Metamath Proof Explorer


Theorem 19.33-2

Description: Theorem *11.421 in WhiteheadRussell p. 163. Theorem 19.33 of Margaris p. 90 with 2 quantifiers. (Contributed by Andrew Salmon, 24-May-2011)

Ref Expression
Assertion 19.33-2
|- ( ( A. x A. y ph \/ A. x A. y ps ) -> A. x A. y ( ph \/ ps ) )

Proof

Step Hyp Ref Expression
1 orc
 |-  ( ph -> ( ph \/ ps ) )
2 1 2alimi
 |-  ( A. x A. y ph -> A. x A. y ( ph \/ ps ) )
3 olc
 |-  ( ps -> ( ph \/ ps ) )
4 3 2alimi
 |-  ( A. x A. y ps -> A. x A. y ( ph \/ ps ) )
5 2 4 jaoi
 |-  ( ( A. x A. y ph \/ A. x A. y ps ) -> A. x A. y ( ph \/ ps ) )