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| Mirrors > Home > ILE Home > Th. List > elvv | GIF version | ||
| Description: Membership in universal class of ordered pairs. (Contributed by NM, 4-Jul-1994.) |
| Ref | Expression |
|---|---|
| elvv | ⊢ (𝐴 ∈ (V × V) ↔ ∃𝑥∃𝑦 𝐴 = 〈𝑥, 𝑦〉) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | elxp 4681 | . 2 ⊢ (𝐴 ∈ (V × V) ↔ ∃𝑥∃𝑦(𝐴 = 〈𝑥, 𝑦〉 ∧ (𝑥 ∈ V ∧ 𝑦 ∈ V))) | |
| 2 | vex 2766 | . . . . 5 ⊢ 𝑥 ∈ V | |
| 3 | vex 2766 | . . . . 5 ⊢ 𝑦 ∈ V | |
| 4 | 2, 3 | pm3.2i 272 | . . . 4 ⊢ (𝑥 ∈ V ∧ 𝑦 ∈ V) |
| 5 | 4 | biantru 302 | . . 3 ⊢ (𝐴 = 〈𝑥, 𝑦〉 ↔ (𝐴 = 〈𝑥, 𝑦〉 ∧ (𝑥 ∈ V ∧ 𝑦 ∈ V))) |
| 6 | 5 | 2exbii 1620 | . 2 ⊢ (∃𝑥∃𝑦 𝐴 = 〈𝑥, 𝑦〉 ↔ ∃𝑥∃𝑦(𝐴 = 〈𝑥, 𝑦〉 ∧ (𝑥 ∈ V ∧ 𝑦 ∈ V))) |
| 7 | 1, 6 | bitr4i 187 | 1 ⊢ (𝐴 ∈ (V × V) ↔ ∃𝑥∃𝑦 𝐴 = 〈𝑥, 𝑦〉) |
| Colors of variables: wff set class |
| Syntax hints: ∧ wa 104 ↔ wb 105 = wceq 1364 ∃wex 1506 ∈ wcel 2167 Vcvv 2763 〈cop 3626 × cxp 4662 |
| 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 710 ax-5 1461 ax-7 1462 ax-gen 1463 ax-ie1 1507 ax-ie2 1508 ax-8 1518 ax-10 1519 ax-11 1520 ax-i12 1521 ax-bndl 1523 ax-4 1524 ax-17 1540 ax-i9 1544 ax-ial 1548 ax-i5r 1549 ax-14 2170 ax-ext 2178 ax-sep 4152 ax-pow 4208 ax-pr 4243 |
| This theorem depends on definitions: df-bi 117 df-3an 982 df-tru 1367 df-nf 1475 df-sb 1777 df-clab 2183 df-cleq 2189 df-clel 2192 df-nfc 2328 df-v 2765 df-un 3161 df-in 3163 df-ss 3170 df-pw 3608 df-sn 3629 df-pr 3630 df-op 3632 df-opab 4096 df-xp 4670 |
| This theorem is referenced by: elvvv 4727 elvvuni 4728 ssrel 4752 elrel 4766 relop 4817 elreldm 4893 dmsnm 5136 1stval2 6222 2ndval2 6223 dfopab2 6256 dfoprab3s 6257 dftpos4 6330 tpostpos 6331 fundmen 6874 |
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