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Theorem qseq12 8530
Description: Equality theorem for quotient set. (Contributed by Peter Mazsa, 17-Apr-2019.)
Assertion
Ref Expression
qseq12 ((𝐴 = 𝐵𝐶 = 𝐷) → (𝐴 / 𝐶) = (𝐵 / 𝐷))

Proof of Theorem qseq12
StepHypRef Expression
1 qseq1 8526 . 2 (𝐴 = 𝐵 → (𝐴 / 𝐶) = (𝐵 / 𝐶))
2 qseq2 8527 . 2 (𝐶 = 𝐷 → (𝐵 / 𝐶) = (𝐵 / 𝐷))
31, 2sylan9eq 2799 1 ((𝐴 = 𝐵𝐶 = 𝐷) → (𝐴 / 𝐶) = (𝐵 / 𝐷))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wa 395   = wceq 1541   / cqs 8471
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1801  ax-4 1815  ax-5 1916  ax-6 1974  ax-7 2014  ax-8 2111  ax-9 2119  ax-ext 2710
This theorem depends on definitions:  df-bi 206  df-an 396  df-or 844  df-3an 1087  df-tru 1544  df-fal 1554  df-ex 1786  df-sb 2071  df-clab 2717  df-cleq 2731  df-clel 2817  df-ral 3070  df-rex 3071  df-rab 3074  df-v 3432  df-dif 3894  df-un 3896  df-in 3898  df-ss 3908  df-nul 4262  df-if 4465  df-sn 4567  df-pr 4569  df-op 4573  df-br 5079  df-opab 5141  df-cnv 5596  df-dm 5598  df-rn 5599  df-res 5600  df-ima 5601  df-ec 8474  df-qs 8478
This theorem is referenced by:  dmqseq  36732  qseq12d  40194
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