Theorem nfreu1 3028

Description: is not free in . (Contributed by NM, 19-Mar-1997.)

Assertion

Ref	Expression
nfreu1

Proof of Theorem nfreu1

Step	Hyp	Ref	Expression
1		df-reu 2814	. 2
2		nfeu1 2294	. 2
3	1, 2	nfxfr 1645	1

Syntax hints:  /\wa 369  F/wnf 1616  e.wcel 1818  E!weu 2282  E!wreu 2809

This theorem is referenced by:  riota2df  6278  2reu8  32197

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1618  ax-4 1631  ax-5 1704  ax-6 1747  ax-7 1790  ax-10 1837  ax-11 1842  ax-12 1854

This theorem depends on definitions:  df-bi 185  df-ex 1613  df-nf 1617  df-eu 2286  df-reu 2814