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| Mirrors > Home > ILE Home > Th. List > elab2g | GIF version | ||
| Description: Membership in a class abstraction, using implicit substitution. (Contributed by NM, 13-Sep-1995.) |
| Ref | Expression |
|---|---|
| elab2g.1 | ⊢ (𝑥 = 𝐴 → (𝜑 ↔ 𝜓)) |
| elab2g.2 | ⊢ 𝐵 = {𝑥 ∣ 𝜑} |
| Ref | Expression |
|---|---|
| elab2g | ⊢ (𝐴 ∈ 𝑉 → (𝐴 ∈ 𝐵 ↔ 𝜓)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | elab2g.2 | . . 3 ⊢ 𝐵 = {𝑥 ∣ 𝜑} | |
| 2 | 1 | eleq2i 2305 | . 2 ⊢ (𝐴 ∈ 𝐵 ↔ 𝐴 ∈ {𝑥 ∣ 𝜑}) |
| 3 | elab2g.1 | . . 3 ⊢ (𝑥 = 𝐴 → (𝜑 ↔ 𝜓)) | |
| 4 | 3 | elabg 2972 | . 2 ⊢ (𝐴 ∈ 𝑉 → (𝐴 ∈ {𝑥 ∣ 𝜑} ↔ 𝜓)) |
| 5 | 2, 4 | bitrid 192 | 1 ⊢ (𝐴 ∈ 𝑉 → (𝐴 ∈ 𝐵 ↔ 𝜓)) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 ↔ wb 105 = wceq 1402 ∈ wcel 2209 {cab 2224 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-io 721 ax-5 1500 ax-7 1501 ax-gen 1502 ax-ie1 1546 ax-ie2 1547 ax-8 1557 ax-10 1558 ax-11 1559 ax-i12 1560 ax-bndl 1562 ax-4 1563 ax-17 1579 ax-i9 1583 ax-ial 1587 ax-i5r 1588 ax-ext 2220 |
| This theorem depends on definitions: df-bi 117 df-tru 1405 df-nf 1514 df-sb 1816 df-clab 2225 df-cleq 2231 df-clel 2234 df-nfc 2381 df-v 2823 |
| This theorem is referenced by: elab2 2974 elab4g 2975 eldif 3229 elun 3370 elin 3412 elif 3652 elsng 3723 elprg 3728 eluni 3936 eliun 4014 eliin 4015 elopab 4398 elong 4516 opeliunxp 4828 elrn2g 4968 eldmg 4974 elrnmpt 5029 elrnmpt1 5031 elimag 5128 elrnmpog 6195 eloprabi 6426 tfrlem3ag 6574 tfr1onlem3ag 6602 tfrcllemsucaccv 6619 elqsg 6853 elixp2 6978 isomni 7470 ismkv 7487 iswomni 7499 isacnm 7553 1idprl 7951 1idpru 7952 recexprlemell 7983 recexprlemelu 7984 mertenslemub 12284 mertenslemi1 12285 mertenslem2 12286 4sqexercise1 13160 4sqexercise2 13161 4sqlemsdc 13162 ballotfilemfmpn 13217 ismgm 13660 istopg 15083 isbasisg 15128 2sqlem8 16225 2sqlem9 16226 isuhgrm 16295 isushgrm 16296 isupgren 16319 isumgren 16329 isuspgren 16381 isusgren 16382 |
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