Theorem nfcvd 2393

Description: If 𝑥 is disjoint from 𝐴, then 𝑥 is not free in 𝐴. (Contributed by Mario Carneiro, 7-Oct-2016.)

Assertion

Ref	Expression
nfcvd	⊢ (𝜑 → Ⅎ𝑥𝐴)

Distinct variable group:   𝑥,𝐴

Allowed substitution hint:   𝜑(𝑥)

Proof of Theorem nfcvd

Step	Hyp	Ref	Expression
1		nfcv 2392	. 2 ⊢ Ⅎ𝑥𝐴
2	1	a1i 9	1 ⊢ (𝜑 → Ⅎ𝑥𝐴)

This proof depends on syntax axioms:   → wi 4  Ⅎwnfc 2379

This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-gen 1502  ax-17 1579

This proof depends on definitions:  df-bi 117  df-nf 1514  df-nfc 2381

This theorem is used by:  nfeld  2408  nfraldw  2582  vtoclgft  2873  vtocld  2875  sbcralt  3128  sbcrext  3129  csbied  3194  csbie2t  3196  sbcco3g  3205  csbco3g  3206  ifeqeqxdc  3687  dfnfc2  3953  eusvnfb  4602  eusv2i  4603  peano2  4744  iota2d  5367  iota2  5370  fmptcof  5878  riotaeqimp  6066  riota5f  6068  riota5  6069  fmpoco  6456  nfixpxy  7004  nfnegd  8530  iseqf1olemjpcl  10967  iseqf1olemqpcl  10968  iseqf1olemfvp  10969  seq3f1olemqsum  10972  fprodeq0g  12431  pcmpt  13152  strcollnft  17227