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Mirrors > Home > ILE Home > Th. List > foun | Unicode version |
Description: The union of two onto functions with disjoint domains is an onto function. (Contributed by Mario Carneiro, 22-Jun-2016.) |
Ref | Expression |
---|---|
foun |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | fofn 5317 | . . . 4 | |
2 | fofn 5317 | . . . 4 | |
3 | 1, 2 | anim12i 336 | . . 3 |
4 | fnun 5199 | . . 3 | |
5 | 3, 4 | sylan 281 | . 2 |
6 | rnun 4917 | . . 3 | |
7 | forn 5318 | . . . . 5 | |
8 | 7 | ad2antrr 479 | . . . 4 |
9 | forn 5318 | . . . . 5 | |
10 | 9 | ad2antlr 480 | . . . 4 |
11 | 8, 10 | uneq12d 3201 | . . 3 |
12 | 6, 11 | syl5eq 2162 | . 2 |
13 | df-fo 5099 | . 2 | |
14 | 5, 12, 13 | sylanbrc 413 | 1 |
Colors of variables: wff set class |
Syntax hints: wi 4 wa 103 wceq 1316 cun 3039 cin 3040 c0 3333 crn 4510 wfn 5088 wfo 5091 |
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 588 ax-in2 589 ax-io 683 ax-5 1408 ax-7 1409 ax-gen 1410 ax-ie1 1454 ax-ie2 1455 ax-8 1467 ax-10 1468 ax-11 1469 ax-i12 1470 ax-bndl 1471 ax-4 1472 ax-14 1477 ax-17 1491 ax-i9 1495 ax-ial 1499 ax-i5r 1500 ax-ext 2099 ax-sep 4016 ax-pow 4068 ax-pr 4101 |
This theorem depends on definitions: df-bi 116 df-3an 949 df-tru 1319 df-nf 1422 df-sb 1721 df-eu 1980 df-mo 1981 df-clab 2104 df-cleq 2110 df-clel 2113 df-nfc 2247 df-ral 2398 df-v 2662 df-dif 3043 df-un 3045 df-in 3047 df-ss 3054 df-nul 3334 df-pw 3482 df-sn 3503 df-pr 3504 df-op 3506 df-br 3900 df-opab 3960 df-id 4185 df-rel 4516 df-cnv 4517 df-co 4518 df-dm 4519 df-rn 4520 df-fun 5095 df-fn 5096 df-f 5097 df-fo 5099 |
This theorem is referenced by: (None) |
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