ILE Home Intuitionistic Logic Explorer < Previous   Next >
Nearby theorems
Mirrors  >  Home  >  ILE Home  >  Th. List  >  difexg Unicode version

Theorem difexg 4123
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 3248 . 2  |-  ( A 
\  B )  C_  A
2 ssexg 4121 . 2  |-  ( ( ( A  \  B
)  C_  A  /\  A  e.  V )  ->  ( A  \  B
)  e.  _V )
31, 2mpan 421 1  |-  ( A  e.  V  ->  ( A  \  B )  e. 
_V )
Colors of variables: wff set class
Syntax hints:    -> wi 4    e. wcel 2136   _Vcvv 2726    \ cdif 3113    C_ wss 3116
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 604  ax-in2 605  ax-io 699  ax-5 1435  ax-7 1436  ax-gen 1437  ax-ie1 1481  ax-ie2 1482  ax-8 1492  ax-10 1493  ax-11 1494  ax-i12 1495  ax-bndl 1497  ax-4 1498  ax-17 1514  ax-i9 1518  ax-ial 1522  ax-i5r 1523  ax-ext 2147  ax-sep 4100
This theorem depends on definitions:  df-bi 116  df-tru 1346  df-nf 1449  df-sb 1751  df-clab 2152  df-cleq 2158  df-clel 2161  df-nfc 2297  df-v 2728  df-dif 3118  df-in 3122  df-ss 3129
This theorem is referenced by:  frirrg  4328  2oconcl  6407  phplem4dom  6828  fidifsnen  6836  findcard  6854  findcard2  6855  findcard2s  6856  fisseneq  6897  difinfsn  7065  ismkvnex  7119  exmidfodomrlemim  7157
  Copyright terms: Public domain W3C validator