Theorem csbsngVD 39129

Description: Virtual deduction proof of csbsng 4243. The following User's Proof is a Virtual Deduction proof completed automatically by the tools program completeusersproof.cmd, which invokes Mel L. O'Cat's mmj2 and Norm Megill's Metamath Proof Assistant. csbsng 4243 is csbsngVD 39129 without virtual deductions and was automatically derived from csbsngVD 39129.

1::	|- (. A e. V ->. A e. V ).
2:1:	|- (. A e. V ->. ( [. A / x ]. y = B <-> [_ A / x ]_ y = [_ A / x ]_ B ) ).
3:1:	|- (. A e. V ->. [_ A / x ]_ y = y ).
4:3:	|- (. A e. V ->. ( [_ A / x ]_ y = [_ A / x ]_ B <-> y = [_ A / x ]_ B ) ).
5:2,4:	|- (. A e. V ->. ( [. A / x ]. y = B <-> y = [_ A / x ]_ B ) ).
6:5:	|- (. A e. V ->. A. y ( [. A / x ]. y = B <-> y = [_ A / x ]_ B ) ).
7:6:	|- (. A e. V ->. { y | [. A / x ]. y = B } = { y | y = [_ A / x ]_ B } ).
8:1:	|- (. A e. V ->. { y | [. A / x ]. y = B } = [_ A / x ]_ { y | y = B } ).
9:7,8:	|- (. A e. V ->. [_ A / x ]_ { y | y = B } = { y | y = [_ A / x ]_ B } ).
10::	|- { B } = { y | y = B }
11:10:	|- A. x { B } = { y | y = B }
12:1,11:	|- (. A e. V ->. [_ A / x ]_ { B } = [_ A / x ]_ { y | y = B } ).
13:9,12:	|- (. A e. V ->. [_ A / x ]_ { B } = { y | y = [_ A / x ]_ B } ).
14::	|- { [_ A / x ]_ B } = { y | y = [_ A / x ]_ B }
15:13,14:	|- (. A e. V ->. [_ A / x ]_ { B } = { [_ A / x ]_ B } ).
qed:15:	|- ( A e. V -> [_ A / x ]_ { B } = { [_ A / x ]_ B } )

(Contributed by Alan Sare, 10-Nov-2012.) (Proof modification is discouraged.) (New usage is discouraged.)

Assertion

Ref	Expression
csbsngVD	|- ( A e. V -> [_ A / x ]_ { B } = { [_ A / x ]_ B } )

Proof of Theorem csbsngVD

Dummy variable y is distinct from all other variables.

Step	Hyp	Ref	Expression
1		idn1 38790	. . . . . . . . 9 |- (. A e. V ->. A e. V ).
2		sbceqg 3984	. . . . . . . . 9 |- ( A e. V -> ( [. A / x ]. y = B <-> [_ A / x ]_ y = [_ A / x ]_ B ) )
3	1, 2	e1a 38852	. . . . . . . 8 |- (. A e. V ->. ( [. A / x ]. y = B <-> [_ A / x ]_ y = [_ A / x ]_ B ) ).
4		csbconstg 3546	. . . . . . . . . 10 |- ( A e. V -> [_ A / x ]_ y = y )
5	1, 4	e1a 38852	. . . . . . . . 9 |- (. A e. V ->. [_ A / x ]_ y = y ).
6		eqeq1 2626	. . . . . . . . 9 |- ( [_ A / x ]_ y = y -> ( [_ A / x ]_ y = [_ A / x ]_ B <-> y = [_ A / x ]_ B ) )
7	5, 6	e1a 38852	. . . . . . . 8 |- (. A e. V ->. ( [_ A / x ]_ y = [_ A / x ]_ B <-> y = [_ A / x ]_ B ) ).
8		bibi1 341	. . . . . . . . 9 |- ( ( [. A / x ]. y = B <-> [_ A / x ]_ y = [_ A / x ]_ B ) -> ( ( [. A / x ]. y = B <-> y = [_ A / x ]_ B ) <-> ( [_ A / x ]_ y = [_ A / x ]_ B <-> y = [_ A / x ]_ B ) ) )
9	8	biimprd 238	. . . . . . . 8 |- ( ( [. A / x ]. y = B <-> [_ A / x ]_ y = [_ A / x ]_ B ) -> ( ( [_ A / x ]_ y = [_ A / x ]_ B <-> y = [_ A / x ]_ B ) -> ( [. A / x ]. y = B <-> y = [_ A / x ]_ B ) ) )
10	3, 7, 9	e11 38913	. . . . . . 7 |- (. A e. V ->. ( [. A / x ]. y = B <-> y = [_ A / x ]_ B ) ).
11	10	gen11 38841	. . . . . 6 |- (. A e. V ->. A. y ( [. A / x ]. y = B <-> y = [_ A / x ]_ B ) ).
12		abbi 2737	. . . . . . 7 |- ( A. y ( [. A / x ]. y = B <-> y = [_ A / x ]_ B ) <-> { y | [. A / x ]. y = B } = { y | y = [_ A / x ]_ B } )
13	12	biimpi 206	. . . . . 6 |- ( A. y ( [. A / x ]. y = B <-> y = [_ A / x ]_ B ) -> { y | [. A / x ]. y = B } = { y | y = [_ A / x ]_ B } )
14	11, 13	e1a 38852	. . . . 5 |- (. A e. V ->. { y | [. A / x ]. y = B } = { y | y = [_ A / x ]_ B } ).
15		csbabgOLD 39050	. . . . . . 7 |- ( A e. V -> [_ A / x ]_ { y | y = B } = { y | [. A / x ]. y = B } )
16	15	eqcomd 2628	. . . . . 6 |- ( A e. V -> { y | [. A / x ]. y = B } = [_ A / x ]_ { y | y = B } )
17	1, 16	e1a 38852	. . . . 5 |- (. A e. V ->. { y | [. A / x ]. y = B } = [_ A / x ]_ { y | y = B } ).
18		eqeq1 2626	. . . . . 6 |- ( { y | [. A / x ]. y = B } = [_ A / x ]_ { y | y = B } -> ( { y | [. A / x ]. y = B } = { y | y = [_ A / x ]_ B } <-> [_ A / x ]_ { y | y = B } = { y | y = [_ A / x ]_ B } ) )
19	18	biimpcd 239	. . . . 5 |- ( { y | [. A / x ]. y = B } = { y | y = [_ A / x ]_ B } -> ( { y | [. A / x ]. y = B } = [_ A / x ]_ { y | y = B } -> [_ A / x ]_ { y | y = B } = { y | y = [_ A / x ]_ B } ) )
20	14, 17, 19	e11 38913	. . . 4 |- (. A e. V ->. [_ A / x ]_ { y | y = B } = { y | y = [_ A / x ]_ B } ).
21		df-sn 4178	. . . . . 6 |- { B } = { y | y = B }
22	21	ax-gen 1722	. . . . 5 |- A. x { B } = { y | y = B }
23		csbeq2gOLD 38765	. . . . 5 |- ( A e. V -> ( A. x { B } = { y | y = B } -> [_ A / x ]_ { B } = [_ A / x ]_ { y | y = B } ) )
24	1, 22, 23	e10 38919	. . . 4 |- (. A e. V ->. [_ A / x ]_ { B } = [_ A / x ]_ { y | y = B } ).
25		eqeq2 2633	. . . . 5 |- ( [_ A / x ]_ { y | y = B } = { y | y = [_ A / x ]_ B } -> ( [_ A / x ]_ { B } = [_ A / x ]_ { y | y = B } <-> [_ A / x ]_ { B } = { y | y = [_ A / x ]_ B } ) )
26	25	biimpd 219	. . . 4 |- ( [_ A / x ]_ { y | y = B } = { y | y = [_ A / x ]_ B } -> ( [_ A / x ]_ { B } = [_ A / x ]_ { y | y = B } -> [_ A / x ]_ { B } = { y | y = [_ A / x ]_ B } ) )
27	20, 24, 26	e11 38913	. . 3 |- (. A e. V ->. [_ A / x ]_ { B } = { y | y = [_ A / x ]_ B } ).
28		df-sn 4178	. . 3 |- { [_ A / x ]_ B } = { y | y = [_ A / x ]_ B }
29		eqeq2 2633	. . . 4 |- ( { [_ A / x ]_ B } = { y | y = [_ A / x ]_ B } -> ( [_ A / x ]_ { B } = { [_ A / x ]_ B } <-> [_ A / x ]_ { B } = { y | y = [_ A / x ]_ B } ) )
30	29	biimprcd 240	. . 3 |- ( [_ A / x ]_ { B } = { y | y = [_ A / x ]_ B } -> ( { [_ A / x ]_ B } = { y | y = [_ A / x ]_ B } -> [_ A / x ]_ { B } = { [_ A / x ]_ B } ) )
31	27, 28, 30	e10 38919	. 2 |- (. A e. V ->. [_ A / x ]_ { B } = { [_ A / x ]_ B } ).
32	31	in1 38787	1 |- ( A e. V -> [_ A / x ]_ { B } = { [_ A / x ]_ B } )

Syntax hints:   -> wi 4   <-> wb 196   A.wal 1481   = wceq 1483   e. wcel 1990   {cab 2608   [.wsbc 3435   [_csb 3533   {csn 4177

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1722  ax-4 1737  ax-5 1839  ax-6 1888  ax-7 1935  ax-9 1999  ax-10 2019  ax-11 2034  ax-12 2047  ax-13 2246  ax-ext 2602

This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  df-tru 1486  df-ex 1705  df-nf 1710  df-sb 1881  df-clab 2609  df-cleq 2615  df-clel 2618  df-nfc 2753  df-v 3202  df-sbc 3436  df-csb 3534  df-sn 4178  df-vd1 38786

This theorem is referenced by: (None)