Theorem nfth 1398

Description: No variable is (effectively) free in a theorem. (Contributed by Mario Carneiro, 11-Aug-2016.)

Hypothesis

Ref	Expression
hbth.1	⊢ 𝜑

Assertion

Ref	Expression
nfth	⊢ Ⅎ𝑥𝜑

Proof of Theorem nfth

Step	Hyp	Ref	Expression
1		hbth.1	. . 3 ⊢ 𝜑
2	1	hbth 1397	. 2 ⊢ (𝜑 → ∀𝑥𝜑)
3	2	nfi 1396	1 ⊢ Ⅎ𝑥𝜑

Syntax hints:  Ⅎwnf 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-nf 1395

This theorem is referenced by:  nftru  1400  nfequid  1635  sbt  1714  sbc2ie  2910  omsinds  4435