Theorem opabid 4348

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 2803	. . 3 |- x e. _V
2		vex 2803	. . 3 |- y e. _V
3	1, 2	opex 4319	. 2 |- <. x , y >. e. _V
4		copsexg 4334	. . 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 4149	. 2 |- { <. x , y >. | ph } = { z | E. x E. y ( z = <. x , y >. /\ ph ) }
7	3, 5, 6	elab2 2952	1 |- ( <. x , y >. e. { <. x , y >. | ph } <-> ph )

Syntax hints:   /\ wa 104   <-> wb 105   = wceq 1395   E.wex 1538   e. wcel 2200   <.cop 3670   {copab 4147

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 714  ax-5 1493  ax-7 1494  ax-gen 1495  ax-ie1 1539  ax-ie2 1540  ax-8 1550  ax-10 1551  ax-11 1552  ax-i12 1553  ax-bndl 1555  ax-4 1556  ax-17 1572  ax-i9 1576  ax-ial 1580  ax-i5r 1581  ax-14 2203  ax-ext 2211  ax-sep 4205  ax-pow 4262  ax-pr 4297

This theorem depends on definitions:  df-bi 117  df-3an 1004  df-tru 1398  df-nf 1507  df-sb 1809  df-eu 2080  df-mo 2081  df-clab 2216  df-cleq 2222  df-clel 2225  df-nfc 2361  df-v 2802  df-un 3202  df-in 3204  df-ss 3211  df-pw 3652  df-sn 3673  df-pr 3674  df-op 3676  df-opab 4149

This theorem is referenced by:  opabidw  4349  opelopabsb  4352  ssopab2b  4369  dmopab  4940  rnopab  4977  funopab  5359  funco  5364  fvmptss2  5717  f1ompt  5794  ovid  6133  enssdom  6930