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Theorem ertr4d 8297
Description: A transitivity relation for equivalences. (Contributed by Mario Carneiro, 9-Jul-2014.)
Hypotheses
Ref Expression
ersymb.1 (𝜑𝑅 Er 𝑋)
ertr4d.5 (𝜑𝐴𝑅𝐵)
ertr4d.6 (𝜑𝐶𝑅𝐵)
Assertion
Ref Expression
ertr4d (𝜑𝐴𝑅𝐶)

Proof of Theorem ertr4d
StepHypRef Expression
1 ersymb.1 . 2 (𝜑𝑅 Er 𝑋)
2 ertr4d.5 . 2 (𝜑𝐴𝑅𝐵)
3 ertr4d.6 . . 3 (𝜑𝐶𝑅𝐵)
41, 3ersym 8290 . 2 (𝜑𝐵𝑅𝐶)
51, 2, 4ertrd 8294 1 (𝜑𝐴𝑅𝐶)
Colors of variables: wff setvar class
Syntax hints:  wi 4   class class class wbr 5057   Er wer 8275
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1787  ax-4 1801  ax-5 1902  ax-6 1961  ax-7 2006  ax-8 2107  ax-9 2115  ax-10 2136  ax-11 2151  ax-12 2167  ax-ext 2790  ax-sep 5194  ax-nul 5201  ax-pr 5320
This theorem depends on definitions:  df-bi 208  df-an 397  df-or 842  df-3an 1081  df-tru 1531  df-ex 1772  df-nf 1776  df-sb 2061  df-mo 2615  df-eu 2647  df-clab 2797  df-cleq 2811  df-clel 2890  df-nfc 2960  df-ral 3140  df-rex 3141  df-rab 3144  df-v 3494  df-dif 3936  df-un 3938  df-in 3940  df-ss 3949  df-nul 4289  df-if 4464  df-sn 4558  df-pr 4560  df-op 4564  df-br 5058  df-opab 5120  df-xp 5554  df-rel 5555  df-cnv 5556  df-co 5557  df-er 8278
This theorem is referenced by:  erref  8298  erdisj  8330  nqereu  10339  nqereq  10345  efgredeu  18807  pi1xfr  23586  pi1xfrcnvlem  23587
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