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Theorem nfnf1 1433
Description: is not free in  F/. (Contributed by Mario Carneiro, 11-Aug-2016.)
Assertion
Ref Expression
nfnf1  F/ F/

Proof of Theorem nfnf1
StepHypRef Expression
1 df-nf 1347 . 2  F/
2 nfa1 1431 . 2  F/
31, 2nfxfr 1360 1  F/ F/
Colors of variables: wff set class
Syntax hints:   wi 4  wal 1240   F/wnf 1346
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 99  ax-ia2 100  ax-ia3 101  ax-5 1333  ax-gen 1335  ax-ial 1424
This theorem depends on definitions:  df-bi 110  df-nf 1347
This theorem is referenced by:  nfimd  1474  nfnt  1543  nfald  1640  equs5or  1708  sbcomxyyz  1843  nfsb4t  1887  nfnfc1  2178  sbcnestgf  2891  dfnfc2  3589  bdsepnft  9321  setindft  9395  strcollnft  9414
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