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Theorem nfraldw 3308
Description: Deduction version of nfralw 3310. Version of nfrald 3371 with a disjoint variable condition, which does not require ax-13 2376. (Contributed by NM, 15-Feb-2013.) Avoid ax-9 2117, ax-ext 2707. (Revised by GG, 24-Sep-2024.)
Hypotheses
Ref Expression
nfraldw.1 𝑦𝜑
nfraldw.2 (𝜑𝑥𝐴)
nfraldw.3 (𝜑 → Ⅎ𝑥𝜓)
Assertion
Ref Expression
nfraldw (𝜑 → Ⅎ𝑥𝑦𝐴 𝜓)
Distinct variable group:   𝑥,𝑦
Allowed substitution hints:   𝜑(𝑥,𝑦)   𝜓(𝑥,𝑦)   𝐴(𝑥,𝑦)

Proof of Theorem nfraldw
StepHypRef Expression
1 df-ral 3061 . 2 (∀𝑦𝐴 𝜓 ↔ ∀𝑦(𝑦𝐴𝜓))
2 nfraldw.1 . . 3 𝑦𝜑
3 nfraldw.2 . . . . 5 (𝜑𝑥𝐴)
43nfcrd 2898 . . . 4 (𝜑 → Ⅎ𝑥 𝑦𝐴)
5 nfraldw.3 . . . 4 (𝜑 → Ⅎ𝑥𝜓)
64, 5nfimd 1893 . . 3 (𝜑 → Ⅎ𝑥(𝑦𝐴𝜓))
72, 6nfald 2327 . 2 (𝜑 → Ⅎ𝑥𝑦(𝑦𝐴𝜓))
81, 7nfxfrd 1853 1 (𝜑 → Ⅎ𝑥𝑦𝐴 𝜓)
Colors of variables: wff setvar class
Syntax hints:  wi 4  wal 1537  wnf 1782  wcel 2107  wnfc 2889  wral 3060
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1794  ax-4 1808  ax-5 1909  ax-6 1966  ax-7 2006  ax-8 2109  ax-10 2140  ax-11 2156  ax-12 2176
This theorem depends on definitions:  df-bi 207  df-an 396  df-or 848  df-ex 1779  df-nf 1783  df-clel 2815  df-nfc 2891  df-ral 3061
This theorem is referenced by:  nfrexdw  3309  nfralwOLD  3311  nfttrcld  9751
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