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Theorem difexg 3919
Description: Existence of a difference. (Contributed by NM, 26-May-1998.)
Assertion
Ref Expression
difexg  |-  ( A  e.  V  ->  ( A  \  B )  e. 
_V )

Proof of Theorem difexg
StepHypRef Expression
1 difss 3098 . 2  |-  ( A 
\  B )  C_  A
2 ssexg 3917 . 2  |-  ( ( ( A  \  B
)  C_  A  /\  A  e.  V )  ->  ( A  \  B
)  e.  _V )
31, 2mpan 414 1  |-  ( A  e.  V  ->  ( A  \  B )  e. 
_V )
Colors of variables: wff set class
Syntax hints:    -> wi 4    e. wcel 1433   _Vcvv 2601    \ cdif 2970    C_ wss 2973
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 104  ax-ia2 105  ax-ia3 106  ax-in1 576  ax-in2 577  ax-io 662  ax-5 1376  ax-7 1377  ax-gen 1378  ax-ie1 1422  ax-ie2 1423  ax-8 1435  ax-10 1436  ax-11 1437  ax-i12 1438  ax-bndl 1439  ax-4 1440  ax-17 1459  ax-i9 1463  ax-ial 1467  ax-i5r 1468  ax-ext 2063  ax-sep 3896
This theorem depends on definitions:  df-bi 115  df-tru 1287  df-nf 1390  df-sb 1686  df-clab 2068  df-cleq 2074  df-clel 2077  df-nfc 2208  df-v 2603  df-dif 2975  df-in 2979  df-ss 2986
This theorem is referenced by:  frirrg  4105  2oconcl  6045  phplem4dom  6348  fidifsnen  6355  findcard  6372  findcard2  6373  findcard2s  6374
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