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Theorem refrelcosslem 35704
Description: Lemma for the left side of the refrelcoss3 35705 reflexivity theorem. (Contributed by Peter Mazsa, 1-Apr-2019.)
Assertion
Ref Expression
refrelcosslem 𝑥 ∈ dom ≀ 𝑅𝑥𝑅𝑥

Proof of Theorem refrelcosslem
StepHypRef Expression
1 ralel 3151 . 2 𝑥 ∈ dom ≀ 𝑅𝑥 ∈ dom ≀ 𝑅
2 eldmcoss2 35701 . . . 4 (𝑥 ∈ V → (𝑥 ∈ dom ≀ 𝑅𝑥𝑅𝑥))
32elv 3501 . . 3 (𝑥 ∈ dom ≀ 𝑅𝑥𝑅𝑥)
43ralbii 3167 . 2 (∀𝑥 ∈ dom ≀ 𝑅𝑥 ∈ dom ≀ 𝑅 ↔ ∀𝑥 ∈ dom ≀ 𝑅𝑥𝑅𝑥)
51, 4mpbi 232 1 𝑥 ∈ dom ≀ 𝑅𝑥𝑅𝑥
Colors of variables: wff setvar class
Syntax hints:  wb 208  wcel 2114  wral 3140  Vcvv 3496   class class class wbr 5068  dom cdm 5557  ccoss 35455
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1796  ax-4 1810  ax-5 1911  ax-6 1970  ax-7 2015  ax-8 2116  ax-9 2124  ax-10 2145  ax-11 2161  ax-12 2177  ax-ext 2795  ax-sep 5205  ax-nul 5212  ax-pr 5332
This theorem depends on definitions:  df-bi 209  df-an 399  df-or 844  df-3an 1085  df-tru 1540  df-ex 1781  df-nf 1785  df-sb 2070  df-mo 2622  df-eu 2654  df-clab 2802  df-cleq 2816  df-clel 2895  df-nfc 2965  df-ral 3145  df-rab 3149  df-v 3498  df-dif 3941  df-un 3943  df-in 3945  df-ss 3954  df-nul 4294  df-if 4470  df-sn 4570  df-pr 4572  df-op 4576  df-br 5069  df-opab 5131  df-cnv 5565  df-co 5566  df-dm 5567  df-rn 5568  df-coss 35661
This theorem is referenced by:  refrelcoss3  35705  eqvrelcoss3  35855
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