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Theorem epinid0 9638
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.)
Assertion
Ref Expression
epinid0 ( E ∩ I ) = ∅

Proof of Theorem epinid0
Dummy variables 𝑥 𝑦 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 df-eprel 5589 . . 3 E = {⟨𝑥, 𝑦⟩ ∣ 𝑥𝑦}
2 df-id 5583 . . 3 I = {⟨𝑥, 𝑦⟩ ∣ 𝑥 = 𝑦}
31, 2ineq12i 4226 . 2 ( E ∩ I ) = ({⟨𝑥, 𝑦⟩ ∣ 𝑥𝑦} ∩ {⟨𝑥, 𝑦⟩ ∣ 𝑥 = 𝑦})
4 inopab 5842 . 2 ({⟨𝑥, 𝑦⟩ ∣ 𝑥𝑦} ∩ {⟨𝑥, 𝑦⟩ ∣ 𝑥 = 𝑦}) = {⟨𝑥, 𝑦⟩ ∣ (𝑥𝑦𝑥 = 𝑦)}
5 nelaneq 9637 . . . 4 ¬ (𝑥𝑦𝑥 = 𝑦)
65gen2 1793 . . 3 𝑥𝑦 ¬ (𝑥𝑦𝑥 = 𝑦)
7 opab0 5564 . . 3 ({⟨𝑥, 𝑦⟩ ∣ (𝑥𝑦𝑥 = 𝑦)} = ∅ ↔ ∀𝑥𝑦 ¬ (𝑥𝑦𝑥 = 𝑦))
86, 7mpbir 231 . 2 {⟨𝑥, 𝑦⟩ ∣ (𝑥𝑦𝑥 = 𝑦)} = ∅
93, 4, 83eqtri 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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