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Theorem eldifad 3077
Description: If a class is in the difference of two classes, it is also in the minuend. One-way deduction form of eldif 3075. (Contributed by David Moews, 1-May-2017.)
Hypothesis
Ref Expression
eldifad.1 (𝜑𝐴 ∈ (𝐵𝐶))
Assertion
Ref Expression
eldifad (𝜑𝐴𝐵)

Proof of Theorem eldifad
StepHypRef Expression
1 eldifad.1 . . 3 (𝜑𝐴 ∈ (𝐵𝐶))
2 eldif 3075 . . 3 (𝐴 ∈ (𝐵𝐶) ↔ (𝐴𝐵 ∧ ¬ 𝐴𝐶))
31, 2sylib 121 . 2 (𝜑 → (𝐴𝐵 ∧ ¬ 𝐴𝐶))
43simpld 111 1 (𝜑𝐴𝐵)
Colors of variables: wff set class
Syntax hints:  ¬ wn 3  wi 4  wa 103  wcel 1480  cdif 3063
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-in1 603  ax-in2 604  ax-io 698  ax-5 1423  ax-7 1424  ax-gen 1425  ax-ie1 1469  ax-ie2 1470  ax-8 1482  ax-10 1483  ax-11 1484  ax-i12 1485  ax-bndl 1486  ax-4 1487  ax-17 1506  ax-i9 1510  ax-ial 1514  ax-i5r 1515  ax-ext 2119
This theorem depends on definitions:  df-bi 116  df-tru 1334  df-nf 1437  df-sb 1736  df-clab 2124  df-cleq 2130  df-clel 2133  df-nfc 2268  df-v 2683  df-dif 3068
This theorem is referenced by:  fimax2gtri  6788  finexdc  6789  unfidisj  6803  undifdc  6805  ssfirab  6815  fnfi  6818  iunfidisj  6827  hashunlem  10543  zfz1isolemiso  10575  fsumrelem  11233  iuncld  12269  fsumcncntop  12710
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