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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 6668 | . 2 ⊢ (𝐹:𝐴⟶𝐵 → 𝐹 Fn 𝐴) | |
| 2 | fnex 7172 | . 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 3429 Fn wfn 6493 ⟶wf 6494 |
| 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 2708 ax-rep 5212 ax-sep 5231 ax-nul 5241 ax-pr 5375 |
| 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 2539 df-eu 2569 df-clab 2715 df-cleq 2728 df-clel 2811 df-nfc 2885 df-ne 2933 df-ral 3052 df-rex 3062 df-reu 3343 df-rab 3390 df-v 3431 df-sbc 3729 df-csb 3838 df-dif 3892 df-un 3894 df-in 3896 df-ss 3906 df-nul 4274 df-if 4467 df-sn 4568 df-pr 4570 df-op 4574 df-uni 4851 df-iun 4935 df-br 5086 df-opab 5148 df-mpt 5167 df-id 5526 df-xp 5637 df-rel 5638 df-cnv 5639 df-co 5640 df-dm 5641 df-rn 5642 df-res 5643 df-ima 5644 df-iota 6454 df-fun 6500 df-fn 6501 df-f 6502 df-f1 6503 df-fo 6504 df-f1o 6505 df-fv 6506 |
| This theorem is referenced by: fexd 7182 f1oexrnex 7878 fsuppeq 8125 suppsnop 8128 f1domg 8918 ffsuppbi 9311 mapfienlem2 9319 oiexg 9450 infxpenc2lem2 9942 isf32lem10 10284 hasheqf1oi 14313 hashf1rn 14314 hashimarn 14402 iswrd 14477 climsup 15632 fsum 15682 supcvg 15821 fprod 15906 vdwmc 16949 vdwpc 16951 isghmOLD 19191 elsymgbas 19349 gsumval3a 19878 gsumval3lem1 19880 gsumval3lem2 19881 dmdprd 19975 cnfldfun 21366 cnfldfunALT 21367 tngngp3 24621 climcncf 24867 ulmval 26345 pserulm 26387 elnoOLD 27610 isismt 28602 isgrpoi 30569 isvcOLD 30650 isnv 30683 cnnvg 30749 cnnvs 30751 cnnvnm 30752 cncph 30890 ajval 30932 hvmulex 31082 hhph 31249 hlimi 31259 chlimi 31305 hhssva 31328 hhsssm 31329 hhssnm 31330 hhshsslem1 31338 elunop 31943 adjeq 32006 leoprf2 32198 fpwrelmapffslem 32805 ccatws1f1o 33011 lmdvg 34097 esumpfinvallem 34218 omsf 34440 eulerpartgbij 34516 eulerpartlemmf 34519 subfacp1lem5 35366 sinccvglem 35854 poimirlem24 37965 mbfresfi 37987 elghomlem2OLD 38207 islaut 40529 ispautN 40545 istendo 41206 binomcxplemnotnn0 44783 climexp 46035 climinf 46036 stirlinglem8 46509 fourierdlem70 46604 ismea 46879 meadjiunlem 46893 grtriclwlk3 48421 isassintop 48686 fdivmpt 49016 elbigolo1 49033 fucofvalne 49800 |
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