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Theorem nfnegd 11565
Description: Deduction version of nfneg 11566. (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
StepHypRef Expression
1 df-neg 11557 . 2 -𝐴 = (0 − 𝐴)
2 nfcvd 2927 . . 3 (𝜑 → Ⅎ𝑥0)
3 nfcvd 2927 . . 3 (𝜑 → Ⅎ𝑥 − )
4 nfnegd.1 . . 3 (𝜑 → Ⅎ𝑥𝐴)
52, 3, 4nfovd 7459 . 2 (𝜑 → Ⅎ𝑥(0 − 𝐴))
61, 5nfcxfrd 2925 1 (𝜑 → Ⅎ𝑥 -𝐴)
Colors of variables:    wff setvar class
This proof depends on syntax axioms:   → wi 4  Ⅎwnfc 2911  (class class class)co 7430  0cc0 11213   − cmin 11554   -cneg 11555
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1827  ax-4 1841  ax-5 1944  ax-6 2001  ax-7 2042  ax-8 2148  ax-9 2156  ax-10 2179  ax-11 2196  ax-12 2215  ax-ext 2735
This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3an 1105  df-tru 1572  df-fal 1582  df-ex 1812  df-nf 1816  df-sb 2101  df-clab 2742  df-cleq 2755  df-clel 2839  df-nfc 2913  df-ral 3081  df-rex 3091  df-rab 3417  df-v 3456  df-ss 3901  df-dif 4050  df-un 4154  df-nul 4282  df-if 4486  df-sn 4589  df-pr 4591  df-op 4839  df-uni 4871  df-br 5107  df-iota 6501  df-fv 6555  df-ov 7433  df-neg 11557
This theorem is used by:  nfneg  11566  nfxnegd  46593
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