Theorem ralseu1d 17145

Description: Deduction rule: Given "all some one" applied to a class, you can extract the "for all" part. (Contributed by David A. Wheeler, 22-Jul-2026.)

Hypothesis

Ref	Expression
ralseu1d.1	|- ( ph -> A.E! x e. A ( ps -> ch ) )

Assertion

Ref	Expression
ralseu1d	|- ( ph -> A. x e. A ( ps -> ch ) )

Proof of Theorem ralseu1d

Step	Hyp	Ref	Expression
1		ralseu1d.1	. . 3 |- ( ph -> A.E! x e. A ( ps -> ch ) )
2		df-ralseu 17137	. . 3 |- ( A.E! x e. A ( ps -> ch ) <-> ( A. x e. A ( ps -> ch ) /\ E! x e. A ps ) )
3	1, 2	sylib 122	. 2 |- ( ph -> ( A. x e. A ( ps -> ch ) /\ E! x e. A ps ) )
4	3	simpld 112	1 |- ( ph -> A. x e. A ( ps -> ch ) )

Syntax hints:   -> wi 4   /\ wa 104   A.wral 2528   E!wreu 2530   A.E!wralseu 17135

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106

This theorem depends on definitions:  df-bi 117  df-ralseu 17137

This theorem is referenced by: (None)