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Theorem nfr 1408
Description: Consequence of the definition of not-free. (Contributed by Mario Carneiro, 26-Sep-2016.)
Assertion
Ref Expression
nfr  F/

Proof of Theorem nfr
StepHypRef Expression
1 df-nf 1347 . 2  F/
2 sp 1398 . 2
31, 2sylbi 114 1  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-4 1397
This theorem depends on definitions:  df-bi 110  df-nf 1347
This theorem is referenced by:  nfri  1409  nfrd  1410  nfimd  1474  19.23t  1564  equs5or  1708  sbequi  1717  sbft  1725  sbcomxyyz  1843  rgen2a  2369
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