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Mirrors > Home > ILE Home > Th. List > fo00 | Unicode version |
Description: Onto mapping of the empty set. (Contributed by NM, 22-Mar-2006.) |
Ref | Expression |
---|---|
fo00 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | fofn 5128 | . . . . . 6 | |
2 | fn0 5038 | . . . . . . 7 | |
3 | f10 5180 | . . . . . . . 8 | |
4 | f1eq1 5107 | . . . . . . . 8 | |
5 | 3, 4 | mpbiri 166 | . . . . . . 7 |
6 | 2, 5 | sylbi 119 | . . . . . 6 |
7 | 1, 6 | syl 14 | . . . . 5 |
8 | 7 | ancri 317 | . . . 4 |
9 | df-f1o 4929 | . . . 4 | |
10 | 8, 9 | sylibr 132 | . . 3 |
11 | f1ofo 5153 | . . 3 | |
12 | 10, 11 | impbii 124 | . 2 |
13 | f1o00 5181 | . 2 | |
14 | 12, 13 | bitri 182 | 1 |
Colors of variables: wff set class |
Syntax hints: wa 102 wb 103 wceq 1284 c0 3251 wfn 4917 wf1 4919 wfo 4920 wf1o 4921 |
This theorem was proved from axioms: ax-1 5 ax-2 6 ax-mp 7 ax-ia1 104 ax-ia2 105 ax-ia3 106 ax-in1 576 ax-in2 577 ax-io 662 ax-5 1376 ax-7 1377 ax-gen 1378 ax-ie1 1422 ax-ie2 1423 ax-8 1435 ax-10 1436 ax-11 1437 ax-i12 1438 ax-bndl 1439 ax-4 1440 ax-14 1445 ax-17 1459 ax-i9 1463 ax-ial 1467 ax-i5r 1468 ax-ext 2063 ax-sep 3896 ax-nul 3904 ax-pow 3948 ax-pr 3964 |
This theorem depends on definitions: df-bi 115 df-3an 921 df-tru 1287 df-fal 1290 df-nf 1390 df-sb 1686 df-eu 1944 df-mo 1945 df-clab 2068 df-cleq 2074 df-clel 2077 df-nfc 2208 df-ral 2353 df-rex 2354 df-v 2603 df-dif 2975 df-un 2977 df-in 2979 df-ss 2986 df-nul 3252 df-pw 3384 df-sn 3404 df-pr 3405 df-op 3407 df-br 3786 df-opab 3840 df-id 4048 df-xp 4369 df-rel 4370 df-cnv 4371 df-co 4372 df-dm 4373 df-rn 4374 df-fun 4924 df-fn 4925 df-f 4926 df-f1 4927 df-fo 4928 df-f1o 4929 |
This theorem is referenced by: (None) |
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