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Theorem refrelcosslem 39404
Description: Lemma for the left side of the refrelcoss3 39405 reflexivity theorem. (Contributed by Peter Mazsa, 1-Apr-2019.)
Assertion
Ref Expression
refrelcosslem ∀𝑥 ∈ dom ≀ 𝑅𝑥 ≀ 𝑅𝑥

Proof of Theorem refrelcosslem
StepHypRef Expression
1 ralel 3079 . 2 ∀𝑥 ∈ dom ≀ 𝑅𝑥 ∈ dom ≀ 𝑅
2 eldmcoss2 39401 . . . 4 (𝑥 ∈ V → (𝑥 ∈ dom ≀ 𝑅 ↔ 𝑥 ≀ 𝑅𝑥))
32elv 3455 . . 3 (𝑥 ∈ dom ≀ 𝑅 ↔ 𝑥 ≀ 𝑅𝑥)
43ralbii 3108 . 2 (∀𝑥 ∈ dom ≀ 𝑅𝑥 ∈ dom ≀ 𝑅 ↔ ∀𝑥 ∈ dom ≀ 𝑅𝑥 ≀ 𝑅𝑥)
51, 4mpbi 233 1 ∀𝑥 ∈ dom ≀ 𝑅𝑥 ≀ 𝑅𝑥
Colors of variables:    wff setvar class
This proof depends on syntax axioms:   ↔ wb 209   ∈ wcel 2145  ∀wral 3076  Vcvv 3450   class class class wbr 5102  dom cdm 5647   ≀ ccoss 39035
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1828  ax-4 1842  ax-5 1943  ax-6 2000  ax-7 2041  ax-8 2147  ax-9 2155  ax-ext 2732  ax-sep 5248  ax-pr 5390
This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1813  df-sb 2100  df-clab 2739  df-cleq 2752  df-clel 2835  df-ral 3077  df-rab 3413  df-v 3452  df-dif 3901  df-un 3903  df-in 3905  df-ss 3915  df-nul 4279  df-if 4482  df-sn 4584  df-pr 4586  df-op 4590  df-br 5103  df-opab 5167  df-cnv 5655  df-co 5656  df-dm 5657  df-rn 5658  df-coss 39353
This theorem is used by:  refrelcoss3  39405  eqvrelcoss3  39554
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