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Theorem nftru 1398
Description: The true constant has no free variables. (This can also be proven in one step with nfv 1464, but this proof does not use ax-17 1462.) (Contributed by Mario Carneiro, 6-Oct-2016.)
Assertion
Ref Expression
nftru 𝑥

Proof of Theorem nftru
StepHypRef Expression
1 tru 1291 . 2
21nfth 1396 1 𝑥
Colors of variables: wff set class
Syntax hints:  wtru 1288  wnf 1392
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 1381
This theorem depends on definitions:  df-bi 115  df-tru 1290  df-nf 1393
This theorem is referenced by:  nfmo  1965  dvelimc  2245  nfralxy  2410  nfrexxy  2411  nfralya  2412  nfrexya  2413  nfreuxy  2537  nfsbc  2849  nfcsb  2954  nfiotaxy  4950  nfriota  5578
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