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Theorem eldifn 3332
Description: Implication of membership in a class difference. (Contributed by NM, 3-May-1994.)
Assertion
Ref Expression
eldifn (𝐴 ∈ (𝐵𝐶) → ¬ 𝐴𝐶)

Proof of Theorem eldifn
StepHypRef Expression
1 eldif 3210 . 2 (𝐴 ∈ (𝐵𝐶) ↔ (𝐴𝐵 ∧ ¬ 𝐴𝐶))
21simprbi 275 1 (𝐴 ∈ (𝐵𝐶) → ¬ 𝐴𝐶)
Colors of variables: wff set class
Syntax hints:  ¬ wn 3  wi 4  wcel 2202  cdif 3198
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-in1 619  ax-in2 620  ax-io 717  ax-5 1496  ax-7 1497  ax-gen 1498  ax-ie1 1542  ax-ie2 1543  ax-8 1553  ax-10 1554  ax-11 1555  ax-i12 1556  ax-bndl 1558  ax-4 1559  ax-17 1575  ax-i9 1579  ax-ial 1583  ax-i5r 1584  ax-ext 2213
This theorem depends on definitions:  df-bi 117  df-tru 1401  df-nf 1510  df-sb 1811  df-clab 2218  df-cleq 2224  df-clel 2227  df-nfc 2364  df-v 2805  df-dif 3203
This theorem is referenced by:  elndif  3333  unssin  3448  inssun  3449  noel  3500  disjel  3551  undifexmid  4289  exmidundif  4302  exmidundifim  4303  exmid1stab  4304  phpm  7095  undifdcss  7158  fsum3cvg  12002  summodclem2a  12005  fisumss  12016  isumss2  12017  binomlem  12107  fproddccvg  12196  prodmodclem2a  12200  fprodssdc  12214  fprodsplitdc  12220  ply1termlem  15536  plyaddlem1  15541  plymullem1  15542  plycoeid3  15551  dvply1  15559
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