Theorem sbccsb2 3856

Description: Substitution into a wff expressed in using substitution into a class. (Contributed by NM, 27-Nov-2005.) (Revised by NM, 18-Aug-2018.)

Assertion

Ref	Expression
sbccsb2	|- ( [. A / x ]. ph <-> A e. [_ A / x ]_ { x | ph } )

Proof of Theorem sbccsb2

Step	Hyp	Ref	Expression
1		sbcex 3346	. 2 |- ( [. A / x ]. ph -> A e. _V )
2		elex 3127	. 2 |- ( A e. [_ A / x ]_ { x | ph } -> A e. _V )
3		abid 2454	. . . 4 |- ( x e. { x | ph } <-> ph )
4	3	sbcbii 3396	. . 3 |- ( [. A / x ]. x e. { x | ph } <-> [. A / x ]. ph )
5		sbcel12 3828	. . . 4 |- ( [. A / x ]. x e. { x | ph } <-> [_ A / x ]_ x e. [_ A / x ]_ { x | ph } )
6		csbvarg 3853	. . . . 5 |- ( A e. _V -> [_ A / x ]_ x = A )
7	6	eleq1d 2536	. . . 4 |- ( A e. _V -> ( [_ A / x ]_ x e. [_ A / x ]_ { x | ph } <-> A e. [_ A / x ]_ { x | ph } ) )
8	5, 7	syl5bb 257	. . 3 |- ( A e. _V -> ( [. A / x ]. x e. { x | ph } <-> A e. [_ A / x ]_ { x | ph } ) )
9	4, 8	syl5bbr 259	. 2 |- ( A e. _V -> ( [. A / x ]. ph <-> A e. [_ A / x ]_ { x | ph } ) )
10	1, 2, 9	pm5.21nii 353	1 |- ( [. A / x ]. ph <-> A e. [_ A / x ]_ { x | ph } )

Syntax hints:   <-> wb 184   e. wcel 1767   {cab 2452   _Vcvv 3118   [.wsbc 3336   [_csb 3440

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1601  ax-4 1612  ax-5 1680  ax-6 1719  ax-7 1739  ax-10 1786  ax-11 1791  ax-12 1803  ax-13 1968  ax-ext 2445

This theorem depends on definitions:  df-bi 185  df-or 370  df-an 371  df-tru 1382  df-fal 1385  df-ex 1597  df-nf 1600  df-sb 1712  df-clab 2453  df-cleq 2459  df-clel 2462  df-nfc 2617  df-v 3120  df-sbc 3337  df-csb 3441  df-dif 3484  df-in 3488  df-ss 3495  df-nul 3791

This theorem is referenced by: (None)