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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 5131 | . 2 ⊢ (𝐹‘𝐴) = (℩𝑦𝐴𝐹𝑦) | |
2 | funfveu 5434 | . . 3 ⊢ ((Fun 𝐹 ∧ 𝐴 ∈ dom 𝐹) → ∃!𝑦 𝐴𝐹𝑦) | |
3 | euiotaex 5104 | . . 3 ⊢ (∃!𝑦 𝐴𝐹𝑦 → (℩𝑦𝐴𝐹𝑦) ∈ V) | |
4 | 2, 3 | syl 14 | . 2 ⊢ ((Fun 𝐹 ∧ 𝐴 ∈ dom 𝐹) → (℩𝑦𝐴𝐹𝑦) ∈ V) |
5 | 1, 4 | eqeltrid 2226 | 1 ⊢ ((Fun 𝐹 ∧ 𝐴 ∈ dom 𝐹) → (𝐹‘𝐴) ∈ V) |
Colors of variables: wff set class |
Syntax hints: → wi 4 ∧ wa 103 ∈ wcel 1480 ∃!weu 1999 Vcvv 2686 class class class wbr 3929 dom cdm 4539 ℩cio 5086 Fun wfun 5117 ‘cfv 5123 |
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 698 ax-5 1423 ax-7 1424 ax-gen 1425 ax-ie1 1469 ax-ie2 1470 ax-8 1482 ax-10 1483 ax-11 1484 ax-i12 1485 ax-bndl 1486 ax-4 1487 ax-14 1492 ax-17 1506 ax-i9 1510 ax-ial 1514 ax-i5r 1515 ax-ext 2121 ax-sep 4046 ax-pow 4098 ax-pr 4131 |
This theorem depends on definitions: df-bi 116 df-3an 964 df-tru 1334 df-nf 1437 df-sb 1736 df-eu 2002 df-mo 2003 df-clab 2126 df-cleq 2132 df-clel 2135 df-nfc 2270 df-ral 2421 df-rex 2422 df-v 2688 df-sbc 2910 df-un 3075 df-in 3077 df-ss 3084 df-pw 3512 df-sn 3533 df-pr 3534 df-op 3536 df-uni 3737 df-br 3930 df-opab 3990 df-id 4215 df-cnv 4547 df-co 4548 df-dm 4549 df-iota 5088 df-fun 5125 df-fv 5131 |
This theorem is referenced by: fnbrfvb 5462 fvelrnb 5469 funimass4 5472 fvelimab 5477 fniinfv 5479 funfvdm 5484 dmfco 5489 fvco2 5490 eqfnfv 5518 fndmdif 5525 fndmin 5527 fvimacnvi 5534 fvimacnv 5535 funconstss 5538 fniniseg 5540 fniniseg2 5542 fnniniseg2 5543 rexsupp 5544 fvelrn 5551 rexrn 5557 ralrn 5558 dff3im 5565 fmptco 5586 fsn2 5594 fnressn 5606 resfunexg 5641 eufnfv 5648 funfvima3 5651 rexima 5656 ralima 5657 fniunfv 5663 elunirn 5667 dff13 5669 foeqcnvco 5691 f1eqcocnv 5692 isocnv2 5713 isoini 5719 f1oiso 5727 fnovex 5804 suppssof1 5999 offveqb 6001 1stexg 6065 2ndexg 6066 smoiso 6199 rdgtfr 6271 rdgruledefgg 6272 rdgivallem 6278 frectfr 6297 frecrdg 6305 en1 6693 fundmen 6700 fnfi 6825 ordiso2 6920 climshft2 11075 slotex 11986 strsetsid 11992 |
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