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Mirrors > Home > ILE Home > Th. List > funfvex | GIF version |
Description: The value of a function exists. A special case of Corollary 6.13 of [TakeutiZaring] p. 27. (Contributed by Jim Kingdon, 29-Dec-2018.) |
Ref | Expression |
---|---|
funfvex | ⊢ ((Fun 𝐹 ∧ 𝐴 ∈ dom 𝐹) → (𝐹‘𝐴) ∈ V) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-fv 5190 | . 2 ⊢ (𝐹‘𝐴) = (℩𝑦𝐴𝐹𝑦) | |
2 | funfveu 5493 | . . 3 ⊢ ((Fun 𝐹 ∧ 𝐴 ∈ dom 𝐹) → ∃!𝑦 𝐴𝐹𝑦) | |
3 | euiotaex 5163 | . . 3 ⊢ (∃!𝑦 𝐴𝐹𝑦 → (℩𝑦𝐴𝐹𝑦) ∈ V) | |
4 | 2, 3 | syl 14 | . 2 ⊢ ((Fun 𝐹 ∧ 𝐴 ∈ dom 𝐹) → (℩𝑦𝐴𝐹𝑦) ∈ V) |
5 | 1, 4 | eqeltrid 2251 | 1 ⊢ ((Fun 𝐹 ∧ 𝐴 ∈ dom 𝐹) → (𝐹‘𝐴) ∈ V) |
Colors of variables: wff set class |
Syntax hints: → wi 4 ∧ wa 103 ∃!weu 2013 ∈ wcel 2135 Vcvv 2721 class class class wbr 3976 dom cdm 4598 ℩cio 5145 Fun wfun 5176 ‘cfv 5182 |
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-14 2138 ax-ext 2146 ax-sep 4094 ax-pow 4147 ax-pr 4181 |
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-id 4265 df-cnv 4606 df-co 4607 df-dm 4608 df-iota 5147 df-fun 5184 df-fv 5190 |
This theorem is referenced by: fnbrfvb 5521 fvelrnb 5528 funimass4 5531 fvelimab 5536 fniinfv 5538 funfvdm 5543 dmfco 5548 fvco2 5549 eqfnfv 5577 fndmdif 5584 fndmin 5586 fvimacnvi 5593 fvimacnv 5594 funconstss 5597 fniniseg 5599 fniniseg2 5601 fnniniseg2 5602 rexsupp 5603 fvelrn 5610 rexrn 5616 ralrn 5617 dff3im 5624 fmptco 5645 fsn2 5653 fnressn 5665 resfunexg 5700 eufnfv 5709 funfvima3 5712 rexima 5717 ralima 5718 fniunfv 5724 elunirn 5728 dff13 5730 foeqcnvco 5752 f1eqcocnv 5753 isocnv2 5774 isoini 5780 f1oiso 5788 fnovex 5866 suppssof1 6061 offveqb 6063 1stexg 6127 2ndexg 6128 smoiso 6261 rdgtfr 6333 rdgruledefgg 6334 rdgivallem 6340 frectfr 6359 frecrdg 6367 en1 6756 fundmen 6763 fnfi 6893 ordiso2 6991 cc2lem 7198 climshft2 11233 slotex 12358 strsetsid 12364 |
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