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| Mirrors > Home > ILE Home > Th. List > elab | GIF version | ||
| Description: Membership in a class abstraction, using implicit substitution. Compare Theorem 6.13 of [Quine] p. 44. (Contributed by NM, 1-Aug-1994.) |
| Ref | Expression |
|---|---|
| elab.1 | ⊢ 𝐴 ∈ V |
| elab.2 | ⊢ (𝑥 = 𝐴 → (𝜑 ↔ 𝜓)) |
| Ref | Expression |
|---|---|
| elab | ⊢ (𝐴 ∈ {𝑥 ∣ 𝜑} ↔ 𝜓) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | nfv 1581 | . 2 ⊢ Ⅎ𝑥𝜓 | |
| 2 | elab.1 | . 2 ⊢ 𝐴 ∈ V | |
| 3 | elab.2 | . 2 ⊢ (𝑥 = 𝐴 → (𝜑 ↔ 𝜓)) | |
| 4 | 1, 2, 3 | elabf 2969 | 1 ⊢ (𝐴 ∈ {𝑥 ∣ 𝜑} ↔ 𝜓) |
| Colors of variables: wff set class |
| This proof depends on syntax axioms: → wi 4 ↔ wb 105 = wceq 1402 ∈ wcel 2209 {cab 2224 Vcvv 2821 |
| 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: ralab 2986 rexab 2988 intab 3999 dfiin2g 4045 dfiunv2 4048 uniuni 4599 dcextest 4730 peano5 4747 finds 4749 finds2 4750 funcnvuni 5453 fun11iun 5663 elabrex 5966 abrexco 5968 mapfset 6950 mapfoss 6952 fsetsspwxp 6953 mapval2 6964 ssenen 7158 snexxph 7274 sbthlem2 7282 f1setfi 7322 indpi 7715 nqprm 7915 nqprrnd 7916 nqprdisj 7917 nqprloc 7918 nqprl 7924 nqpru 7925 cauappcvgprlem2 8033 caucvgprlem2 8053 peano1nnnn 8225 peano2nnnn 8226 1nn 9324 peano2nn 9325 dfuzi 9766 hashfacen 11305 hashf1lem1 11306 hashf1lem2 11307 shftfvalg 11604 ovshftex 11605 shftfval 11607 4sqlemafi 13202 lss1d 14828 txdis1cn 15521 ushgredgedg 16689 ushgredgedgloop 16691 bj-ssom 17184 |
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