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Theorem nfnf1 1899
Description: is not free in . (Contributed by Mario Carneiro, 11-Aug-2016.)
Assertion
Ref Expression
nfnf1

Proof of Theorem nfnf1
StepHypRef Expression
1 df-nf 1617 . 2
2 nfa1 1897 . 2
31, 2nfxfr 1645 1
Colors of variables: wff setvar class
Syntax hints:  ->wi 4  A.wal 1393  F/wnf 1616
This theorem is referenced by:  nfnt  1900  nfimd  1917  nfald  1951  nfeqf2  2041  nfsb4t  2130  nfnfc1  2622  sbcnestgf  3839  dfnfc2  4267  wl-equsal1t  29994  wl-sb6rft  29997  wl-sb8t  30000  wl-mo2t  30020  wl-mo3t  30021  wl-sb8eut  30022  bj-sbf4  34411
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-12 1854
This theorem depends on definitions:  df-bi 185  df-ex 1613  df-nf 1617
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