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Theorem nftru 1396
Description: The true constant has no free variables. (This can also be proven in one step with nfv 1462, but this proof does not use ax-17 1460.) (Contributed by Mario Carneiro, 6-Oct-2016.)
Assertion
Ref Expression
nftru 𝑥

Proof of Theorem nftru
StepHypRef Expression
1 tru 1289 . 2
21nfth 1394 1 𝑥
Colors of variables: wff set class
Syntax hints:  wtru 1286  wnf 1390
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 1379
This theorem depends on definitions:  df-bi 115  df-tru 1288  df-nf 1391
This theorem is referenced by:  nfmo  1962  dvelimc  2240  nfralxy  2403  nfrexxy  2404  nfralya  2405  nfrexya  2406  nfreuxy  2529  nfsbc  2836  nfcsb  2941  nfiotaxy  4901  nfriota  5508
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