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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 2296 | . 2 ⊢ (𝐴 ∈ 𝐵 ↔ 𝐴 ∈ {𝑥 ∣ 𝜑}) |
| 3 | elab2g.1 | . . 3 ⊢ (𝑥 = 𝐴 → (𝜑 ↔ 𝜓)) | |
| 4 | 3 | elabg 2950 | . 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 1395 ∈ wcel 2200 {cab 2215 |
| 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 714 ax-5 1493 ax-7 1494 ax-gen 1495 ax-ie1 1539 ax-ie2 1540 ax-8 1550 ax-10 1551 ax-11 1552 ax-i12 1553 ax-bndl 1555 ax-4 1556 ax-17 1572 ax-i9 1576 ax-ial 1580 ax-i5r 1581 ax-ext 2211 |
| This theorem depends on definitions: df-bi 117 df-tru 1398 df-nf 1507 df-sb 1809 df-clab 2216 df-cleq 2222 df-clel 2225 df-nfc 2361 df-v 2802 |
| This theorem is referenced by: elab2 2952 elab4g 2953 eldif 3207 elun 3346 elin 3388 elif 3615 elsng 3682 elprg 3687 eluni 3894 eliun 3972 eliin 3973 elopab 4350 elong 4468 opeliunxp 4779 elrn2g 4918 eldmg 4924 elrnmpt 4979 elrnmpt1 4981 elimag 5078 elrnmpog 6129 eloprabi 6356 tfrlem3ag 6470 tfr1onlem3ag 6498 tfrcllemsucaccv 6515 elqsg 6749 elixp2 6866 isomni 7329 ismkv 7346 iswomni 7358 isacnm 7411 1idprl 7803 1idpru 7804 recexprlemell 7835 recexprlemelu 7836 mertenslemub 12088 mertenslemi1 12089 mertenslem2 12090 4sqexercise1 12964 4sqexercise2 12965 4sqlemsdc 12966 ismgm 13433 istopg 14716 isbasisg 14761 2sqlem8 15845 2sqlem9 15846 isuhgrm 15915 isushgrm 15916 isupgren 15939 isumgren 15949 isuspgren 16001 isusgren 16002 |
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