Theorem nfsbcd 2965

Description: Deduction version of nfsbc 2966. (Contributed by NM, 23-Nov-2005.) (Revised by Mario Carneiro, 12-Oct-2016.)

Hypotheses

Ref	Expression
nfsbcd.1	|- F/ y ph
nfsbcd.2	|- ( ph -> F/_ x A )
nfsbcd.3	|- ( ph -> F/ x ps )

Assertion

Ref	Expression
nfsbcd	|- ( ph -> F/ x [. A / y ]. ps )

Proof of Theorem nfsbcd

Step	Hyp	Ref	Expression
1		df-sbc 2947	. 2 |- ( [. A / y ]. ps <-> A e. { y | ps } )
2		nfsbcd.2	. . 3 |- ( ph -> F/_ x A )
3		nfsbcd.1	. . . 4 |- F/ y ph
4		nfsbcd.3	. . . 4 |- ( ph -> F/ x ps )
5	3, 4	nfabd 2326	. . 3 |- ( ph -> F/_ x { y | ps } )
6	2, 5	nfeld 2322	. 2 |- ( ph -> F/ x A e. { y | ps } )
7	1, 6	nfxfrd 1462	1 |- ( ph -> F/ x [. A / y ]. ps )

Syntax hints:   -> wi 4   F/wnf 1447   e. wcel 2135   {cab 2150   F/_wnfc 2293   [.wsbc 2946

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-io 699  ax-5 1434  ax-7 1435  ax-gen 1436  ax-ie1 1480  ax-ie2 1481  ax-8 1491  ax-10 1492  ax-11 1493  ax-i12 1494  ax-bndl 1496  ax-4 1497  ax-17 1513  ax-i9 1517  ax-ial 1521  ax-i5r 1522  ax-ext 2146

This theorem depends on definitions:  df-bi 116  df-nf 1448  df-sb 1750  df-clab 2151  df-cleq 2157  df-clel 2160  df-nfc 2295  df-sbc 2947

This theorem is referenced by:  nfsbc  2966  nfcsbd  3075  sbcnestgf  3091