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Theorem nfnth 1556
Description: No variable is (effectively) free in a non-theorem. (Contributed by Mario Carneiro, 6-Dec-2016.)
Hypothesis
Ref Expression
nfnth.1
Assertion
Ref Expression
nfnth  F/

Proof of Theorem nfnth
StepHypRef Expression
1 nfnth.1 . . 3
21pm2.21i 123 . 2
32nfi 1551 1  F/
Colors of variables: wff setvar class
Syntax hints:   wn 3  wal 1540   F/wnf 1544
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1546
This theorem depends on definitions:  df-bi 177  df-nf 1545
This theorem is referenced by: (None)
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