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Theorem spc3egv 2638
 Description: Existential specialization with 3 quantifiers, using implicit substitution. (Contributed by NM, 12-May-2008.)
Hypothesis
Ref Expression
spc3egv.1 ((x = A y = B z = 𝐶) → (φψ))
Assertion
Ref Expression
spc3egv ((A 𝑉 B 𝑊 𝐶 𝑋) → (ψxyzφ))
Distinct variable groups:   x,y,z,A   x,B,y,z   x,𝐶,y,z   ψ,x,y,z
Allowed substitution hints:   φ(x,y,z)   𝑉(x,y,z)   𝑊(x,y,z)   𝑋(x,y,z)

Proof of Theorem spc3egv
StepHypRef Expression
1 elisset 2562 . . . 4 (A 𝑉x x = A)
2 elisset 2562 . . . 4 (B 𝑊y y = B)
3 elisset 2562 . . . 4 (𝐶 𝑋z z = 𝐶)
41, 2, 33anim123i 1088 . . 3 ((A 𝑉 B 𝑊 𝐶 𝑋) → (x x = A y y = B z z = 𝐶))
5 eeeanv 1805 . . 3 (xyz(x = A y = B z = 𝐶) ↔ (x x = A y y = B z z = 𝐶))
64, 5sylibr 137 . 2 ((A 𝑉 B 𝑊 𝐶 𝑋) → xyz(x = A y = B z = 𝐶))
7 spc3egv.1 . . . . 5 ((x = A y = B z = 𝐶) → (φψ))
87biimprcd 149 . . . 4 (ψ → ((x = A y = B z = 𝐶) → φ))
98eximdv 1757 . . 3 (ψ → (z(x = A y = B z = 𝐶) → zφ))
1092eximdv 1759 . 2 (ψ → (xyz(x = A y = B z = 𝐶) → xyzφ))
116, 10syl5com 26 1 ((A 𝑉 B 𝑊 𝐶 𝑋) → (ψxyzφ))
 Colors of variables: wff set class Syntax hints:   → wi 4   ↔ wb 98   ∧ w3a 884   = wceq 1242  ∃wex 1378   ∈ wcel 1390 This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 99  ax-ia2 100  ax-ia3 101  ax-5 1333  ax-7 1334  ax-gen 1335  ax-ie1 1379  ax-ie2 1380  ax-8 1392  ax-4 1397  ax-17 1416  ax-i9 1420  ax-ial 1424  ax-ext 2019 This theorem depends on definitions:  df-bi 110  df-3an 886  df-nf 1347  df-sb 1643  df-clab 2024  df-cleq 2030  df-clel 2033  df-v 2553 This theorem is referenced by: (None)
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