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Theorem nfnegd 11486
Description: Deduction version of nfneg 11487. (Contributed by NM, 29-Feb-2008.) (Revised by Mario Carneiro, 15-Oct-2016.)
Hypothesis
Ref Expression
nfnegd.1 (𝜑𝑥𝐴)
Assertion
Ref Expression
nfnegd (𝜑𝑥-𝐴)

Proof of Theorem nfnegd
StepHypRef Expression
1 df-neg 11478 . 2 -𝐴 = (0 − 𝐴)
2 nfcvd 2900 . . 3 (𝜑𝑥0)
3 nfcvd 2900 . . 3 (𝜑𝑥 − )
4 nfnegd.1 . . 3 (𝜑𝑥𝐴)
52, 3, 4nfovd 7449 . 2 (𝜑𝑥(0 − 𝐴))
61, 5nfcxfrd 2898 1 (𝜑𝑥-𝐴)
Colors of variables: wff setvar class
Syntax hints:  wi 4  wnfc 2879  (class class class)co 7420  0cc0 11139  cmin 11475  -cneg 11476
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1790  ax-4 1804  ax-5 1906  ax-6 1964  ax-7 2004  ax-8 2101  ax-9 2109  ax-10 2130  ax-11 2147  ax-12 2167  ax-ext 2699
This theorem depends on definitions:  df-bi 206  df-an 396  df-or 847  df-3an 1087  df-tru 1537  df-fal 1547  df-ex 1775  df-nf 1779  df-sb 2061  df-clab 2706  df-cleq 2720  df-clel 2806  df-nfc 2881  df-ral 3059  df-rex 3068  df-rab 3430  df-v 3473  df-dif 3950  df-un 3952  df-in 3954  df-ss 3964  df-nul 4324  df-if 4530  df-sn 4630  df-pr 4632  df-op 4636  df-uni 4909  df-br 5149  df-iota 6500  df-fv 6556  df-ov 7423  df-neg 11478
This theorem is referenced by:  nfneg  11487  nfxnegd  44823
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