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Theorem eldmres2 36337
Description: Elementhood in the domain of a restriction. (Contributed by Peter Mazsa, 21-Aug-2020.)
Assertion
Ref Expression
eldmres2 (𝐵𝑉 → (𝐵 ∈ dom (𝑅𝐴) ↔ (𝐵𝐴 ∧ ∃𝑦 𝑦 ∈ [𝐵]𝑅)))
Distinct variable groups:   𝑦,𝐴   𝑦,𝐵   𝑦,𝑅   𝑦,𝑉

Proof of Theorem eldmres2
StepHypRef Expression
1 eldmres 36335 . 2 (𝐵𝑉 → (𝐵 ∈ dom (𝑅𝐴) ↔ (𝐵𝐴 ∧ ∃𝑦 𝐵𝑅𝑦)))
2 eldmg 5796 . . . 4 (𝐵𝑉 → (𝐵 ∈ dom 𝑅 ↔ ∃𝑦 𝐵𝑅𝑦))
3 eldm4 36336 . . . 4 (𝐵𝑉 → (𝐵 ∈ dom 𝑅 ↔ ∃𝑦 𝑦 ∈ [𝐵]𝑅))
42, 3bitr3d 280 . . 3 (𝐵𝑉 → (∃𝑦 𝐵𝑅𝑦 ↔ ∃𝑦 𝑦 ∈ [𝐵]𝑅))
54anbi2d 628 . 2 (𝐵𝑉 → ((𝐵𝐴 ∧ ∃𝑦 𝐵𝑅𝑦) ↔ (𝐵𝐴 ∧ ∃𝑦 𝑦 ∈ [𝐵]𝑅)))
61, 5bitrd 278 1 (𝐵𝑉 → (𝐵 ∈ dom (𝑅𝐴) ↔ (𝐵𝐴 ∧ ∃𝑦 𝑦 ∈ [𝐵]𝑅)))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 205  wa 395  wex 1783  wcel 2108   class class class wbr 5070  dom cdm 5580  cres 5582  [cec 8454
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1799  ax-4 1813  ax-5 1914  ax-6 1972  ax-7 2012  ax-8 2110  ax-9 2118  ax-ext 2709  ax-sep 5218  ax-nul 5225  ax-pr 5347
This theorem depends on definitions:  df-bi 206  df-an 396  df-or 844  df-3an 1087  df-tru 1542  df-fal 1552  df-ex 1784  df-sb 2069  df-clab 2716  df-cleq 2730  df-clel 2817  df-ral 3068  df-rex 3069  df-rab 3072  df-v 3424  df-dif 3886  df-un 3888  df-in 3890  df-nul 4254  df-if 4457  df-sn 4559  df-pr 4561  df-op 4565  df-br 5071  df-opab 5133  df-xp 5586  df-cnv 5588  df-dm 5590  df-rn 5591  df-res 5592  df-ima 5593  df-ec 8458
This theorem is referenced by:  eldmqsres  36348
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