Theorem csbied2 3128

Description: Conversion of implicit substitution to explicit class substitution, deduction form. (Contributed by Mario Carneiro, 2-Jan-2017.)

Hypotheses

Ref	Expression
csbied2.1	|- ( ph -> A e. V )
csbied2.2	|- ( ph -> A = B )
csbied2.3	|- ( ( ph /\ x = B ) -> C = D )

Assertion

Ref	Expression
csbied2	|- ( ph -> [_ A / x ]_ C = D )

Distinct variable groups:   x, A   ph, x   x, D

Allowed substitution hints:   B( x)   C( x)   V( x)

Proof of Theorem csbied2

Step	Hyp	Ref	Expression
1		csbied2.1	. 2 |- ( ph -> A e. V )
2		id 19	. . . 4 |- ( x = A -> x = A )
3		csbied2.2	. . . 4 |- ( ph -> A = B )
4	2, 3	sylan9eqr 2248	. . 3 |- ( ( ph /\ x = A ) -> x = B )
5		csbied2.3	. . 3 |- ( ( ph /\ x = B ) -> C = D )
6	4, 5	syldan 282	. 2 |- ( ( ph /\ x = A ) -> C = D )
7	1, 6	csbied 3127	1 |- ( ph -> [_ A / x ]_ C = D )

Syntax hints:   -> wi 4   /\ wa 104   = wceq 1364   e. wcel 2164   [_csb 3080

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-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  ax-ext 2175

This theorem depends on definitions:  df-bi 117  df-3an 982  df-tru 1367  df-nf 1472  df-sb 1774  df-clab 2180  df-cleq 2186  df-clel 2189  df-nfc 2325  df-v 2762  df-sbc 2986  df-csb 3081

This theorem is referenced by: (None)