Theorem hbral 2662

Description: Bound-variable hypothesis builder for restricted quantification. (Contributed by NM, 1-Sep-1999.) (Revised by David Abernethy, 13-Dec-2009.)

Hypotheses

Ref	Expression
hbral.1	|- (y e. A -> A.x y e. A)
hbral.2	|- (ph -> A.xph)

Assertion

Ref	Expression
hbral	|- (A.y e. A ph -> A.xA.y e. A ph)

Proof of Theorem hbral

Step	Hyp	Ref	Expression
1		df-ral 2619	. 2 |- (A.y e. A ph <-> A.y(y e. A -> ph))
2		hbral.1	. . . 4 |- (y e. A -> A.x y e. A)
3		hbral.2	. . . 4 |- (ph -> A.xph)
4	2, 3	hbim 1817	. . 3 |- ((y e. A -> ph) -> A.x(y e. A -> ph))
5	4	hbal 1736	. 2 |- (A.y(y e. A -> ph) -> A.xA.y(y e. A -> ph))
6	1, 5	hbxfrbi 1568	1 |- (A.y e. A ph -> A.xA.y e. A ph)

Syntax hints:   -> wi 4  A.wal 1540   e. wcel 1710  A.wral 2614

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1546  ax-5 1557  ax-17 1616  ax-9 1654  ax-8 1675  ax-6 1729  ax-7 1734  ax-11 1746

This theorem depends on definitions:  df-bi 177  df-ex 1542  df-nf 1545  df-ral 2619

This theorem is referenced by: (None)