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Theorem dmec2d 37678
Description: Equality of the coset of 𝐵 and the coset of 𝐶 implies equivalence of domain elementhood (equivalence is not necessary as opposed to ereldm 8748). (Contributed by Peter Mazsa, 12-Oct-2018.)
Hypothesis
Ref Expression
dmec2d.1 (𝜑 → [𝐵]𝑅 = [𝐶]𝑅)
Assertion
Ref Expression
dmec2d (𝜑 → (𝐵 ∈ dom 𝑅𝐶 ∈ dom 𝑅))

Proof of Theorem dmec2d
StepHypRef Expression
1 eqidd 2725 . 2 (𝜑 → dom 𝑅 = dom 𝑅)
2 dmec2d.1 . 2 (𝜑 → [𝐵]𝑅 = [𝐶]𝑅)
31, 2dmecd 37677 1 (𝜑 → (𝐵 ∈ dom 𝑅𝐶 ∈ dom 𝑅))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 205   = wceq 1533  wcel 2098  dom cdm 5667  [cec 8698
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1789  ax-4 1803  ax-5 1905  ax-6 1963  ax-7 2003  ax-8 2100  ax-9 2108  ax-10 2129  ax-11 2146  ax-12 2163  ax-ext 2695  ax-sep 5290  ax-nul 5297  ax-pr 5418
This theorem depends on definitions:  df-bi 206  df-an 396  df-or 845  df-3an 1086  df-tru 1536  df-fal 1546  df-ex 1774  df-nf 1778  df-sb 2060  df-clab 2702  df-cleq 2716  df-clel 2802  df-ne 2933  df-ral 3054  df-rex 3063  df-rab 3425  df-v 3468  df-dif 3944  df-un 3946  df-in 3948  df-ss 3958  df-nul 4316  df-if 4522  df-sn 4622  df-pr 4624  df-op 4628  df-br 5140  df-opab 5202  df-xp 5673  df-cnv 5675  df-dm 5677  df-rn 5678  df-res 5679  df-ima 5680  df-ec 8702
This theorem is referenced by:  eqvrelth  37985
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