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Mirrors > Home > MPE Home > Th. List > dmopab | Structured version Visualization version GIF version |
Description: The domain of a class of ordered pairs. (Contributed by NM, 16-May-1995.) (Revised by Mario Carneiro, 4-Dec-2016.) |
Ref | Expression |
---|---|
dmopab | ⊢ dom {〈𝑥, 𝑦〉 ∣ 𝜑} = {𝑥 ∣ ∃𝑦𝜑} |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | nfopab1 5145 | . . 3 ⊢ Ⅎ𝑥{〈𝑥, 𝑦〉 ∣ 𝜑} | |
2 | nfopab2 5146 | . . 3 ⊢ Ⅎ𝑦{〈𝑥, 𝑦〉 ∣ 𝜑} | |
3 | 1, 2 | dfdmf 5799 | . 2 ⊢ dom {〈𝑥, 𝑦〉 ∣ 𝜑} = {𝑥 ∣ ∃𝑦 𝑥{〈𝑥, 𝑦〉 ∣ 𝜑}𝑦} |
4 | df-br 5076 | . . . . 5 ⊢ (𝑥{〈𝑥, 𝑦〉 ∣ 𝜑}𝑦 ↔ 〈𝑥, 𝑦〉 ∈ {〈𝑥, 𝑦〉 ∣ 𝜑}) | |
5 | opabidw 5436 | . . . . 5 ⊢ (〈𝑥, 𝑦〉 ∈ {〈𝑥, 𝑦〉 ∣ 𝜑} ↔ 𝜑) | |
6 | 4, 5 | bitri 274 | . . . 4 ⊢ (𝑥{〈𝑥, 𝑦〉 ∣ 𝜑}𝑦 ↔ 𝜑) |
7 | 6 | exbii 1851 | . . 3 ⊢ (∃𝑦 𝑥{〈𝑥, 𝑦〉 ∣ 𝜑}𝑦 ↔ ∃𝑦𝜑) |
8 | 7 | abbii 2807 | . 2 ⊢ {𝑥 ∣ ∃𝑦 𝑥{〈𝑥, 𝑦〉 ∣ 𝜑}𝑦} = {𝑥 ∣ ∃𝑦𝜑} |
9 | 3, 8 | eqtri 2765 | 1 ⊢ dom {〈𝑥, 𝑦〉 ∣ 𝜑} = {𝑥 ∣ ∃𝑦𝜑} |
Colors of variables: wff setvar class |
Syntax hints: = wceq 1539 ∃wex 1783 ∈ wcel 2107 {cab 2714 〈cop 4569 class class class wbr 5075 {copab 5137 dom cdm 5585 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1799 ax-4 1813 ax-5 1914 ax-6 1972 ax-7 2012 ax-8 2109 ax-9 2117 ax-10 2138 ax-11 2155 ax-12 2172 ax-ext 2708 ax-sep 5223 ax-nul 5230 ax-pr 5352 |
This theorem depends on definitions: df-bi 206 df-an 396 df-or 844 df-3an 1087 df-tru 1542 df-fal 1552 df-ex 1784 df-nf 1788 df-sb 2069 df-mo 2539 df-eu 2568 df-clab 2715 df-cleq 2729 df-clel 2815 df-nfc 2887 df-rab 3071 df-v 3429 df-dif 3891 df-un 3893 df-nul 4259 df-if 4462 df-sn 4564 df-pr 4566 df-op 4570 df-br 5076 df-opab 5138 df-dm 5595 |
This theorem is referenced by: dmopabelb 5819 dmopabss 5821 dmopab3 5822 mptfnf 6557 opabiotadm 6837 fndmin 6909 dmoprab 7359 zfrep6 7776 hartogslem1 9247 rankf 9499 dfac3 9824 axdc2lem 10151 shftdm 14726 dfiso2 17428 adjeu 30192 satfdm 33273 fmla0 33286 fmlasuc0 33288 dmttrcl 33749 |
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