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Theorem dvelimdc 2999
 Description: Deduction form of dvelimc 3000. Usage of this theorem is discouraged because it depends on ax-13 2391. (Contributed by Mario Carneiro, 8-Oct-2016.) (New usage is discouraged.)
Hypotheses
Ref Expression
dvelimdc.1 𝑥𝜑
dvelimdc.2 𝑧𝜑
dvelimdc.3 (𝜑𝑥𝐴)
dvelimdc.4 (𝜑𝑧𝐵)
dvelimdc.5 (𝜑 → (𝑧 = 𝑦𝐴 = 𝐵))
Assertion
Ref Expression
dvelimdc (𝜑 → (¬ ∀𝑥 𝑥 = 𝑦𝑥𝐵))

Proof of Theorem dvelimdc
Dummy variable 𝑤 is distinct from all other variables.
StepHypRef Expression
1 nfv 1916 . . 3 𝑤(𝜑 ∧ ¬ ∀𝑥 𝑥 = 𝑦)
2 dvelimdc.1 . . . . 5 𝑥𝜑
3 dvelimdc.2 . . . . 5 𝑧𝜑
4 dvelimdc.3 . . . . . 6 (𝜑𝑥𝐴)
54nfcrd 2966 . . . . 5 (𝜑 → Ⅎ𝑥 𝑤𝐴)
6 dvelimdc.4 . . . . . 6 (𝜑𝑧𝐵)
76nfcrd 2966 . . . . 5 (𝜑 → Ⅎ𝑧 𝑤𝐵)
8 dvelimdc.5 . . . . . 6 (𝜑 → (𝑧 = 𝑦𝐴 = 𝐵))
9 eleq2 2900 . . . . . 6 (𝐴 = 𝐵 → (𝑤𝐴𝑤𝐵))
108, 9syl6 35 . . . . 5 (𝜑 → (𝑧 = 𝑦 → (𝑤𝐴𝑤𝐵)))
112, 3, 5, 7, 10dvelimdf 2472 . . . 4 (𝜑 → (¬ ∀𝑥 𝑥 = 𝑦 → Ⅎ𝑥 𝑤𝐵))
1211imp 410 . . 3 ((𝜑 ∧ ¬ ∀𝑥 𝑥 = 𝑦) → Ⅎ𝑥 𝑤𝐵)
131, 12nfcd 2965 . 2 ((𝜑 ∧ ¬ ∀𝑥 𝑥 = 𝑦) → 𝑥𝐵)
1413ex 416 1 (𝜑 → (¬ ∀𝑥 𝑥 = 𝑦𝑥𝐵))
 Colors of variables: wff setvar class Syntax hints:  ¬ wn 3   → wi 4   ↔ wb 209   ∧ wa 399  ∀wal 1536   = wceq 1538  Ⅎwnf 1785   ∈ wcel 2115  Ⅎwnfc 2958 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 1912  ax-6 1971  ax-7 2016  ax-8 2117  ax-9 2125  ax-10 2146  ax-11 2162  ax-12 2178  ax-13 2391  ax-ext 2793 This theorem depends on definitions:  df-bi 210  df-an 400  df-or 845  df-tru 1541  df-ex 1782  df-nf 1786  df-cleq 2814  df-clel 2892  df-nfc 2960 This theorem is referenced by:  dvelimc  3000
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