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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 6739 | . 2 ⊢ (𝐹:𝐴⟶𝐵 → 𝐹 Fn 𝐴) | |
| 2 | fnex 7254 | . 2 ⊢ ((𝐹 Fn 𝐴 ∧ 𝐴 ∈ 𝐶) → 𝐹 ∈ V) | |
| 3 | 1, 2 | sylan 592 | 1 ⊢ ((𝐹:𝐴⟶𝐵 ∧ 𝐴 ∈ 𝐶) → 𝐹 ∈ V) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ∧ wa 401 ∈ wcel 2147 Vcvv 3454 Fn wfn 6561 ⟶wf 6562 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1945 ax-6 2002 ax-7 2043 ax-8 2149 ax-9 2157 ax-10 2180 ax-11 2197 ax-12 2216 ax-ext 2735 ax-rep 5238 ax-sep 5255 ax-nul 5266 ax-pr 5398 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-nf 1817 df-sb 2102 df-mo 2567 df-eu 2597 df-clab 2742 df-cleq 2755 df-clel 2839 df-nfc 2913 df-ne 2960 df-ral 3081 df-rex 3091 df-reu 3370 df-rab 3417 df-v 3456 df-sbc 3743 df-csb 3852 df-ss 3901 df-dif 4050 df-in 4094 df-un 4154 df-nul 4282 df-if 4486 df-sn 4589 df-pr 4591 df-op 4841 df-uni 4873 df-iun 4958 df-br 5109 df-opab 5174 df-mpt 5193 df-id 5553 df-xp 5664 df-rel 5665 df-cnv 5666 df-co 5667 df-dm 5668 df-rn 5669 df-res 5670 df-ima 5671 df-iota 6520 df-fun 6568 df-fn 6569 df-f 6570 df-f1 6571 df-fo 6572 df-f1o 6573 df-fv 6574 |
| This theorem is used by: fexd 7264 f1oexrnex 7973 fsuppeq 8230 suppsnop 8233 f1domg 9036 ffsuppbi 9427 mapfienlem2 9435 oiexg 9566 infxpenc2lem2 10138 isf32lem10 10479 hasheqf1oi 14536 hashf1rn 14537 hashimarn 14626 iswrd 14701 climsup 15881 fsum 15930 supcvg 16069 fprod 16152 vdwmc 17200 vdwpc 17202 elsymgbas 19639 gsumval3a 20168 gsumval3lem1 20170 gsumval3lem2 20171 dmdprd 20265 cnfldfun 21744 cnfldfunALT 21745 tngngp3 25030 climcncf 25276 ulmval 26764 pserulm 26806 isismt 29054 isgrpoi 31157 isvcOLD 31238 isnv 31271 cnnvg 31337 cnnvs 31339 cnnvnm 31340 cncph 31478 ajval 31520 hvmulex 31670 hhph 31837 hlimi 31847 chlimi 31893 hhssva 31916 hhsssm 31917 hhssnm 31918 hhshsslem1 31926 elunop 32531 adjeq 32594 leoprf2 32786 fpwrelmapffslem 33420 ccatws1f1o 33610 lmdvg 34696 esumpfinvallem 34817 omsf 35039 eulerpartgbij 35115 eulerpartlemmf 35118 subfacp1lem5 36157 sinccvglem 36645 poimirlem24 38830 mbfresfi 38852 elghomlem2OLD 39086 islaut 41406 ispautN 41422 istendo 42083 binomcxplemnotnn0 45601 climexp 46890 climinf 46891 stirlinglem8 47364 fourierdlem70 47459 ismea 47734 meadjiunlem 47748 grtriclwlk3 49316 isassintop 49580 fdivmpt 49983 elbigolo1 50000 fucofvalne 50778 |
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