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Theorem elunnel1 4148
Description: A member of a union that is not a member of the first class, is a member of the second class. (Contributed by Glauco Siliprandi, 11-Dec-2019.)
Assertion
Ref Expression
elunnel1 ((𝐴 ∈ (𝐵𝐶) ∧ ¬ 𝐴𝐵) → 𝐴𝐶)

Proof of Theorem elunnel1
StepHypRef Expression
1 elun 4147 . . 3 (𝐴 ∈ (𝐵𝐶) ↔ (𝐴𝐵𝐴𝐶))
21biimpi 215 . 2 (𝐴 ∈ (𝐵𝐶) → (𝐴𝐵𝐴𝐶))
32orcanai 1001 1 ((𝐴 ∈ (𝐵𝐶) ∧ ¬ 𝐴𝐵) → 𝐴𝐶)
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wi 4  wa 396  wo 845  wcel 2106  cun 3945
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1797  ax-4 1811  ax-5 1913  ax-6 1971  ax-7 2011  ax-8 2108  ax-9 2116  ax-ext 2703
This theorem depends on definitions:  df-bi 206  df-an 397  df-or 846  df-tru 1544  df-ex 1782  df-sb 2068  df-clab 2710  df-cleq 2724  df-clel 2810  df-v 3476  df-un 3952
This theorem is referenced by:  fsumsplitsn  15686  fprodsplitsn  15929  founiiun0  43873  infxrpnf  44142  cnrefiisplem  44531  dvnprodlem1  44648  fourierdlem70  44878  fourierdlem71  44879  fourierdlem80  44888  sge0splitmpt  45113  sge0iunmptlemfi  45115  nnfoctbdjlem  45157  hoidmvlelem2  45298  hoidmvlelem3  45299  pimrecltpos  45410
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