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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 9047. (Proposed by BJ, 18-Jun-2022.) (Contributed by AV, 18-Jun-2022.) |
Ref | Expression |
---|---|
epinid0 | ⊢ ( E ∩ I ) = ∅ |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-eprel 5430 | . . 3 ⊢ E = {〈𝑥, 𝑦〉 ∣ 𝑥 ∈ 𝑦} | |
2 | df-id 5425 | . . 3 ⊢ I = {〈𝑥, 𝑦〉 ∣ 𝑥 = 𝑦} | |
3 | 1, 2 | ineq12i 4137 | . 2 ⊢ ( E ∩ I ) = ({〈𝑥, 𝑦〉 ∣ 𝑥 ∈ 𝑦} ∩ {〈𝑥, 𝑦〉 ∣ 𝑥 = 𝑦}) |
4 | inopab 5665 | . 2 ⊢ ({〈𝑥, 𝑦〉 ∣ 𝑥 ∈ 𝑦} ∩ {〈𝑥, 𝑦〉 ∣ 𝑥 = 𝑦}) = {〈𝑥, 𝑦〉 ∣ (𝑥 ∈ 𝑦 ∧ 𝑥 = 𝑦)} | |
5 | nelaneq 9047 | . . . 4 ⊢ ¬ (𝑥 ∈ 𝑦 ∧ 𝑥 = 𝑦) | |
6 | 5 | gen2 1798 | . . 3 ⊢ ∀𝑥∀𝑦 ¬ (𝑥 ∈ 𝑦 ∧ 𝑥 = 𝑦) |
7 | opab0 5406 | . . 3 ⊢ ({〈𝑥, 𝑦〉 ∣ (𝑥 ∈ 𝑦 ∧ 𝑥 = 𝑦)} = ∅ ↔ ∀𝑥∀𝑦 ¬ (𝑥 ∈ 𝑦 ∧ 𝑥 = 𝑦)) | |
8 | 6, 7 | mpbir 234 | . 2 ⊢ {〈𝑥, 𝑦〉 ∣ (𝑥 ∈ 𝑦 ∧ 𝑥 = 𝑦)} = ∅ |
9 | 3, 4, 8 | 3eqtri 2825 | 1 ⊢ ( E ∩ I ) = ∅ |
Colors of variables: wff setvar class |
Syntax hints: ¬ wn 3 ∧ wa 399 ∀wal 1536 = wceq 1538 ∩ cin 3880 ∅c0 4243 {copab 5092 I cid 5424 E cep 5429 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1911 ax-6 1970 ax-7 2015 ax-8 2113 ax-9 2121 ax-10 2142 ax-11 2158 ax-12 2175 ax-ext 2770 ax-sep 5167 ax-nul 5174 ax-pr 5295 ax-reg 9040 |
This theorem depends on definitions: df-bi 210 df-an 400 df-or 845 df-3an 1086 df-tru 1541 df-ex 1782 df-nf 1786 df-sb 2070 df-clab 2777 df-cleq 2791 df-clel 2870 df-nfc 2938 df-ne 2988 df-ral 3111 df-rex 3112 df-rab 3115 df-v 3443 df-dif 3884 df-un 3886 df-in 3888 df-ss 3898 df-nul 4244 df-if 4426 df-sn 4526 df-pr 4528 df-op 4532 df-opab 5093 df-id 5425 df-eprel 5430 df-xp 5525 df-rel 5526 |
This theorem is referenced by: (None) |
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