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Theorem psseq1d 3983
Description: An equality deduction for the proper subclass relationship. (Contributed by NM, 9-Jun-2004.)
Hypothesis
Ref Expression
psseq1d.1 (𝜑𝐴 = 𝐵)
Assertion
Ref Expression
psseq1d (𝜑 → (𝐴𝐶𝐵𝐶))

Proof of Theorem psseq1d
StepHypRef Expression
1 psseq1d.1 . 2 (𝜑𝐴 = 𝐵)
2 psseq1 3978 . 2 (𝐴 = 𝐵 → (𝐴𝐶𝐵𝐶))
31, 2syl 17 1 (𝜑 → (𝐴𝐶𝐵𝐶))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 209   = wceq 1542  wpss 3844
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1802  ax-4 1816  ax-5 1917  ax-6 1975  ax-7 2020  ax-8 2116  ax-9 2124  ax-ext 2710
This theorem depends on definitions:  df-bi 210  df-an 400  df-tru 1545  df-ex 1787  df-sb 2075  df-clab 2717  df-cleq 2730  df-clel 2811  df-ne 2935  df-v 3400  df-in 3850  df-ss 3860  df-pss 3862
This theorem is referenced by:  psseq12d  3985  fin23lem32  9846  fin23lem35  9849  compssiso  9876  mrieqv2d  17015  mrissmrcd  17016  pgpfac1lem5  19322  islbs3  20048  chpsscon2  29442
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