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Theorem extep 38979
Description: Property of epsilon relation, see also extid 39006, extssr 39279 and the comment of df-ssr 39268. (Contributed by Peter Mazsa, 10-Jul-2019.)
Assertion
Ref Expression
extep ((𝐴𝑉𝐵𝑊) → ([𝐴] E = [𝐵] E ↔ 𝐴 = 𝐵))

Proof of Theorem extep
StepHypRef Expression
1 eccnvep 38978 . 2 (𝐴𝑉 → [𝐴] E = 𝐴)
2 eccnvep 38978 . 2 (𝐵𝑊 → [𝐵] E = 𝐵)
31, 2eqeqan12d 2780 1 ((𝐴𝑉𝐵𝑊) → ([𝐴] E = [𝐵] E ↔ 𝐴 = 𝐵))
Colors of variables:    wff setvar class
This proof depends on syntax axioms:  wi 4  wb 209  wa 401   = wceq 1570  wcel 2146   E cep 5565  ccnv 5665  [cec 8701
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1828  ax-4 1842  ax-5 1943  ax-6 2000  ax-7 2041  ax-8 2148  ax-9 2156  ax-ext 2738  ax-sep 5262  ax-pr 5409
This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1813  df-sb 2100  df-clab 2745  df-cleq 2758  df-clel 2841  df-ne 2962  df-ral 3083  df-rex 3093  df-rab 3420  df-v 3460  df-dif 3911  df-un 3913  df-in 3915  df-ss 3925  df-nul 4290  df-if 4493  df-sn 4595  df-pr 4597  df-op 4601  df-br 5115  df-opab 5179  df-eprel 5566  df-xp 5672  df-rel 5673  df-cnv 5674  df-dm 5676  df-rn 5677  df-res 5678  df-ima 5679  df-ec 8705
This theorem is used by: (None)
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