Theorem indifcom 3373

Description: Commutation law for intersection and difference. (Contributed by Scott Fenton, 18-Feb-2013.)

Assertion

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

Proof of Theorem indifcom

Step	Hyp	Ref	Expression
1		incom 3319	. . 3 |- ( A i^i B ) = ( B i^i A )
2	1	difeq1i 3241	. 2 |- ( ( A i^i B ) \ C ) = ( ( B i^i A ) \ C )
3		indif2 3371	. 2 |- ( A i^i ( B \ C ) ) = ( ( A i^i B ) \ C )
4		indif2 3371	. 2 |- ( B i^i ( A \ C ) ) = ( ( B i^i A ) \ C )
5	2, 3, 4	3eqtr4i 2201	1 |- ( A i^i ( B \ C ) ) = ( B i^i ( A \ C ) )

Syntax hints:   = wceq 1348   \ cdif 3118   i^i cin 3120

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 609  ax-in2 610  ax-io 704  ax-5 1440  ax-7 1441  ax-gen 1442  ax-ie1 1486  ax-ie2 1487  ax-8 1497  ax-10 1498  ax-11 1499  ax-i12 1500  ax-bndl 1502  ax-4 1503  ax-17 1519  ax-i9 1523  ax-ial 1527  ax-i5r 1528  ax-ext 2152

This theorem depends on definitions:  df-bi 116  df-tru 1351  df-nf 1454  df-sb 1756  df-clab 2157  df-cleq 2163  df-clel 2166  df-nfc 2301  df-rab 2457  df-v 2732  df-dif 3123  df-in 3127

This theorem is referenced by: (None)