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Theorem nfnegd 11552
Description: Deduction version of nfneg 11553. (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 11544 . 2 -𝐴 = (0 − 𝐴)
2 nfcvd 2924 . . 3 (𝜑 → Ⅎ𝑥0)
3 nfcvd 2924 . . 3 (𝜑 → Ⅎ𝑥 − )
4 nfnegd.1 . . 3 (𝜑 → Ⅎ𝑥𝐴)
52, 3, 4nfovd 7449 . 2 (𝜑 → Ⅎ𝑥(0 − 𝐴))
61, 5nfcxfrd 2922 1 (𝜑 → Ⅎ𝑥 -𝐴)
Colors of variables:    wff setvar class
This proof depends on syntax axioms:   → wi 4  Ⅎwnfc 2908  (class class class)co 7420  0cc0 11200   − cmin 11541   -cneg 11542
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1828  ax-4 1842  ax-5 1943  ax-6 2000  ax-7 2041  ax-8 2147  ax-9 2155  ax-10 2178  ax-11 2194  ax-12 2213  ax-ext 2733
This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1813  df-nf 1817  df-sb 2100  df-clab 2740  df-cleq 2753  df-clel 2836  df-nfc 2910  df-ral 3078  df-rex 3088  df-rab 3414  df-v 3453  df-dif 3902  df-un 3904  df-ss 3916  df-nul 4280  df-if 4483  df-sn 4585  df-pr 4587  df-op 4591  df-uni 4868  df-br 5104  df-iota 6494  df-fv 6546  df-ov 7423  df-neg 11544
This theorem is used by:  nfneg  11553  nfxnegd  46450
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