Theorem 2ralbida 2987

Description: Formula-building rule for restricted universal quantifier (deduction rule). (Contributed by NM, 24-Feb-2004.)

Hypotheses

Ref	Expression
2ralbida.1	|- F/ x ph
2ralbida.2	|- F/ y ph
2ralbida.3	|- ( ( ph /\ ( x e. A /\ y e. B ) ) -> ( ps <-> ch ) )

Assertion

Ref	Expression
2ralbida	|- ( ph -> ( A. x e. A A. y e. B ps <-> A. x e. A A. y e. B ch ) )

Distinct variable groups:   x, y   y, A

Allowed substitution hints:   ph( x, y)   ps( x, y)   ch( x, y)   A( x)   B( x, y)

Proof of Theorem 2ralbida

Step	Hyp	Ref	Expression
1		2ralbida.1	. 2 |- F/ x ph
2		2ralbida.2	. . . 4 |- F/ y ph
3		nfv 1843	. . . 4 |- F/ y x e. A
4	2, 3	nfan 1828	. . 3 |- F/ y ( ph /\ x e. A )
5		2ralbida.3	. . . 4 |- ( ( ph /\ ( x e. A /\ y e. B ) ) -> ( ps <-> ch ) )
6	5	anassrs 680	. . 3 |- ( ( ( ph /\ x e. A ) /\ y e. B ) -> ( ps <-> ch ) )
7	4, 6	ralbida 2982	. 2 |- ( ( ph /\ x e. A ) -> ( A. y e. B ps <-> A. y e. B ch ) )
8	1, 7	ralbida 2982	1 |- ( ph -> ( A. x e. A A. y e. B ps <-> A. x e. A A. y e. B ch ) )

Syntax hints:   -> wi 4   <-> wb 196   /\ wa 384   F/wnf 1708   e. wcel 1990   A.wral 2912

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1722  ax-4 1737  ax-5 1839  ax-6 1888  ax-7 1935  ax-12 2047

This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  df-tru 1486  df-ex 1705  df-nf 1710  df-ral 2917

This theorem is referenced by: (None)