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Theorem refrelcosslem 38441
Description: Lemma for the left side of the refrelcoss3 38442 reflexivity theorem. (Contributed by Peter Mazsa, 1-Apr-2019.)
Assertion
Ref Expression
refrelcosslem 𝑥 ∈ dom ≀ 𝑅𝑥𝑅𝑥

Proof of Theorem refrelcosslem
StepHypRef Expression
1 ralel 3047 . 2 𝑥 ∈ dom ≀ 𝑅𝑥 ∈ dom ≀ 𝑅
2 eldmcoss2 38438 . . . 4 (𝑥 ∈ V → (𝑥 ∈ dom ≀ 𝑅𝑥𝑅𝑥))
32elv 3443 . . 3 (𝑥 ∈ dom ≀ 𝑅𝑥𝑅𝑥)
43ralbii 3075 . 2 (∀𝑥 ∈ dom ≀ 𝑅𝑥 ∈ dom ≀ 𝑅 ↔ ∀𝑥 ∈ dom ≀ 𝑅𝑥𝑅𝑥)
51, 4mpbi 230 1 𝑥 ∈ dom ≀ 𝑅𝑥𝑅𝑥
Colors of variables: wff setvar class
Syntax hints:  wb 206  wcel 2109  wral 3044  Vcvv 3438   class class class wbr 5095  dom cdm 5623  ccoss 38157
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1795  ax-4 1809  ax-5 1910  ax-6 1967  ax-7 2008  ax-8 2111  ax-9 2119  ax-ext 2701  ax-sep 5238  ax-nul 5248  ax-pr 5374
This theorem depends on definitions:  df-bi 207  df-an 396  df-or 848  df-3an 1088  df-tru 1543  df-fal 1553  df-ex 1780  df-sb 2066  df-clab 2708  df-cleq 2721  df-clel 2803  df-ral 3045  df-rab 3397  df-v 3440  df-dif 3908  df-un 3910  df-ss 3922  df-nul 4287  df-if 4479  df-sn 4580  df-pr 4582  df-op 4586  df-br 5096  df-opab 5158  df-cnv 5631  df-co 5632  df-dm 5633  df-rn 5634  df-coss 38390
This theorem is referenced by:  refrelcoss3  38442  eqvrelcoss3  38597
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