Theorem inabs 3379

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

Step	Hyp	Ref	Expression
1		ssun1 3310	. 2 |- A C_ ( A u. B )
2		df-ss 3154	. 2 |- ( A C_ ( A u. B ) <-> ( A i^i ( A u. B ) ) = A )
3	1, 2	mpbi 145	1 |- ( A i^i ( A u. B ) ) = A

Syntax hints:   = wceq 1363   u. cun 3139   i^i cin 3140   C_ wss 3141

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-io 710  ax-5 1457  ax-7 1458  ax-gen 1459  ax-ie1 1503  ax-ie2 1504  ax-8 1514  ax-10 1515  ax-11 1516  ax-i12 1517  ax-bndl 1519  ax-4 1520  ax-17 1536  ax-i9 1540  ax-ial 1544  ax-i5r 1545  ax-ext 2169

This theorem depends on definitions:  df-bi 117  df-tru 1366  df-nf 1471  df-sb 1773  df-clab 2174  df-cleq 2180  df-clel 2183  df-nfc 2318  df-v 2751  df-un 3145  df-in 3147  df-ss 3154

This theorem is referenced by: (None)