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Theorem eldmres2 36410
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 36408 . 2 (𝐵𝑉 → (𝐵 ∈ dom (𝑅𝐴) ↔ (𝐵𝐴 ∧ ∃𝑦 𝐵𝑅𝑦)))
2 eldmg 5807 . . . 4 (𝐵𝑉 → (𝐵 ∈ dom 𝑅 ↔ ∃𝑦 𝐵𝑅𝑦))
3 eldm4 36409 . . . 4 (𝐵𝑉 → (𝐵 ∈ dom 𝑅 ↔ ∃𝑦 𝑦 ∈ [𝐵]𝑅))
42, 3bitr3d 280 . . 3 (𝐵𝑉 → (∃𝑦 𝐵𝑅𝑦 ↔ ∃𝑦 𝑦 ∈ [𝐵]𝑅))
54anbi2d 629 . 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 396  wex 1782  wcel 2106   class class class wbr 5074  dom cdm 5589  cres 5591  [cec 8496
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1798  ax-4 1812  ax-5 1913  ax-6 1971  ax-7 2011  ax-8 2108  ax-9 2116  ax-ext 2709  ax-sep 5223  ax-nul 5230  ax-pr 5352
This theorem depends on definitions:  df-bi 206  df-an 397  df-or 845  df-3an 1088  df-tru 1542  df-fal 1552  df-ex 1783  df-sb 2068  df-clab 2716  df-cleq 2730  df-clel 2816  df-ral 3069  df-rex 3070  df-rab 3073  df-v 3434  df-dif 3890  df-un 3892  df-in 3894  df-nul 4257  df-if 4460  df-sn 4562  df-pr 4564  df-op 4568  df-br 5075  df-opab 5137  df-xp 5595  df-cnv 5597  df-dm 5599  df-rn 5600  df-res 5601  df-ima 5602  df-ec 8500
This theorem is referenced by:  eldmqsres  36421
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