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Theorem eldifsni 3800
Description: Membership in a set with an element removed. (Contributed by NM, 10-Mar-2015.)
Assertion
Ref Expression
eldifsni (𝐴 ∈ (𝐵 ∖ {𝐶}) → 𝐴𝐶)

Proof of Theorem eldifsni
StepHypRef Expression
1 eldifsn 3798 . 2 (𝐴 ∈ (𝐵 ∖ {𝐶}) ↔ (𝐴𝐵𝐴𝐶))
21simprbi 275 1 (𝐴 ∈ (𝐵 ∖ {𝐶}) → 𝐴𝐶)
Colors of variables: wff set class
Syntax hints:  wi 4  wcel 2200  wne 2400  cdif 3195  {csn 3667
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 617  ax-in2 618  ax-io 714  ax-5 1493  ax-7 1494  ax-gen 1495  ax-ie1 1539  ax-ie2 1540  ax-8 1550  ax-10 1551  ax-11 1552  ax-i12 1553  ax-bndl 1555  ax-4 1556  ax-17 1572  ax-i9 1576  ax-ial 1580  ax-i5r 1581  ax-ext 2211
This theorem depends on definitions:  df-bi 117  df-tru 1398  df-nf 1507  df-sb 1809  df-clab 2216  df-cleq 2222  df-clel 2225  df-nfc 2361  df-ne 2401  df-v 2802  df-dif 3200  df-sn 3673
This theorem is referenced by:  neldifsn  3801  suppssfv  6226  suppssov1  6227  elfi2  7162  fiuni  7168  fifo  7170  en2other2  7397  oddprm  12822  ringelnzr  14191  lgslem1  15719  lgseisenlem2  15790  lgseisenlem4  15792  lgseisen  15793  lgsquadlem1  15796  lgsquad2  15802  m1lgs  15804
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