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| Mirrors > Home > MPE Home > Th. List > fex | Structured version Visualization version GIF version | ||
| Description: If the domain of a mapping is a set, the function is a set. (Contributed by NM, 3-Oct-1999.) |
| Ref | Expression |
|---|---|
| fex | ⊢ ((𝐹:𝐴⟶𝐵 ∧ 𝐴 ∈ 𝐶) → 𝐹 ∈ V) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | ffn 6670 | . 2 ⊢ (𝐹:𝐴⟶𝐵 → 𝐹 Fn 𝐴) | |
| 2 | fnex 7173 | . 2 ⊢ ((𝐹 Fn 𝐴 ∧ 𝐴 ∈ 𝐶) → 𝐹 ∈ V) | |
| 3 | 1, 2 | sylan 581 | 1 ⊢ ((𝐹:𝐴⟶𝐵 ∧ 𝐴 ∈ 𝐶) → 𝐹 ∈ V) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∧ wa 395 ∈ wcel 2114 Vcvv 3442 Fn wfn 6495 ⟶wf 6496 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1912 ax-6 1969 ax-7 2010 ax-8 2116 ax-9 2124 ax-10 2147 ax-11 2163 ax-12 2185 ax-ext 2709 ax-rep 5226 ax-sep 5243 ax-nul 5253 ax-pr 5379 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3an 1089 df-tru 1545 df-fal 1555 df-ex 1782 df-nf 1786 df-sb 2069 df-mo 2540 df-eu 2570 df-clab 2716 df-cleq 2729 df-clel 2812 df-nfc 2886 df-ne 2934 df-ral 3053 df-rex 3063 df-reu 3353 df-rab 3402 df-v 3444 df-sbc 3743 df-csb 3852 df-dif 3906 df-un 3908 df-in 3910 df-ss 3920 df-nul 4288 df-if 4482 df-sn 4583 df-pr 4585 df-op 4589 df-uni 4866 df-iun 4950 df-br 5101 df-opab 5163 df-mpt 5182 df-id 5527 df-xp 5638 df-rel 5639 df-cnv 5640 df-co 5641 df-dm 5642 df-rn 5643 df-res 5644 df-ima 5645 df-iota 6456 df-fun 6502 df-fn 6503 df-f 6504 df-f1 6505 df-fo 6506 df-f1o 6507 df-fv 6508 |
| This theorem is referenced by: fexd 7183 f1oexrnex 7879 fsuppeq 8127 suppsnop 8130 f1domg 8920 ffsuppbi 9313 mapfienlem2 9321 oiexg 9452 infxpenc2lem2 9942 isf32lem10 10284 hasheqf1oi 14286 hashf1rn 14287 hashimarn 14375 iswrd 14450 climsup 15605 fsum 15655 supcvg 15791 fprod 15876 vdwmc 16918 vdwpc 16920 isghmOLD 19157 elsymgbas 19315 gsumval3a 19844 gsumval3lem1 19846 gsumval3lem2 19847 dmdprd 19941 cnfldfun 21335 cnfldfunALT 21336 cnfldfunOLD 21348 cnfldfunALTOLD 21349 tngngp3 24612 climcncf 24861 ulmval 26357 pserulm 26399 elnoOLD 27626 isismt 28618 isgrpoi 30586 isvcOLD 30667 isnv 30700 cnnvg 30766 cnnvs 30768 cnnvnm 30769 cncph 30907 ajval 30949 hvmulex 31099 hhph 31266 hlimi 31276 chlimi 31322 hhssva 31345 hhsssm 31346 hhssnm 31347 hhshsslem1 31355 elunop 31960 adjeq 32023 leoprf2 32215 fpwrelmapffslem 32822 ccatws1f1o 33044 lmdvg 34131 esumpfinvallem 34252 omsf 34474 eulerpartgbij 34550 eulerpartlemmf 34553 subfacp1lem5 35400 sinccvglem 35888 poimirlem24 37895 mbfresfi 37917 elghomlem2OLD 38137 islaut 40459 ispautN 40475 istendo 41136 binomcxplemnotnn0 44712 climexp 45965 climinf 45966 stirlinglem8 46439 fourierdlem70 46534 ismea 46809 meadjiunlem 46823 grtriclwlk3 48305 isassintop 48570 fdivmpt 48900 elbigolo1 48917 fucofvalne 49684 |
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