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Theorem difexg 4130
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 3253 . 2  |-  ( A 
\  B )  C_  A
2 ssexg 4128 . 2  |-  ( ( ( A  \  B
)  C_  A  /\  A  e.  V )  ->  ( A  \  B
)  e.  _V )
31, 2mpan 422 1  |-  ( A  e.  V  ->  ( A  \  B )  e. 
_V )
Colors of variables: wff set class
Syntax hints:    -> wi 4    e. wcel 2141   _Vcvv 2730    \ cdif 3118    C_ wss 3121
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 609  ax-in2 610  ax-io 704  ax-5 1440  ax-7 1441  ax-gen 1442  ax-ie1 1486  ax-ie2 1487  ax-8 1497  ax-10 1498  ax-11 1499  ax-i12 1500  ax-bndl 1502  ax-4 1503  ax-17 1519  ax-i9 1523  ax-ial 1527  ax-i5r 1528  ax-ext 2152  ax-sep 4107
This theorem depends on definitions:  df-bi 116  df-tru 1351  df-nf 1454  df-sb 1756  df-clab 2157  df-cleq 2163  df-clel 2166  df-nfc 2301  df-v 2732  df-dif 3123  df-in 3127  df-ss 3134
This theorem is referenced by:  frirrg  4335  2oconcl  6418  phplem4dom  6840  fidifsnen  6848  findcard  6866  findcard2  6867  findcard2s  6868  fisseneq  6909  difinfsn  7077  ismkvnex  7131  exmidfodomrlemim  7178
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