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Theorem dmqscoelseq 36510
Description: Two ways to express the equality of the domain quotient of the coelements on the class 𝐴 with the class 𝐴. (Contributed by Peter Mazsa, 26-Sep-2021.)
Assertion
Ref Expression
dmqscoelseq ((dom ∼ 𝐴 /𝐴) = 𝐴 ↔ ( 𝐴 /𝐴) = 𝐴)

Proof of Theorem dmqscoelseq
StepHypRef Expression
1 dmcoels 36312 . . 3 dom ∼ 𝐴 = 𝐴
21qseq1i 36161 . 2 (dom ∼ 𝐴 /𝐴) = ( 𝐴 /𝐴)
32eqeq1i 2742 1 ((dom ∼ 𝐴 /𝐴) = 𝐴 ↔ ( 𝐴 /𝐴) = 𝐴)
Colors of variables: wff setvar class
Syntax hints:  wb 209   = wceq 1543   cuni 4819  dom cdm 5551   / cqs 8390  ccoels 36071
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1803  ax-4 1817  ax-5 1918  ax-6 1976  ax-7 2016  ax-8 2112  ax-9 2120  ax-10 2141  ax-11 2158  ax-12 2175  ax-ext 2708  ax-sep 5192  ax-nul 5199  ax-pr 5322
This theorem depends on definitions:  df-bi 210  df-an 400  df-or 848  df-3an 1091  df-tru 1546  df-fal 1556  df-ex 1788  df-nf 1792  df-sb 2071  df-mo 2539  df-eu 2568  df-clab 2715  df-cleq 2729  df-clel 2816  df-nfc 2886  df-ne 2941  df-ral 3066  df-rex 3067  df-rab 3070  df-v 3410  df-dif 3869  df-un 3871  df-in 3873  df-ss 3883  df-nul 4238  df-if 4440  df-sn 4542  df-pr 4544  df-op 4548  df-uni 4820  df-br 5054  df-opab 5116  df-eprel 5460  df-xp 5557  df-rel 5558  df-cnv 5559  df-co 5560  df-dm 5561  df-rn 5562  df-res 5563  df-qs 8397  df-coss 36274  df-coels 36275
This theorem is referenced by:  dmqs1cosscnvepreseq  36511  dfmember3  36523
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