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Mirrors > Home > ILE Home > Th. List > elex | GIF version |
Description: If a class is a member of another class, then it is a set. Theorem 6.12 of [Quine] p. 44. (Contributed by NM, 5-Aug-1993.) (Proof shortened by Andrew Salmon, 8-Jun-2011.) |
Ref | Expression |
---|---|
elex | ⊢ (𝐴 ∈ 𝐵 → 𝐴 ∈ V) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | exsimpl 1596 | . 2 ⊢ (∃𝑥(𝑥 = 𝐴 ∧ 𝑥 ∈ 𝐵) → ∃𝑥 𝑥 = 𝐴) | |
2 | df-clel 2135 | . 2 ⊢ (𝐴 ∈ 𝐵 ↔ ∃𝑥(𝑥 = 𝐴 ∧ 𝑥 ∈ 𝐵)) | |
3 | isset 2692 | . 2 ⊢ (𝐴 ∈ V ↔ ∃𝑥 𝑥 = 𝐴) | |
4 | 1, 2, 3 | 3imtr4i 200 | 1 ⊢ (𝐴 ∈ 𝐵 → 𝐴 ∈ V) |
Colors of variables: wff set class |
Syntax hints: → wi 4 ∧ wa 103 = wceq 1331 ∃wex 1468 ∈ wcel 1480 Vcvv 2686 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-5 1423 ax-gen 1425 ax-ie1 1469 ax-ie2 1470 ax-8 1482 ax-4 1487 ax-17 1506 ax-i9 1510 ax-ial 1514 ax-ext 2121 |
This theorem depends on definitions: df-bi 116 df-sb 1736 df-clab 2126 df-cleq 2132 df-clel 2135 df-v 2688 |
This theorem is referenced by: elexi 2698 elexd 2699 elisset 2700 vtoclgft 2736 vtoclgf 2744 vtoclg1f 2745 vtocl2gf 2748 vtocl3gf 2749 spcimgft 2762 spcimegft 2764 elab4g 2833 elrabf 2838 mob 2866 sbcex 2917 sbcel1v 2971 sbcabel 2990 csbcomg 3025 csbvarg 3030 csbiebt 3039 csbnestgf 3052 csbidmg 3056 sbcco3g 3057 csbco3g 3058 eldif 3080 ssv 3119 elun 3217 elin 3259 elpwb 3520 snidb 3555 dfopg 3703 eluni 3739 eliun 3817 csbexga 4056 nvel 4061 class2seteq 4087 axpweq 4095 snelpwi 4134 opexg 4150 elopab 4180 epelg 4212 elon2 4298 unexg 4364 reuhypd 4392 sucexg 4414 sucelon 4419 onsucelsucr 4424 sucunielr 4426 en2lp 4469 peano2 4509 peano2b 4528 opelvvg 4588 opeliunxp 4594 opeliunxp2 4679 ideqg 4690 elrnmptg 4791 imasng 4904 iniseg 4911 opswapg 5025 elxp4 5026 elxp5 5027 dmmptg 5036 iota2 5114 fnmpt 5249 fvexg 5440 fvelimab 5477 mptfvex 5506 fvmptdf 5508 fvmptdv2 5510 mpteqb 5511 fvmptt 5512 fvmptf 5513 fvopab6 5517 fsn2 5594 fmptpr 5612 eloprabga 5858 ovmpos 5894 ov2gf 5895 ovmpodxf 5896 ovmpox 5899 ovmpoga 5900 ovmpodf 5902 ovi3 5907 ovelrn 5919 suppssfv 5978 suppssov1 5979 offval3 6032 1stexg 6065 2ndexg 6066 elxp6 6067 elxp7 6068 releldm2 6083 fnmpo 6100 mpofvex 6101 mpoexg 6109 opeliunxp2f 6135 brtpos2 6148 rdgtfr 6271 rdgruledefgg 6272 frec0g 6294 sucinc2 6342 nntri3or 6389 relelec 6469 ecdmn0m 6471 mapvalg 6552 pmvalg 6553 elpmg 6558 elixp2 6596 mptelixpg 6628 elixpsn 6629 map1 6706 mapdom1g 6741 mapxpen 6742 fival 6858 elfi2 6860 djulclr 6934 djurclr 6935 djulcl 6936 djurcl 6937 djulclb 6940 inl11 6950 djuss 6955 1stinl 6959 2ndinl 6960 1stinr 6961 2ndinr 6962 ismkvnex 7029 elinp 7282 addnqprlemfl 7367 addnqprlemfu 7368 mulnqprlemfl 7383 mulnqprlemfu 7384 recexprlemell 7430 recexprlemelu 7431 shftfvalg 10590 clim 11050 climmpt 11069 climshft2 11075 isstruct2r 11970 slotex 11986 setsvalg 11989 setsfun0 11995 setscom 11999 restval 12126 topnvalg 12132 toponsspwpwg 12189 tgval 12218 eltg 12221 eltg2 12222 restbasg 12337 tgrest 12338 txvalex 12423 txval 12424 ispsmet 12492 ismet 12513 isxmet 12514 xmetunirn 12527 blfvalps 12554 bj-vtoclgft 12982 djucllem 13007 bj-nvel 13095 |
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