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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 6584 tfr1onlem3ag 6612 tfrcllemsucaccv 6629 elqsg 6863 elixp2 6989 isomni 7483 ismkv 7500 iswomni 7512 isacnm 7566 1idprl 7964 1idpru 7965 recexprlemell 7996 recexprlemelu 7997 mertenslemub 12327 mertenslemi1 12328 mertenslem2 12329 4sqexercise1 13207 4sqexercise2 13208 4sqlemsdc 13209 ballotfilemfmpn 13293 ismgm 13737 istopg 15237 isbasisg 15282 2sqlem8 16459 2sqlem9 16460 isuhgrm 16529 isushgrm 16530 isupgren 16553 isumgren 16563 isuspgren 16615 isusgren 16616 |
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