Metamath Proof Explorer

Theorem 19.34

Description: Theorem 19.34 of Margaris p. 90. (Contributed by NM, 12-Mar-1993)

Ref Expression
Assertion 19.34 
|- ( ( A. x ph \/ E. x ps ) -> E. x ( ph \/ ps ) )

Proof

Step Hyp Ref Expression
1 19.2 
 |-  ( A. x ph -> E. x ph )
2 1 orim1i 
 |-  ( ( A. x ph \/ E. x ps ) -> ( E. x ph \/ E. x ps ) )
3 19.43 
 |-  ( E. x ( ph \/ ps ) <-> ( E. x ph \/ E. x ps ) )
4 2 3 sylibr 
 |-  ( ( A. x ph \/ E. x ps ) -> E. x ( ph \/ ps ) )