Theorem elab2 2974

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 2973	. 2 |- ( A e. _V -> ( A e. B <-> ps ) )
5	1, 4	ax-mp 5	1 |- ( A e. B <-> ps )

This proof depends on syntax axioms:   -> wi 4   <-> wb 105   = wceq 1402   e. wcel 2209   {cab 2224   _Vcvv 2821

This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-io 721  ax-5 1500  ax-7 1501  ax-gen 1502  ax-ie1 1546  ax-ie2 1547  ax-8 1557  ax-10 1558  ax-11 1559  ax-i12 1560  ax-bndl 1562  ax-4 1563  ax-17 1579  ax-i9 1583  ax-ial 1587  ax-i5r 1588  ax-ext 2220

This proof depends on definitions:  df-bi 117  df-tru 1405  df-nf 1514  df-sb 1816  df-clab 2225  df-cleq 2231  df-clel 2234  df-nfc 2381  df-v 2823

This theorem is used by:  elpw  3694  elint  3976  opabid  4400  elrn2  5026  elimasn  5157  oprabid  6120  tfrlem3a  6585  tfrcllemsucaccv  6629  tfrcllembxssdm  6631  tfrcllemres  6637  addnqprlemrl  7930  addnqprlemru  7931  addnqprlemfl  7932  addnqprlemfu  7933  mulnqprlemrl  7946  mulnqprlemru  7947  mulnqprlemfl  7948  mulnqprlemfu  7949  ltnqpr  7966  ltnqpri  7967  archpr  8016  cauappcvgprlemladdfu  8027  cauappcvgprlemladdfl  8028  caucvgprlemladdfu  8050  caucvgprprlemopu  8072  suplocexprlemloc  8094  4sqlem12  13210  txuni2  15482