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Theorem nftru 1400
Description: The true constant has no free variables. (This can also be proven in one step with nfv 1466, but this proof does not use ax-17 1464.) (Contributed by Mario Carneiro, 6-Oct-2016.)
Assertion
Ref Expression
nftru  |-  F/ x T.

Proof of Theorem nftru
StepHypRef Expression
1 tru 1293 . 2  |- T.
21nfth 1398 1  |-  F/ x T.
Colors of variables: wff set class
Syntax hints:   T. wtru 1290   F/wnf 1394
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 104  ax-ia2 105  ax-ia3 106  ax-gen 1383
This theorem depends on definitions:  df-bi 115  df-tru 1292  df-nf 1395
This theorem is referenced by:  nfmo  1968  dvelimc  2249  nfralxy  2414  nfrexxy  2415  nfralya  2416  nfrexya  2417  nfreuxy  2541  nfsbc  2858  nfcsb  2963  nfiotaxy  4971  nfriota  5599
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