Metamath Proof Explorer


Theorem equncom

Description: If a class equals the union of two other classes, then it equals the union of those two classes commuted. equncom was automatically derived from equncomVD using the tools program translate__without__overwriting.cmd and minimizing. (Contributed by Alan Sare, 18-Feb-2012)

Ref Expression
Assertion equncom
|- ( A = ( B u. C ) <-> A = ( C u. B ) )

Proof

Step Hyp Ref Expression
1 uncom
 |-  ( B u. C ) = ( C u. B )
2 1 eqeq2i
 |-  ( A = ( B u. C ) <-> A = ( C u. B ) )