Theorem inabs 3335

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 3266	. 2 |- A C_ ( A u. B )
2		df-ss 3111	. 2 |- ( A C_ ( A u. B ) <-> ( A i^i ( A u. B ) ) = A )
3	1, 2	mpbi 144	1 |- ( A i^i ( A u. B ) ) = A

Syntax hints:   = wceq 1332   u. cun 3096   i^i cin 3097   C_ wss 3098

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-io 699  ax-5 1424  ax-7 1425  ax-gen 1426  ax-ie1 1470  ax-ie2 1471  ax-8 1481  ax-10 1482  ax-11 1483  ax-i12 1484  ax-bndl 1486  ax-4 1487  ax-17 1503  ax-i9 1507  ax-ial 1511  ax-i5r 1512  ax-ext 2136

This theorem depends on definitions:  df-bi 116  df-tru 1335  df-nf 1438  df-sb 1740  df-clab 2141  df-cleq 2147  df-clel 2150  df-nfc 2285  df-v 2711  df-un 3102  df-in 3104  df-ss 3111

This theorem is referenced by: (None)