Intuitionistic Logic Explorer |
< Previous
Next >
Nearby theorems |
||
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 1597 | . 2 ⊢ (∃𝑥(𝑥 = 𝐴 ∧ 𝑥 ∈ 𝐵) → ∃𝑥 𝑥 = 𝐴) | |
2 | df-clel 2136 | . 2 ⊢ (𝐴 ∈ 𝐵 ↔ ∃𝑥(𝑥 = 𝐴 ∧ 𝑥 ∈ 𝐵)) | |
3 | isset 2695 | . 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 1332 ∃wex 1469 ∈ wcel 1481 Vcvv 2689 |
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 1424 ax-gen 1426 ax-ie1 1470 ax-ie2 1471 ax-8 1483 ax-4 1488 ax-17 1507 ax-i9 1511 ax-ial 1515 ax-ext 2122 |
This theorem depends on definitions: df-bi 116 df-sb 1737 df-clab 2127 df-cleq 2133 df-clel 2136 df-v 2691 |
This theorem is referenced by: elexi 2701 elexd 2702 elisset 2703 vtoclgft 2739 vtoclgf 2747 vtoclg1f 2748 vtocl2gf 2751 vtocl3gf 2752 spcimgft 2765 spcimegft 2767 elab4g 2837 elrabf 2842 mob 2870 sbcex 2921 sbcel1v 2975 sbcabel 2994 csbcomg 3030 csbvarg 3035 csbiebt 3044 csbnestgf 3057 csbidmg 3061 sbcco3g 3062 csbco3g 3063 eldif 3085 ssv 3124 elun 3222 elin 3264 elpwb 3525 snidb 3562 dfopg 3711 eluni 3747 eliun 3825 csbexga 4064 nvel 4069 class2seteq 4095 axpweq 4103 snelpwi 4142 opexg 4158 elopab 4188 epelg 4220 elon2 4306 unexg 4372 reuhypd 4400 sucexg 4422 sucelon 4427 onsucelsucr 4432 sucunielr 4434 en2lp 4477 peano2 4517 peano2b 4536 opelvvg 4596 opeliunxp 4602 opeliunxp2 4687 ideqg 4698 elrnmptg 4799 imasng 4912 iniseg 4919 opswapg 5033 elxp4 5034 elxp5 5035 dmmptg 5044 iota2 5122 fnmpt 5257 fvexg 5448 fvelimab 5485 mptfvex 5514 fvmptdf 5516 fvmptdv2 5518 mpteqb 5519 fvmptt 5520 fvmptf 5521 fvopab6 5525 fsn2 5602 fmptpr 5620 eloprabga 5866 ovmpos 5902 ov2gf 5903 ovmpodxf 5904 ovmpox 5907 ovmpoga 5908 ovmpodf 5910 ovi3 5915 ovelrn 5927 suppssfv 5986 suppssov1 5987 offval3 6040 1stexg 6073 2ndexg 6074 elxp6 6075 elxp7 6076 releldm2 6091 fnmpo 6108 mpofvex 6109 mpoexg 6117 opeliunxp2f 6143 brtpos2 6156 rdgtfr 6279 rdgruledefgg 6280 frec0g 6302 sucinc2 6350 nntri3or 6397 relelec 6477 ecdmn0m 6479 mapvalg 6560 pmvalg 6561 elpmg 6566 elixp2 6604 mptelixpg 6636 elixpsn 6637 map1 6714 mapdom1g 6749 mapxpen 6750 fival 6866 elfi2 6868 djulclr 6942 djurclr 6943 djulcl 6944 djurcl 6945 djulclb 6948 inl11 6958 djuss 6963 1stinl 6967 2ndinl 6968 1stinr 6969 2ndinr 6970 ismkvnex 7037 omniwomnimkv 7049 cc4n 7103 elinp 7306 addnqprlemfl 7391 addnqprlemfu 7392 mulnqprlemfl 7407 mulnqprlemfu 7408 recexprlemell 7454 recexprlemelu 7455 shftfvalg 10622 clim 11082 climmpt 11101 climshft2 11107 isstruct2r 12009 slotex 12025 setsvalg 12028 setsfun0 12034 setscom 12038 restval 12165 topnvalg 12171 toponsspwpwg 12228 tgval 12257 eltg 12260 eltg2 12261 restbasg 12376 tgrest 12377 txvalex 12462 txval 12463 ispsmet 12531 ismet 12552 isxmet 12553 xmetunirn 12566 blfvalps 12593 bj-vtoclgft 13153 djucllem 13178 bj-nvel 13266 |
Copyright terms: Public domain | W3C validator |