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Theorem difexg 4174
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 3289 . 2  |-  ( A 
\  B )  C_  A
2 ssexg 4172 . 2  |-  ( ( ( A  \  B
)  C_  A  /\  A  e.  V )  ->  ( A  \  B
)  e.  _V )
31, 2mpan 424 1  |-  ( A  e.  V  ->  ( A  \  B )  e. 
_V )
Colors of variables: wff set class
Syntax hints:    -> wi 4    e. wcel 2167   _Vcvv 2763    \ cdif 3154    C_ wss 3157
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 615  ax-in2 616  ax-io 710  ax-5 1461  ax-7 1462  ax-gen 1463  ax-ie1 1507  ax-ie2 1508  ax-8 1518  ax-10 1519  ax-11 1520  ax-i12 1521  ax-bndl 1523  ax-4 1524  ax-17 1540  ax-i9 1544  ax-ial 1548  ax-i5r 1549  ax-ext 2178  ax-sep 4151
This theorem depends on definitions:  df-bi 117  df-tru 1367  df-nf 1475  df-sb 1777  df-clab 2183  df-cleq 2189  df-clel 2192  df-nfc 2328  df-v 2765  df-dif 3159  df-in 3163  df-ss 3170
This theorem is referenced by:  frirrg  4385  2oconcl  6497  phplem4dom  6923  fidifsnen  6931  findcard  6949  findcard2  6950  findcard2s  6951  fisseneq  6995  difinfsn  7166  ismkvnex  7221  exmidfodomrlemim  7268
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