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Theorem nftru 1476
Description: The true constant has no free variables. (This can also be proven in one step with nfv 1538, but this proof does not use ax-17 1536.) (Contributed by Mario Carneiro, 6-Oct-2016.)
Assertion
Ref Expression
nftru 𝑥

Proof of Theorem nftru
StepHypRef Expression
1 tru 1367 . 2
21nfth 1474 1 𝑥
Colors of variables: wff set class
Syntax hints:  wtru 1364  wnf 1470
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-gen 1459
This theorem depends on definitions:  df-bi 117  df-tru 1366  df-nf 1471
This theorem is referenced by:  nfmo  2057  dvelimc  2353  nfralw  2526  nfralxy  2527  nfrexxy  2528  nfralya  2529  nfrexya  2530  nfreuxy  2664  nfsbc  2997  nfcsbw  3107  nfcsb  3108  nfiotaw  5196  nfriota  5855  nfixpxy  6734
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