Theorem nfnegd 10870

Description: Deduction version of nfneg 10871. (Contributed by NM, 29-Feb-2008.) (Revised by Mario Carneiro, 15-Oct-2016.)

Hypothesis

Ref	Expression
nfnegd.1	⊢ (𝜑 → Ⅎ𝑥𝐴)

Assertion

Ref	Expression
nfnegd	⊢ (𝜑 → Ⅎ𝑥-𝐴)

Proof of Theorem nfnegd

Step	Hyp	Ref	Expression
1		df-neg 10862	. 2 ⊢ -𝐴 = (0 − 𝐴)
2		nfcvd 2956	. . 3 ⊢ (𝜑 → Ⅎ𝑥0)
3		nfcvd 2956	. . 3 ⊢ (𝜑 → Ⅎ𝑥 − )
4		nfnegd.1	. . 3 ⊢ (𝜑 → Ⅎ𝑥𝐴)
5	2, 3, 4	nfovd 7164	. 2 ⊢ (𝜑 → Ⅎ𝑥(0 − 𝐴))
6	1, 5	nfcxfrd 2954	1 ⊢ (𝜑 → Ⅎ𝑥-𝐴)

Syntax hints:   → wi 4  Ⅎwnfc 2936  (class class class)co 7135  0cc0 10526   − cmin 10859  -cneg 10860

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1797  ax-4 1811  ax-5 1911  ax-6 1970  ax-7 2015  ax-8 2113  ax-9 2121  ax-10 2142  ax-11 2158  ax-12 2175  ax-ext 2770

This theorem depends on definitions:  df-bi 210  df-an 400  df-or 845  df-3an 1086  df-tru 1541  df-ex 1782  df-nf 1786  df-sb 2070  df-clab 2777  df-cleq 2791  df-clel 2870  df-nfc 2938  df-ral 3111  df-rex 3112  df-v 3443  df-dif 3884  df-un 3886  df-in 3888  df-ss 3898  df-nul 4244  df-if 4426  df-sn 4526  df-pr 4528  df-op 4532  df-uni 4801  df-br 5031  df-iota 6283  df-fv 6332  df-ov 7138  df-neg 10862

This theorem is referenced by:  nfneg  10871  nfxnegd  42078