Theorem 19.2 1030

Description: Theorem 19.2 of [Margaris] p. 89, generalized to use two set variables. (Contributed by O'Cat, 31-Mar-2008.)

Assertion

Ref	Expression
19.2	|- (A.xph -> E.yph)

Proof of Theorem 19.2

Step	Hyp	Ref	Expression
1		19.8a 1029	. 2 |- (ph -> E.yph)
2	1	a4s 984	1 |- (A.xph -> E.yph)

Syntax hints:   -> wi 3  A.wal 954  E.wex 980

This theorem is referenced by:  19.39 1082  19.24 1083  19.34 1093

This theorem was proved from axioms:  ax-1 4  ax-2 5  ax-3 6  ax-mp 7  ax-4 973

This theorem depends on definitions:  df-bi 147  df-ex 981

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