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| Mirrors > Home > ILE Home > Th. List > dmopab3 | GIF version | ||
| Description: The domain of a restricted class of ordered pairs. (Contributed by NM, 31-Jan-2004.) |
| Ref | Expression |
|---|---|
| dmopab3 | ⊢ (∀𝑥 ∈ 𝐴 ∃𝑦𝜑 ↔ dom {〈𝑥, 𝑦〉 ∣ (𝑥 ∈ 𝐴 ∧ 𝜑)} = 𝐴) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | df-ral 2513 | . 2 ⊢ (∀𝑥 ∈ 𝐴 ∃𝑦𝜑 ↔ ∀𝑥(𝑥 ∈ 𝐴 → ∃𝑦𝜑)) | |
| 2 | pm4.71 389 | . . 3 ⊢ ((𝑥 ∈ 𝐴 → ∃𝑦𝜑) ↔ (𝑥 ∈ 𝐴 ↔ (𝑥 ∈ 𝐴 ∧ ∃𝑦𝜑))) | |
| 3 | 2 | albii 1516 | . 2 ⊢ (∀𝑥(𝑥 ∈ 𝐴 → ∃𝑦𝜑) ↔ ∀𝑥(𝑥 ∈ 𝐴 ↔ (𝑥 ∈ 𝐴 ∧ ∃𝑦𝜑))) |
| 4 | dmopab 4931 | . . . . 5 ⊢ dom {〈𝑥, 𝑦〉 ∣ (𝑥 ∈ 𝐴 ∧ 𝜑)} = {𝑥 ∣ ∃𝑦(𝑥 ∈ 𝐴 ∧ 𝜑)} | |
| 5 | 19.42v 1953 | . . . . . 6 ⊢ (∃𝑦(𝑥 ∈ 𝐴 ∧ 𝜑) ↔ (𝑥 ∈ 𝐴 ∧ ∃𝑦𝜑)) | |
| 6 | 5 | abbii 2345 | . . . . 5 ⊢ {𝑥 ∣ ∃𝑦(𝑥 ∈ 𝐴 ∧ 𝜑)} = {𝑥 ∣ (𝑥 ∈ 𝐴 ∧ ∃𝑦𝜑)} |
| 7 | 4, 6 | eqtri 2250 | . . . 4 ⊢ dom {〈𝑥, 𝑦〉 ∣ (𝑥 ∈ 𝐴 ∧ 𝜑)} = {𝑥 ∣ (𝑥 ∈ 𝐴 ∧ ∃𝑦𝜑)} |
| 8 | 7 | eqeq1i 2237 | . . 3 ⊢ (dom {〈𝑥, 𝑦〉 ∣ (𝑥 ∈ 𝐴 ∧ 𝜑)} = 𝐴 ↔ {𝑥 ∣ (𝑥 ∈ 𝐴 ∧ ∃𝑦𝜑)} = 𝐴) |
| 9 | eqcom 2231 | . . 3 ⊢ (𝐴 = {𝑥 ∣ (𝑥 ∈ 𝐴 ∧ ∃𝑦𝜑)} ↔ {𝑥 ∣ (𝑥 ∈ 𝐴 ∧ ∃𝑦𝜑)} = 𝐴) | |
| 10 | abeq2 2338 | . . 3 ⊢ (𝐴 = {𝑥 ∣ (𝑥 ∈ 𝐴 ∧ ∃𝑦𝜑)} ↔ ∀𝑥(𝑥 ∈ 𝐴 ↔ (𝑥 ∈ 𝐴 ∧ ∃𝑦𝜑))) | |
| 11 | 8, 9, 10 | 3bitr2ri 209 | . 2 ⊢ (∀𝑥(𝑥 ∈ 𝐴 ↔ (𝑥 ∈ 𝐴 ∧ ∃𝑦𝜑)) ↔ dom {〈𝑥, 𝑦〉 ∣ (𝑥 ∈ 𝐴 ∧ 𝜑)} = 𝐴) |
| 12 | 1, 3, 11 | 3bitri 206 | 1 ⊢ (∀𝑥 ∈ 𝐴 ∃𝑦𝜑 ↔ dom {〈𝑥, 𝑦〉 ∣ (𝑥 ∈ 𝐴 ∧ 𝜑)} = 𝐴) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 ∧ wa 104 ↔ wb 105 ∀wal 1393 = wceq 1395 ∃wex 1538 ∈ wcel 2200 {cab 2215 ∀wral 2508 {copab 4143 dom cdm 4716 |
| 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-14 2203 ax-ext 2211 ax-sep 4201 ax-pow 4257 ax-pr 4292 |
| This theorem depends on definitions: df-bi 117 df-3an 1004 df-tru 1398 df-nf 1507 df-sb 1809 df-eu 2080 df-mo 2081 df-clab 2216 df-cleq 2222 df-clel 2225 df-nfc 2361 df-ral 2513 df-v 2801 df-un 3201 df-in 3203 df-ss 3210 df-pw 3651 df-sn 3672 df-pr 3673 df-op 3675 df-br 4083 df-opab 4145 df-dm 4726 |
| This theorem is referenced by: dmxpm 4940 dmxpid 4941 fnopabg 5443 acfun 7377 ccfunen 7438 |
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