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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 |
| This proof depends on syntax axioms: → wi 4 ↔ wb 105 = wceq 1402 ∈ wcel 2209 {cab 2224 |
| This proof depends on 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 proof 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 used by: elab2 2974 elab4g 2975 eldif 3229 elun 3370 elin 3412 elif 3652 elsng 3724 elprg 3729 eluni 3938 eliun 4016 eliin 4017 elopab 4402 elong 4520 opeliunxp 4832 elrn2g 4972 eldmg 4978 elrnmpt 5033 elrnmpt1 5035 elimag 5133 elrnmpog 6204 eloprabi 6436 tfrlem3ag 6585 tfr1onlem3ag 6613 tfrcllemsucaccv 6630 elqsg 6864 elixp2 6990 isomni 7483 ismkv 7500 iswomni 7512 isacnm 7566 1idprl 7964 1idpru 7965 recexprlemell 7996 recexprlemelu 7997 mertenslemub 12326 mertenslemi1 12327 mertenslem2 12328 4sqexercise1 13206 4sqexercise2 13207 4sqlemsdc 13208 ballotfilemfmpn 13292 ismgm 13736 istopg 15258 isbasisg 15303 2sqlem8 16480 2sqlem9 16481 isuhgrm 16550 isushgrm 16551 isupgren 16574 isumgren 16584 isuspgren 16636 isusgren 16637 |
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