Theorem cbvoprab12 5916

Description: Rule used to change first two bound variables in an operation abstraction, using implicit substitution. (Contributed by NM, 21-Feb-2004.) (Proof shortened by Andrew Salmon, 22-Oct-2011.)

Hypotheses

Ref	Expression
cbvoprab12.1	|- F/ w ph
cbvoprab12.2	|- F/ v ph
cbvoprab12.3	|- F/ x ps
cbvoprab12.4	|- F/ y ps
cbvoprab12.5	|- ( ( x = w /\ y = v ) -> ( ph <-> ps ) )

Assertion

Ref	Expression
cbvoprab12	|- { <. <. x , y >. , z >. | ph } = { <. <. w , v >. , z >. | ps }

Distinct variable group:   x, y, z, w, v

Allowed substitution hints:   ph( x, y, z, w, v)   ps( x, y, z, w, v)

Proof of Theorem cbvoprab12

Dummy variable u is distinct from all other variables.

Step	Hyp	Ref	Expression
1		nfv 1516	. . . . 5 |- F/ w u = <. x , y >.
2		cbvoprab12.1	. . . . 5 |- F/ w ph
3	1, 2	nfan 1553	. . . 4 |- F/ w ( u = <. x , y >. /\ ph )
4		nfv 1516	. . . . 5 |- F/ v u = <. x , y >.
5		cbvoprab12.2	. . . . 5 |- F/ v ph
6	4, 5	nfan 1553	. . . 4 |- F/ v ( u = <. x , y >. /\ ph )
7		nfv 1516	. . . . 5 |- F/ x u = <. w , v >.
8		cbvoprab12.3	. . . . 5 |- F/ x ps
9	7, 8	nfan 1553	. . . 4 |- F/ x ( u = <. w , v >. /\ ps )
10		nfv 1516	. . . . 5 |- F/ y u = <. w , v >.
11		cbvoprab12.4	. . . . 5 |- F/ y ps
12	10, 11	nfan 1553	. . . 4 |- F/ y ( u = <. w , v >. /\ ps )
13		opeq12 3760	. . . . . 6 |- ( ( x = w /\ y = v ) -> <. x , y >. = <. w , v >. )
14	13	eqeq2d 2177	. . . . 5 |- ( ( x = w /\ y = v ) -> ( u = <. x , y >. <-> u = <. w , v >. ) )
15		cbvoprab12.5	. . . . 5 |- ( ( x = w /\ y = v ) -> ( ph <-> ps ) )
16	14, 15	anbi12d 465	. . . 4 |- ( ( x = w /\ y = v ) -> ( ( u = <. x , y >. /\ ph ) <-> ( u = <. w , v >. /\ ps ) ) )
17	3, 6, 9, 12, 16	cbvex2 1910	. . 3 |- ( E. x E. y ( u = <. x , y >. /\ ph ) <-> E. w E. v ( u = <. w , v >. /\ ps ) )
18	17	opabbii 4049	. 2 |- { <. u , z >. | E. x E. y ( u = <. x , y >. /\ ph ) } = { <. u , z >. | E. w E. v ( u = <. w , v >. /\ ps ) }
19		dfoprab2 5889	. 2 |- { <. <. x , y >. , z >. | ph } = { <. u , z >. | E. x E. y ( u = <. x , y >. /\ ph ) }
20		dfoprab2 5889	. 2 |- { <. <. w , v >. , z >. | ps } = { <. u , z >. | E. w E. v ( u = <. w , v >. /\ ps ) }
21	18, 19, 20	3eqtr4i 2196	1 |- { <. <. x , y >. , z >. | ph } = { <. <. w , v >. , z >. | ps }

Syntax hints:   -> wi 4   /\ wa 103   <-> wb 104   = wceq 1343   F/wnf 1448   E.wex 1480   <.cop 3579   {copab 4042   {coprab 5843

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 1435  ax-7 1436  ax-gen 1437  ax-ie1 1481  ax-ie2 1482  ax-8 1492  ax-10 1493  ax-11 1494  ax-i12 1495  ax-bndl 1497  ax-4 1498  ax-17 1514  ax-i9 1518  ax-ial 1522  ax-i5r 1523  ax-14 2139  ax-ext 2147  ax-sep 4100  ax-pow 4153  ax-pr 4187

This theorem depends on definitions:  df-bi 116  df-3an 970  df-tru 1346  df-nf 1449  df-sb 1751  df-clab 2152  df-cleq 2158  df-clel 2161  df-nfc 2297  df-v 2728  df-un 3120  df-in 3122  df-ss 3129  df-pw 3561  df-sn 3582  df-pr 3583  df-op 3585  df-opab 4044  df-oprab 5846

This theorem is referenced by:  cbvoprab12v  5917  cbvmpox  5920  dfoprab4f  6161  fmpox  6168  tposoprab  6248