| Intuitionistic Logic Explorer |
< Previous
Next >
Nearby theorems |
||
| 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 4400 elong 4518 opeliunxp 4830 elrn2g 4970 eldmg 4976 elrnmpt 5031 elrnmpt1 5033 elimag 5130 elrnmpog 6201 eloprabi 6432 tfrlem3ag 6580 tfr1onlem3ag 6608 tfrcllemsucaccv 6625 elqsg 6859 elixp2 6984 isomni 7477 ismkv 7494 iswomni 7506 isacnm 7560 1idprl 7958 1idpru 7959 recexprlemell 7990 recexprlemelu 7991 mertenslemub 12319 mertenslemi1 12320 mertenslem2 12321 4sqexercise1 13199 4sqexercise2 13200 4sqlemsdc 13201 ballotfilemfmpn 13285 ismgm 13728 istopg 15152 isbasisg 15197 2sqlem8 16364 2sqlem9 16365 isuhgrm 16434 isushgrm 16435 isupgren 16458 isumgren 16468 isuspgren 16520 isusgren 16521 |
| Copyright terms: Public domain | W3C validator |