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Theorem eltpi 4692
Description: A member of an unordered triple of classes is one of them. (Contributed by Mario Carneiro, 11-Feb-2015.)
Assertion
Ref Expression
eltpi (𝐴 ∈ {𝐵, 𝐶, 𝐷} → (𝐴 = 𝐵𝐴 = 𝐶𝐴 = 𝐷))

Proof of Theorem eltpi
StepHypRef Expression
1 eltpg 4690 . 2 (𝐴 ∈ {𝐵, 𝐶, 𝐷} → (𝐴 ∈ {𝐵, 𝐶, 𝐷} ↔ (𝐴 = 𝐵𝐴 = 𝐶𝐴 = 𝐷)))
21ibi 267 1 (𝐴 ∈ {𝐵, 𝐶, 𝐷} → (𝐴 = 𝐵𝐴 = 𝐶𝐴 = 𝐷))
Colors of variables: wff setvar class
Syntax hints:  wi 4  w3o 1085   = wceq 1536  wcel 2105  {ctp 4634
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1791  ax-4 1805  ax-5 1907  ax-6 1964  ax-7 2004  ax-8 2107  ax-9 2115  ax-ext 2705
This theorem depends on definitions:  df-bi 207  df-an 396  df-or 848  df-3or 1087  df-tru 1539  df-ex 1776  df-sb 2062  df-clab 2712  df-cleq 2726  df-clel 2813  df-v 3479  df-un 3967  df-sn 4631  df-pr 4633  df-tp 4635
This theorem is referenced by:  fvf1tp  13825  tpfo  14535  prm23lt5  16847  perfectlem2  27288  zabsle1  27354  gsumtp  33043  cyc3co2  33142  sgnmulsgn  34530  sgnmulsgp  34531  kur14lem7  35196  omcl3g  43323  fmtnofz04prm  47501  perfectALTVlem2  47646
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