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Theorem inabs 3229
Description: Absorption law for intersection. (Contributed by NM, 16-Apr-2006.)
Assertion
Ref Expression
inabs  |-  ( A  i^i  ( A  u.  B ) )  =  A

Proof of Theorem inabs
StepHypRef Expression
1 ssun1 3161 . 2  |-  A  C_  ( A  u.  B
)
2 df-ss 3010 . 2  |-  ( A 
C_  ( A  u.  B )  <->  ( A  i^i  ( A  u.  B
) )  =  A )
31, 2mpbi 143 1  |-  ( A  i^i  ( A  u.  B ) )  =  A
Colors of variables: wff set class
Syntax hints:    = wceq 1289    u. cun 2995    i^i cin 2996    C_ wss 2997
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-io 665  ax-5 1381  ax-7 1382  ax-gen 1383  ax-ie1 1427  ax-ie2 1428  ax-8 1440  ax-10 1441  ax-11 1442  ax-i12 1443  ax-bndl 1444  ax-4 1445  ax-17 1464  ax-i9 1468  ax-ial 1472  ax-i5r 1473  ax-ext 2070
This theorem depends on definitions:  df-bi 115  df-tru 1292  df-nf 1395  df-sb 1693  df-clab 2075  df-cleq 2081  df-clel 2084  df-nfc 2217  df-v 2621  df-un 3001  df-in 3003  df-ss 3010
This theorem is referenced by: (None)
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