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Theorem ertr2d 8742
Description: A transitivity relation for equivalences. (Contributed by Mario Carneiro, 9-Jul-2014.)
Hypotheses
Ref Expression
ersymb.1 (𝜑𝑅 Er 𝑋)
ertrd.5 (𝜑𝐴𝑅𝐵)
ertrd.6 (𝜑𝐵𝑅𝐶)
Assertion
Ref Expression
ertr2d (𝜑𝐶𝑅𝐴)

Proof of Theorem ertr2d
StepHypRef Expression
1 ersymb.1 . 2 (𝜑𝑅 Er 𝑋)
2 ertrd.5 . . 3 (𝜑𝐴𝑅𝐵)
3 ertrd.6 . . 3 (𝜑𝐵𝑅𝐶)
41, 2, 3ertrd 8741 . 2 (𝜑𝐴𝑅𝐶)
51, 4ersym 8737 1 (𝜑𝐶𝑅𝐴)
Colors of variables: wff setvar class
Syntax hints:  wi 4   class class class wbr 5148   Er wer 8722
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1790  ax-4 1804  ax-5 1906  ax-6 1964  ax-7 2004  ax-8 2101  ax-9 2109  ax-ext 2699  ax-sep 5299  ax-nul 5306  ax-pr 5429
This theorem depends on definitions:  df-bi 206  df-an 396  df-or 847  df-3an 1087  df-tru 1537  df-fal 1547  df-ex 1775  df-sb 2061  df-clab 2706  df-cleq 2720  df-clel 2806  df-ral 3059  df-rex 3068  df-rab 3430  df-v 3473  df-dif 3950  df-un 3952  df-in 3954  df-ss 3964  df-nul 4324  df-if 4530  df-sn 4630  df-pr 4632  df-op 4636  df-br 5149  df-opab 5211  df-xp 5684  df-rel 5685  df-cnv 5686  df-co 5687  df-er 8725
This theorem is referenced by:  pi1xfrcnvlem  24996
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