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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 6712 | . 2 ⊢ (𝐹:𝐴⟶𝐵 → 𝐹 Fn 𝐴) | |
| 2 | fnex 7225 | . 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 2144 Vcvv 3450 Fn wfn 6536 ⟶wf 6537 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1827 ax-4 1841 ax-5 1942 ax-6 1999 ax-7 2040 ax-8 2146 ax-9 2154 ax-10 2177 ax-11 2193 ax-12 2212 ax-ext 2732 ax-rep 5231 ax-sep 5248 ax-nul 5259 ax-pr 5390 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3an 1105 df-tru 1572 df-fal 1582 df-ex 1812 df-nf 1816 df-sb 2099 df-mo 2564 df-eu 2594 df-clab 2739 df-cleq 2752 df-clel 2835 df-nfc 2909 df-ne 2956 df-ral 3077 df-rex 3087 df-reu 3366 df-rab 3413 df-v 3452 df-sbc 3739 df-csb 3848 df-ss 3897 df-dif 4046 df-in 4090 df-un 4150 df-nul 4278 df-if 4482 df-sn 4585 df-pr 4587 df-op 4835 df-uni 4867 df-iun 4952 df-br 5103 df-opab 5167 df-mpt 5186 df-id 5545 df-xp 5656 df-rel 5657 df-cnv 5658 df-co 5659 df-dm 5660 df-rn 5661 df-res 5662 df-ima 5663 df-iota 6496 df-fun 6543 df-fn 6544 df-f 6545 df-f1 6546 df-fo 6547 df-f1o 6548 df-fv 6549 |
| This theorem is used by: fexd 7235 f1oexrnex 7941 fsuppeq 8197 suppsnop 8200 f1domg 9003 ffsuppbi 9395 mapfienlem2 9403 oiexg 9534 infxpenc2lem2 10104 isf32lem10 10445 hasheqf1oi 14500 hashf1rn 14501 hashimarn 14590 iswrd 14665 climsup 15844 fsum 15893 supcvg 16032 fprod 16115 vdwmc 17163 vdwpc 17165 elsymgbas 19595 gsumval3a 20124 gsumval3lem1 20126 gsumval3lem2 20127 dmdprd 20221 cnfldfun 21699 cnfldfunALT 21700 tngngp3 24982 climcncf 25228 ulmval 26714 pserulm 26756 isismt 29004 isgrpoi 31107 isvcOLD 31188 isnv 31221 cnnvg 31287 cnnvs 31289 cnnvnm 31290 cncph 31428 ajval 31470 hvmulex 31620 hhph 31787 hlimi 31797 chlimi 31843 hhssva 31866 hhsssm 31867 hhssnm 31868 hhshsslem1 31876 elunop 32481 adjeq 32544 leoprf2 32736 fpwrelmapffslem 33372 ccatws1f1o 33562 lmdvg 34633 esumpfinvallem 34754 omsf 34976 eulerpartgbij 35052 eulerpartlemmf 35055 subfacp1lem5 36037 sinccvglem 36525 poimirlem24 38669 mbfresfi 38691 elghomlem2OLD 38927 islaut 41247 ispautN 41263 istendo 41924 binomcxplemnotnn0 45447 climexp 46724 climinf 46725 stirlinglem8 47198 fourierdlem70 47293 ismea 47568 meadjiunlem 47582 grtriclwlk3 49150 isassintop 49414 fdivmpt 49759 elbigolo1 49776 fucofvalne 50554 |
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