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Mirrors > Home > ILE Home > Th. List > 2ndexg | Unicode version |
Description: Existence of the first member of a set. (Contributed by Jim Kingdon, 26-Jan-2019.) |
Ref | Expression |
---|---|
2ndexg |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | elex 2732 | . 2 | |
2 | fo2nd 6118 | . . . 4 | |
3 | fofn 5406 | . . . 4 | |
4 | 2, 3 | ax-mp 5 | . . 3 |
5 | funfvex 5497 | . . . 4 | |
6 | 5 | funfni 5282 | . . 3 |
7 | 4, 6 | mpan 421 | . 2 |
8 | 1, 7 | syl 14 | 1 |
Colors of variables: wff set class |
Syntax hints: wi 4 wcel 2135 cvv 2721 wfn 5177 wfo 5180 cfv 5182 c2nd 6099 |
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-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 |
This theorem depends on definitions: df-bi 116 df-3an 969 df-tru 1345 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-ral 2447 df-rex 2448 df-v 2723 df-sbc 2947 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-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-iota 5147 df-fun 5184 df-fn 5185 df-f 5186 df-fo 5188 df-fv 5190 df-2nd 6101 |
This theorem is referenced by: elxp7 6130 xpopth 6136 eqop 6137 op1steq 6139 2nd1st 6140 2ndrn 6143 dfoprab3 6151 elopabi 6155 mpofvex 6163 dfmpo 6182 cnvf1olem 6183 cnvoprab 6193 f1od2 6194 xpmapenlem 6806 cc2lem 7198 cnref1o 9579 fsumcnv 11364 fprodcnv 11552 qredeu 12008 qdenval 12095 txbas 12799 txdis 12818 |
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