Metamath Proof Explorer


Theorem indm

Description: De Morgan's law for intersection. Theorem 5.2(13') of Stoll p. 19. (Contributed by NM, 18-Aug-2004)

Ref Expression
Assertion indm ( V ∖ ( 𝐴𝐵 ) ) = ( ( V ∖ 𝐴 ) ∪ ( V ∖ 𝐵 ) )

Proof

Step Hyp Ref Expression
1 difindi ( V ∖ ( 𝐴𝐵 ) ) = ( ( V ∖ 𝐴 ) ∪ ( V ∖ 𝐵 ) )