Theorem nfre1 2540

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 2481	. 2 |- ( E. x e. A ph <-> E. x ( x e. A /\ ph ) )
2		nfe1 1510	. 2 |- F/ x E. x ( x e. A /\ ph )
3	1, 2	nfxfr 1488	1 |- F/ x E. x e. A ph

Syntax hints:   /\ wa 104   F/wnf 1474   E.wex 1506   e. wcel 2167   E.wrex 2476

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 1461  ax-gen 1463  ax-ie1 1507

This theorem depends on definitions:  df-bi 117  df-nf 1475  df-rex 2481

This theorem is referenced by:  r19.29an  2639  nfiu1  3947  fun11iun  5528  eusvobj2  5911  fodjuomnilemdc  7219  ismkvnex  7230  prarloclem3step  7580  prmuloc2  7651  ltexprlemm  7684  caucvgprprlemaddq  7792  caucvgsrlemgt1  7879  axpre-suploclemres  7985  supinfneg  9686  infsupneg  9687  lbzbi  9707  divalglemeunn  12103  divalglemeuneg  12105  bezoutlemmain  12190  bezout  12203  lss1d  14015  pw1nct  15734  isomninnlem  15761  trirec0  15775  ismkvnnlem  15783