Theorem opabid 4350

Description: The law of concretion. Special case of Theorem 9.5 of [Quine] p. 61. (Contributed by NM, 14-Apr-1995.) (Proof shortened by Andrew Salmon, 25-Jul-2011.)

Assertion

Ref	Expression
opabid	|- ( <. x , y >. e. { <. x , y >. | ph } <-> ph )

Proof of Theorem opabid

Dummy variable z is distinct from all other variables.

Step	Hyp	Ref	Expression
1		vex 2805	. . 3 |- x e. _V
2		vex 2805	. . 3 |- y e. _V
3	1, 2	opex 4321	. 2 |- <. x , y >. e. _V
4		copsexg 4336	. . 3 |- ( z = <. x , y >. -> ( ph <-> E. x E. y ( z = <. x , y >. /\ ph ) ) )
5	4	bicomd 141	. 2 |- ( z = <. x , y >. -> ( E. x E. y ( z = <. x , y >. /\ ph ) <-> ph ) )
6		df-opab 4151	. 2 |- { <. x , y >. | ph } = { z | E. x E. y ( z = <. x , y >. /\ ph ) }
7	3, 5, 6	elab2 2954	1 |- ( <. x , y >. e. { <. x , y >. | ph } <-> ph )

Syntax hints:   /\ wa 104   <-> wb 105   = wceq 1397   E.wex 1540   e. wcel 2202   <.cop 3672   {copab 4149

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 716  ax-5 1495  ax-7 1496  ax-gen 1497  ax-ie1 1541  ax-ie2 1542  ax-8 1552  ax-10 1553  ax-11 1554  ax-i12 1555  ax-bndl 1557  ax-4 1558  ax-17 1574  ax-i9 1578  ax-ial 1582  ax-i5r 1583  ax-14 2205  ax-ext 2213  ax-sep 4207  ax-pow 4264  ax-pr 4299

This theorem depends on definitions:  df-bi 117  df-3an 1006  df-tru 1400  df-nf 1509  df-sb 1811  df-eu 2082  df-mo 2083  df-clab 2218  df-cleq 2224  df-clel 2227  df-nfc 2363  df-v 2804  df-un 3204  df-in 3206  df-ss 3213  df-pw 3654  df-sn 3675  df-pr 3676  df-op 3678  df-opab 4151

This theorem is referenced by:  opabidw  4351  opelopabsb  4354  ssopab2b  4371  dmopab  4942  rnopab  4979  funopab  5361  funco  5366  fvmptss2  5721  f1ompt  5798  ovid  6137  enssdom  6934