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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 6709 | . 2 ⊢ (𝐹:𝐴⟶𝐵 → 𝐹 Fn 𝐴) | |
| 2 | fnex 7219 | . 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 2146 Vcvv 3457 Fn wfn 6535 ⟶wf 6536 |
| 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 1943 ax-6 2000 ax-7 2041 ax-8 2148 ax-9 2156 ax-10 2179 ax-11 2195 ax-12 2216 ax-ext 2737 ax-rep 5240 ax-sep 5259 ax-nul 5271 ax-pr 5406 |
| 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 2100 df-mo 2569 df-eu 2599 df-clab 2744 df-cleq 2757 df-clel 2840 df-nfc 2914 df-ne 2961 df-ral 3082 df-rex 3092 df-reu 3372 df-rab 3419 df-v 3459 df-sbc 3747 df-csb 3855 df-dif 3909 df-un 3911 df-in 3913 df-ss 3923 df-nul 4287 df-if 4490 df-sn 4592 df-pr 4594 df-op 4598 df-uni 4875 df-iun 4960 df-br 5112 df-opab 5176 df-mpt 5195 df-id 5558 df-xp 5669 df-rel 5670 df-cnv 5671 df-co 5672 df-dm 5673 df-rn 5674 df-res 5675 df-ima 5676 df-iota 6496 df-fun 6542 df-fn 6543 df-f 6544 df-f1 6545 df-fo 6546 df-f1o 6547 df-fv 6548 |
| This theorem is used by: fexd 7229 f1oexrnex 7926 fsuppeq 8173 suppsnop 8176 f1domg 8970 ffsuppbi 9361 mapfienlem2 9369 oiexg 9500 infxpenc2lem2 10016 isf32lem10 10357 hasheqf1oi 14401 hashf1rn 14402 hashimarn 14491 iswrd 14566 climsup 15741 fsum 15790 supcvg 15929 fprod 16014 vdwmc 17056 vdwpc 17058 elsymgbas 19468 gsumval3a 19997 gsumval3lem1 19999 gsumval3lem2 20000 dmdprd 20094 cnfldfun 21566 cnfldfunALT 21567 tngngp3 24844 climcncf 25090 ulmval 26574 pserulm 26616 isismt 28834 isgrpoi 30897 isvcOLD 30978 isnv 31011 cnnvg 31077 cnnvs 31079 cnnvnm 31080 cncph 31218 ajval 31260 hvmulex 31410 hhph 31577 hlimi 31587 chlimi 31633 hhssva 31656 hhsssm 31657 hhssnm 31658 hhshsslem1 31666 elunop 32271 adjeq 32334 leoprf2 32526 fpwrelmapffslem 33123 ccatws1f1o 33313 lmdvg 34383 esumpfinvallem 34504 omsf 34727 eulerpartgbij 34803 eulerpartlemmf 34806 subfacp1lem5 35689 sinccvglem 36177 poimirlem24 38328 mbfresfi 38350 elghomlem2OLD 38570 islaut 40890 ispautN 40906 istendo 41567 binomcxplemnotnn0 45099 climexp 46354 climinf 46355 stirlinglem8 46828 fourierdlem70 46923 ismea 47198 meadjiunlem 47212 grtriclwlk3 48743 isassintop 49008 fdivmpt 49353 elbigolo1 49370 fucofvalne 50136 |
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