 df-clel 2160 df-nfc 2295 df-ne 2335 df-ral 2447 df-rex 2448 df-rab 2451 df-v 2723 df-sbc 2947 df-csb 3041 df-dif 3113 df-un 3115 df-in 3117 df-ss 3124 df-pw 3555 df-sn 3576 df-pr 3577 df-op 3579 df-uni 3784 df-iun 3862 df-br 3977 df-opab 4038 df-mpt 4039 df-id 4265 df-xp 4604 df-rel 4605 df-cnv 4606 df-co 4607 df-dm 4608 df-rn 4609 df-res 4610 df-ima 4611 df-iota 5147 df-fun 5184 df-fn 5185 df-f 5186 df-f1 5187 df-fo 5188 df-f1o 5189 df-fv 5190 df-ov 5839 df-oprab 5840 df-mpo 5841 df-1st 6100 df-2nd 6101 df-map 6607 df-top 12537 df-topon 12550 df-cn 12729 |
This theorem is referenced by: idcn 12753 |
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