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Mirrors > Home > MPE Home > Th. List > epinid0 | Structured version Visualization version GIF version |
Description: The membership relation and the identity relation are disjoint. Variable-free version of nelaneq 9637. (Proposed by BJ, 18-Jun-2022.) (Contributed by AV, 18-Jun-2022.) |
Ref | Expression |
---|---|
epinid0 | ⊢ ( E ∩ I ) = ∅ |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-eprel 5589 | . . 3 ⊢ E = {〈𝑥, 𝑦〉 ∣ 𝑥 ∈ 𝑦} | |
2 | df-id 5583 | . . 3 ⊢ I = {〈𝑥, 𝑦〉 ∣ 𝑥 = 𝑦} | |
3 | 1, 2 | ineq12i 4226 | . 2 ⊢ ( E ∩ I ) = ({〈𝑥, 𝑦〉 ∣ 𝑥 ∈ 𝑦} ∩ {〈𝑥, 𝑦〉 ∣ 𝑥 = 𝑦}) |
4 | inopab 5842 | . 2 ⊢ ({〈𝑥, 𝑦〉 ∣ 𝑥 ∈ 𝑦} ∩ {〈𝑥, 𝑦〉 ∣ 𝑥 = 𝑦}) = {〈𝑥, 𝑦〉 ∣ (𝑥 ∈ 𝑦 ∧ 𝑥 = 𝑦)} | |
5 | nelaneq 9637 | . . . 4 ⊢ ¬ (𝑥 ∈ 𝑦 ∧ 𝑥 = 𝑦) | |
6 | 5 | gen2 1793 | . . 3 ⊢ ∀𝑥∀𝑦 ¬ (𝑥 ∈ 𝑦 ∧ 𝑥 = 𝑦) |
7 | opab0 5564 | . . 3 ⊢ ({〈𝑥, 𝑦〉 ∣ (𝑥 ∈ 𝑦 ∧ 𝑥 = 𝑦)} = ∅ ↔ ∀𝑥∀𝑦 ¬ (𝑥 ∈ 𝑦 ∧ 𝑥 = 𝑦)) | |
8 | 6, 7 | mpbir 231 | . 2 ⊢ {〈𝑥, 𝑦〉 ∣ (𝑥 ∈ 𝑦 ∧ 𝑥 = 𝑦)} = ∅ |
9 | 3, 4, 8 | 3eqtri 2767 | 1 ⊢ ( E ∩ I ) = ∅ |
Colors of variables: wff setvar class |
Syntax hints: ¬ wn 3 ∧ wa 395 ∀wal 1535 = wceq 1537 ∩ cin 3962 ∅c0 4339 {copab 5210 I cid 5582 E cep 5588 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1792 ax-4 1806 ax-5 1908 ax-6 1965 ax-7 2005 ax-8 2108 ax-9 2116 ax-10 2139 ax-11 2155 ax-12 2175 ax-ext 2706 ax-sep 5302 ax-nul 5312 ax-pr 5438 ax-reg 9630 |
This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3an 1088 df-tru 1540 df-fal 1550 df-ex 1777 df-nf 1781 df-sb 2063 df-clab 2713 df-cleq 2727 df-clel 2814 df-ne 2939 df-ral 3060 df-rex 3069 df-rab 3434 df-v 3480 df-dif 3966 df-un 3968 df-in 3970 df-ss 3980 df-nul 4340 df-if 4532 df-sn 4632 df-pr 4634 df-op 4638 df-opab 5211 df-id 5583 df-eprel 5589 df-xp 5695 df-rel 5696 |
This theorem is referenced by: (None) |
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