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Mirrors > Home > MPE Home > Th. List > elopabr | Structured version Visualization version GIF version |
Description: Membership in a class abstraction of pairs, defined by a binary relation. (Contributed by AV, 16-Feb-2021.) |
Ref | Expression |
---|---|
elopabr | ⊢ (𝐴 ∈ {〈𝑥, 𝑦〉 ∣ 𝑥𝑅𝑦} → 𝐴 ∈ 𝑅) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | elopab 4908 | . 2 ⊢ (𝐴 ∈ {〈𝑥, 𝑦〉 ∣ 𝑥𝑅𝑦} ↔ ∃𝑥∃𝑦(𝐴 = 〈𝑥, 𝑦〉 ∧ 𝑥𝑅𝑦)) | |
2 | df-br 4584 | . . . . . 6 ⊢ (𝑥𝑅𝑦 ↔ 〈𝑥, 𝑦〉 ∈ 𝑅) | |
3 | 2 | biimpi 205 | . . . . 5 ⊢ (𝑥𝑅𝑦 → 〈𝑥, 𝑦〉 ∈ 𝑅) |
4 | eleq1 2676 | . . . . 5 ⊢ (𝐴 = 〈𝑥, 𝑦〉 → (𝐴 ∈ 𝑅 ↔ 〈𝑥, 𝑦〉 ∈ 𝑅)) | |
5 | 3, 4 | syl5ibr 235 | . . . 4 ⊢ (𝐴 = 〈𝑥, 𝑦〉 → (𝑥𝑅𝑦 → 𝐴 ∈ 𝑅)) |
6 | 5 | imp 444 | . . 3 ⊢ ((𝐴 = 〈𝑥, 𝑦〉 ∧ 𝑥𝑅𝑦) → 𝐴 ∈ 𝑅) |
7 | 6 | exlimivv 1847 | . 2 ⊢ (∃𝑥∃𝑦(𝐴 = 〈𝑥, 𝑦〉 ∧ 𝑥𝑅𝑦) → 𝐴 ∈ 𝑅) |
8 | 1, 7 | sylbi 206 | 1 ⊢ (𝐴 ∈ {〈𝑥, 𝑦〉 ∣ 𝑥𝑅𝑦} → 𝐴 ∈ 𝑅) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∧ wa 383 = wceq 1475 ∃wex 1695 ∈ wcel 1977 〈cop 4131 class class class wbr 4583 {copab 4642 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1713 ax-4 1728 ax-5 1827 ax-6 1875 ax-7 1922 ax-9 1986 ax-10 2006 ax-11 2021 ax-12 2034 ax-13 2234 ax-ext 2590 ax-sep 4709 ax-nul 4717 ax-pr 4833 |
This theorem depends on definitions: df-bi 196 df-or 384 df-an 385 df-3an 1033 df-tru 1478 df-ex 1696 df-nf 1701 df-sb 1868 df-clab 2597 df-cleq 2603 df-clel 2606 df-nfc 2740 df-v 3175 df-dif 3543 df-un 3545 df-in 3547 df-ss 3554 df-nul 3875 df-if 4037 df-sn 4126 df-pr 4128 df-op 4132 df-br 4584 df-opab 4644 |
This theorem is referenced by: elopabran 4938 |
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