Theorem inindir 3299

Description: Intersection distributes over itself. (Contributed by NM, 17-Aug-2004.)

Assertion

Ref	Expression
inindir	|- ( ( A i^i B ) i^i C ) = ( ( A i^i C ) i^i ( B i^i C ) )

Proof of Theorem inindir

Step	Hyp	Ref	Expression
1		inidm 3290	. . 3 |- ( C i^i C ) = C
2	1	ineq2i 3279	. 2 |- ( ( A i^i B ) i^i ( C i^i C ) ) = ( ( A i^i B ) i^i C )
3		in4 3297	. 2 |- ( ( A i^i B ) i^i ( C i^i C ) ) = ( ( A i^i C ) i^i ( B i^i C ) )
4	2, 3	eqtr3i 2163	1 |- ( ( A i^i B ) i^i C ) = ( ( A i^i C ) i^i ( B i^i C ) )

Syntax hints:   = wceq 1332   i^i cin 3075

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 1483  ax-10 1484  ax-11 1485  ax-i12 1486  ax-bndl 1487  ax-4 1488  ax-17 1507  ax-i9 1511  ax-ial 1515  ax-i5r 1516  ax-ext 2122

This theorem depends on definitions:  df-bi 116  df-tru 1335  df-nf 1438  df-sb 1737  df-clab 2127  df-cleq 2133  df-clel 2136  df-nfc 2271  df-v 2691  df-in 3082

This theorem is referenced by:  difindir  3336  resindir  4843  restbasg  12376