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| Mirrors > Home > ILE Home > Th. List > optocl | GIF version | ||
| Description: Implicit substitution of class for ordered pair. (Contributed by NM, 5-Mar-1995.) |
| Ref | Expression |
|---|---|
| optocl.1 | ⊢ 𝐷 = (𝐵 × 𝐶) |
| optocl.2 | ⊢ (〈𝑥, 𝑦〉 = 𝐴 → (𝜑 ↔ 𝜓)) |
| optocl.3 | ⊢ ((𝑥 ∈ 𝐵 ∧ 𝑦 ∈ 𝐶) → 𝜑) |
| Ref | Expression |
|---|---|
| optocl | ⊢ (𝐴 ∈ 𝐷 → 𝜓) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | elxp3 4717 | . . 3 ⊢ (𝐴 ∈ (𝐵 × 𝐶) ↔ ∃𝑥∃𝑦(〈𝑥, 𝑦〉 = 𝐴 ∧ 〈𝑥, 𝑦〉 ∈ (𝐵 × 𝐶))) | |
| 2 | opelxp 4693 | . . . . . . 7 ⊢ (〈𝑥, 𝑦〉 ∈ (𝐵 × 𝐶) ↔ (𝑥 ∈ 𝐵 ∧ 𝑦 ∈ 𝐶)) | |
| 3 | optocl.3 | . . . . . . 7 ⊢ ((𝑥 ∈ 𝐵 ∧ 𝑦 ∈ 𝐶) → 𝜑) | |
| 4 | 2, 3 | sylbi 121 | . . . . . 6 ⊢ (〈𝑥, 𝑦〉 ∈ (𝐵 × 𝐶) → 𝜑) |
| 5 | optocl.2 | . . . . . 6 ⊢ (〈𝑥, 𝑦〉 = 𝐴 → (𝜑 ↔ 𝜓)) | |
| 6 | 4, 5 | imbitrid 154 | . . . . 5 ⊢ (〈𝑥, 𝑦〉 = 𝐴 → (〈𝑥, 𝑦〉 ∈ (𝐵 × 𝐶) → 𝜓)) |
| 7 | 6 | imp 124 | . . . 4 ⊢ ((〈𝑥, 𝑦〉 = 𝐴 ∧ 〈𝑥, 𝑦〉 ∈ (𝐵 × 𝐶)) → 𝜓) |
| 8 | 7 | exlimivv 1911 | . . 3 ⊢ (∃𝑥∃𝑦(〈𝑥, 𝑦〉 = 𝐴 ∧ 〈𝑥, 𝑦〉 ∈ (𝐵 × 𝐶)) → 𝜓) |
| 9 | 1, 8 | sylbi 121 | . 2 ⊢ (𝐴 ∈ (𝐵 × 𝐶) → 𝜓) |
| 10 | optocl.1 | . 2 ⊢ 𝐷 = (𝐵 × 𝐶) | |
| 11 | 9, 10 | eleq2s 2291 | 1 ⊢ (𝐴 ∈ 𝐷 → 𝜓) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 ∧ wa 104 ↔ wb 105 = wceq 1364 ∃wex 1506 ∈ wcel 2167 〈cop 3625 × cxp 4661 |
| 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 4151 ax-pow 4207 ax-pr 4242 |
| 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-ral 2480 df-rex 2481 df-v 2765 df-un 3161 df-in 3163 df-ss 3170 df-pw 3607 df-sn 3628 df-pr 3629 df-op 3631 df-opab 4095 df-xp 4669 |
| This theorem is referenced by: 2optocl 4740 3optocl 4741 ecoptocl 6681 ax1rid 7944 ax0id 7945 axcnre 7948 |
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