Theorem opabid 4356

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 2806	. . 3 |- x e. _V
2		vex 2806	. . 3 |- y e. _V
3	1, 2	opex 4327	. 2 |- <. x , y >. e. _V
4		copsexg 4342	. . 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 4156	. 2 |- { <. x , y >. | ph } = { z | E. x E. y ( z = <. x , y >. /\ ph ) }
7	3, 5, 6	elab2 2955	1 |- ( <. x , y >. e. { <. x , y >. | ph } <-> ph )

Syntax hints:   /\ wa 104   <-> wb 105   = wceq 1398   E.wex 1541   e. wcel 2202   <.cop 3676   {copab 4154

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 717  ax-5 1496  ax-7 1497  ax-gen 1498  ax-ie1 1542  ax-ie2 1543  ax-8 1553  ax-10 1554  ax-11 1555  ax-i12 1556  ax-bndl 1558  ax-4 1559  ax-17 1575  ax-i9 1579  ax-ial 1583  ax-i5r 1584  ax-14 2205  ax-ext 2213  ax-sep 4212  ax-pow 4270  ax-pr 4305

This theorem depends on definitions:  df-bi 117  df-3an 1007  df-tru 1401  df-nf 1510  df-sb 1811  df-eu 2082  df-mo 2083  df-clab 2218  df-cleq 2224  df-clel 2227  df-nfc 2364  df-v 2805  df-un 3205  df-in 3207  df-ss 3214  df-pw 3658  df-sn 3679  df-pr 3680  df-op 3682  df-opab 4156

This theorem is referenced by:  opabidw  4357  opelopabsb  4360  ssopab2b  4377  dmopab  4948  rnopab  4985  funopab  5368  funco  5373  fvmptss2  5730  f1ompt  5806  ovid  6148  enssdom  6978