Theorem elab2 2988

Description: Membership in a class abstraction, using implicit substitution. (Contributed by NM, 13-Sep-1995.)

Hypotheses

Ref	Expression
elab2.1	|- A e. _V
elab2.2	|- (x = A -> (ph <-> ps))
elab2.3	|- B = {x | ph}

Assertion

Ref	Expression
elab2	|- (A e. B <-> ps)

Distinct variable groups:   ps,x   x,A

Allowed substitution hints:   ph(x)   B(x)

Proof of Theorem elab2

Step	Hyp	Ref	Expression
1		elab2.1	. 2 |- A e. _V
2		elab2.2	. . 3 |- (x = A -> (ph <-> ps))
3		elab2.3	. . 3 |- B = {x | ph}
4	2, 3	elab2g 2987	. 2 |- (A e. _V -> (A e. B <-> ps))
5	1, 4	ax-mp 8	1 |- (A e. B <-> ps)

Syntax hints:   -> wi 4   <-> wb 176   = wceq 1642   e. wcel 1710  {cab 2339  _Vcvv 2859

This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8  ax-gen 1546  ax-5 1557  ax-17 1616  ax-9 1654  ax-8 1675  ax-6 1729  ax-7 1734  ax-11 1746  ax-12 1925  ax-ext 2334

This theorem depends on definitions:  df-bi 177  df-or 359  df-an 360  df-tru 1319  df-ex 1542  df-nf 1545  df-sb 1649  df-clab 2340  df-cleq 2346  df-clel 2349  df-nfc 2478  df-v 2861

This theorem is referenced by:  elpw  3728  elint  3932  opkelopkabg  4245  0ceven  4505  eventfin  4517  oddtfin  4518  dfphi2  4569  phi11lem1  4595  0cnelphi  4597  proj1op  4600  proj2op  4601  opabid  4695  oprabid  5550  elfuns  5829