Theorem nfre1 2537

Description: x is not free in E. x e. A ph. (Contributed by NM, 19-Mar-1997.) (Revised by Mario Carneiro, 7-Oct-2016.)

Assertion

Ref	Expression
nfre1	|- F/ x E. x e. A ph

Proof of Theorem nfre1

Step	Hyp	Ref	Expression
1		df-rex 2478	. 2 |- ( E. x e. A ph <-> E. x ( x e. A /\ ph ) )
2		nfe1 1507	. 2 |- F/ x E. x ( x e. A /\ ph )
3	1, 2	nfxfr 1485	1 |- F/ x E. x e. A ph

Syntax hints:   /\ wa 104   F/wnf 1471   E.wex 1503   e. wcel 2164   E.wrex 2473

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-5 1458  ax-gen 1460  ax-ie1 1504

This theorem depends on definitions:  df-bi 117  df-nf 1472  df-rex 2478

This theorem is referenced by:  r19.29an  2636  nfiu1  3943  fun11iun  5522  eusvobj2  5905  fodjuomnilemdc  7205  ismkvnex  7216  prarloclem3step  7558  prmuloc2  7629  ltexprlemm  7662  caucvgprprlemaddq  7770  caucvgsrlemgt1  7857  axpre-suploclemres  7963  supinfneg  9663  infsupneg  9664  lbzbi  9684  divalglemeunn  12065  divalglemeuneg  12067  bezoutlemmain  12138  bezout  12151  lss1d  13882  pw1nct  15563  isomninnlem  15590  trirec0  15604  ismkvnnlem  15612