Theorem dvelimdf 2028

Description: Deduction form of dvelimf 2027. This version may be useful if we want to avoid ax-17 1537 and use ax-16 1825 instead. (Contributed by NM, 7-Apr-2004.) (Revised by Mario Carneiro, 6-Oct-2016.) (Proof shortened by Wolf Lammen, 11-May-2018.)

Hypotheses

Ref	Expression
dvelimdf.1	|- F/ x ph
dvelimdf.2	|- F/ z ph
dvelimdf.3	|- ( ph -> F/ x ps )
dvelimdf.4	|- ( ph -> F/ z ch )
dvelimdf.5	|- ( ph -> ( z = y -> ( ps <-> ch ) ) )

Assertion

Ref	Expression
dvelimdf	|- ( ph -> ( -. A. x x = y -> F/ x ch ) )

Proof of Theorem dvelimdf

Step	Hyp	Ref	Expression
1		dvelimdf.2	. . . 4 |- F/ z ph
2		dvelimdf.3	. . . 4 |- ( ph -> F/ x ps )
3	1, 2	alrimi 1533	. . 3 |- ( ph -> A. z F/ x ps )
4		nfsb4t 2026	. . 3 |- ( A. z F/ x ps -> ( -. A. x x = y -> F/ x [ y / z ] ps ) )
5	3, 4	syl 14	. 2 |- ( ph -> ( -. A. x x = y -> F/ x [ y / z ] ps ) )
6		dvelimdf.1	. . 3 |- F/ x ph
7		dvelimdf.4	. . . 4 |- ( ph -> F/ z ch )
8		dvelimdf.5	. . . 4 |- ( ph -> ( z = y -> ( ps <-> ch ) ) )
9	1, 7, 8	sbied 1799	. . 3 |- ( ph -> ( [ y / z ] ps <-> ch ) )
10	6, 9	nfbidf 1550	. 2 |- ( ph -> ( F/ x [ y / z ] ps <-> F/ x ch ) )
11	5, 10	sylibd 149	1 |- ( ph -> ( -. A. x x = y -> F/ x ch ) )

Syntax hints:   -. wn 3   -> wi 4   <-> wb 105   A.wal 1362   F/wnf 1471   [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-in1 615  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-tru 1367  df-fal 1370  df-nf 1472  df-sb 1774

This theorem is referenced by:  dvelimdc  2353