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Theorem nftru 1352
Description: The true constant has no free variables. (This can also be proven in one step with nfv 1418, but this proof does not use ax-17 1416.) (Contributed by Mario Carneiro, 6-Oct-2016.)
Assertion
Ref Expression
nftru  F/

Proof of Theorem nftru
StepHypRef Expression
1 tru 1246 . 2
21nfth 1350 1  F/
Colors of variables: wff set class
Syntax hints:   wtru 1243   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-gen 1335
This theorem depends on definitions:  df-bi 110  df-tru 1245  df-nf 1347
This theorem is referenced by:  nfmo  1917  dvelimc  2195  nfralxy  2354  nfrexxy  2355  nfralya  2356  nfrexya  2357  nfreuxy  2478  nfsbc  2778  nfcsb  2878  nfiotaxy  4814  nfriota  5420
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