Theorem vtoclri 2930

Description: Implicit substitution of a class for a setvar variable. (Contributed by NM, 21-Nov-1994.)

Hypotheses

Ref	Expression
vtoclri.1	|- (x = A -> (ph <-> ps))
vtoclri.2	|- A.x e. B ph

Assertion

Ref	Expression
vtoclri	|- (A e. B -> ps)

Distinct variable groups:   x,A   x,B   ps,x

Allowed substitution hint:   ph(x)

Proof of Theorem vtoclri

Step	Hyp	Ref	Expression
1		vtoclri.1	. 2 |- (x = A -> (ph <-> ps))
2		vtoclri.2	. . 3 |- A.x e. B ph
3	2	rspec 2679	. 2 |- (x e. B -> ph)
4	1, 3	vtoclga 2921	1 |- (A e. B -> ps)

Syntax hints:   -> wi 4   <-> wb 176   = wceq 1642   e. wcel 1710  A.wral 2615

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  ax-12 1925  ax-ext 2334

This theorem depends on definitions:  df-bi 177  df-or 359  df-an 360  df-tru 1319  df-ex 1542  df-nf 1545  df-sb 1649  df-clab 2340  df-cleq 2346  df-clel 2349  df-nfc 2479  df-ral 2620  df-v 2862

This theorem is referenced by: (None)