Theorem dvelimf 2031

Description: Version of dvelim 2033 without any variable restrictions. (Contributed by NM, 1-Oct-2002.)

Hypotheses

Ref	Expression
dvelimf.1	|- ( ph -> A. x ph )
dvelimf.2	|- ( ps -> A. z ps )
dvelimf.3	|- ( z = y -> ( ph <-> ps ) )

Assertion

Ref	Expression
dvelimf	|- ( -. A. x x = y -> ( ps -> A. x ps ) )

Proof of Theorem dvelimf

Step	Hyp	Ref	Expression
1		dvelimf.1	. . 3 |- ( ph -> A. x ph )
2	1	hbsb4 2028	. 2 |- ( -. A. x x = y -> ( [ y / z ] ph -> A. x [ y / z ] ph ) )
3		dvelimf.2	. . 3 |- ( ps -> A. z ps )
4		dvelimf.3	. . 3 |- ( z = y -> ( ph <-> ps ) )
5	3, 4	sbieh 1801	. 2 |- ( [ y / z ] ph <-> ps )
6	5	albii 1481	. 2 |- ( A. x [ y / z ] ph <-> A. x ps )
7	2, 5, 6	3imtr3g 204	1 |- ( -. A. x x = y -> ( ps -> A. x ps ) )

Syntax hints:   -. wn 3   -> wi 4   <-> wb 105   A.wal 1362   [wsb 1773

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-in2 616  ax-io 710  ax-5 1458  ax-7 1459  ax-gen 1460  ax-ie1 1504  ax-ie2 1505  ax-8 1515  ax-10 1516  ax-11 1517  ax-i12 1518  ax-bndl 1520  ax-4 1521  ax-17 1537  ax-i9 1541  ax-ial 1545  ax-i5r 1546

This theorem depends on definitions:  df-bi 117  df-nf 1472  df-sb 1774

This theorem is referenced by:  dvelim  2033  dveel1  2173  dveel2  2174