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Theorem eldifn 3329
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 3208 . 2 (𝐴 ∈ (𝐵𝐶) ↔ (𝐴𝐵 ∧ ¬ 𝐴𝐶))
21simprbi 275 1 (𝐴 ∈ (𝐵𝐶) → ¬ 𝐴𝐶)
Colors of variables: wff set class
Syntax hints:  ¬ wn 3  wi 4  wcel 2201  cdif 3196
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 716  ax-5 1495  ax-7 1496  ax-gen 1497  ax-ie1 1541  ax-ie2 1542  ax-8 1552  ax-10 1553  ax-11 1554  ax-i12 1555  ax-bndl 1557  ax-4 1558  ax-17 1574  ax-i9 1578  ax-ial 1582  ax-i5r 1583  ax-ext 2212
This theorem depends on definitions:  df-bi 117  df-tru 1400  df-nf 1509  df-sb 1810  df-clab 2217  df-cleq 2223  df-clel 2226  df-nfc 2362  df-v 2803  df-dif 3201
This theorem is referenced by:  elndif  3330  unssin  3445  inssun  3446  noel  3497  disjel  3548  undifexmid  4285  exmidundif  4298  exmidundifim  4299  exmid1stab  4300  phpm  7057  undifdcss  7120  fsum3cvg  11962  summodclem2a  11965  fisumss  11976  isumss2  11977  binomlem  12067  fproddccvg  12156  prodmodclem2a  12160  fprodssdc  12174  fprodsplitdc  12180  ply1termlem  15495  plyaddlem1  15500  plymullem1  15501  plycoeid3  15510  dvply1  15518
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