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Theorem tpid3gVD 43905
Description: Virtual deduction proof of tpid3g 4775. (Contributed by Alan Sare, 24-Oct-2011.) (Proof modification is discouraged.) (New usage is discouraged.)
Assertion
Ref Expression
tpid3gVD (𝐴𝐵𝐴 ∈ {𝐶, 𝐷, 𝐴})

Proof of Theorem tpid3gVD
Dummy variable 𝑥 is distinct from all other variables.
StepHypRef Expression
1 idn2 43676 . . . . . . 7 (   𝐴𝐵   ,   𝑥 = 𝐴   ▶   𝑥 = 𝐴   )
2 3mix3 1330 . . . . . . . . . 10 (𝑥 = 𝐴 → (𝑥 = 𝐶𝑥 = 𝐷𝑥 = 𝐴))
31, 2e2 43694 . . . . . . . . 9 (   𝐴𝐵   ,   𝑥 = 𝐴   ▶   (𝑥 = 𝐶𝑥 = 𝐷𝑥 = 𝐴)   )
4 abid 2711 . . . . . . . . 9 (𝑥 ∈ {𝑥 ∣ (𝑥 = 𝐶𝑥 = 𝐷𝑥 = 𝐴)} ↔ (𝑥 = 𝐶𝑥 = 𝐷𝑥 = 𝐴))
53, 4e2bir 43696 . . . . . . . 8 (   𝐴𝐵   ,   𝑥 = 𝐴   ▶   𝑥 ∈ {𝑥 ∣ (𝑥 = 𝐶𝑥 = 𝐷𝑥 = 𝐴)}   )
6 dftp2 4692 . . . . . . . . 9 {𝐶, 𝐷, 𝐴} = {𝑥 ∣ (𝑥 = 𝐶𝑥 = 𝐷𝑥 = 𝐴)}
76eleq2i 2823 . . . . . . . 8 (𝑥 ∈ {𝐶, 𝐷, 𝐴} ↔ 𝑥 ∈ {𝑥 ∣ (𝑥 = 𝐶𝑥 = 𝐷𝑥 = 𝐴)})
85, 7e2bir 43696 . . . . . . 7 (   𝐴𝐵   ,   𝑥 = 𝐴   ▶   𝑥 ∈ {𝐶, 𝐷, 𝐴}   )
9 eleq1 2819 . . . . . . . 8 (𝑥 = 𝐴 → (𝑥 ∈ {𝐶, 𝐷, 𝐴} ↔ 𝐴 ∈ {𝐶, 𝐷, 𝐴}))
109biimpd 228 . . . . . . 7 (𝑥 = 𝐴 → (𝑥 ∈ {𝐶, 𝐷, 𝐴} → 𝐴 ∈ {𝐶, 𝐷, 𝐴}))
111, 8, 10e22 43734 . . . . . 6 (   𝐴𝐵   ,   𝑥 = 𝐴   ▶   𝐴 ∈ {𝐶, 𝐷, 𝐴}   )
1211in2 43668 . . . . 5 (   𝐴𝐵   ▶   (𝑥 = 𝐴𝐴 ∈ {𝐶, 𝐷, 𝐴})   )
1312gen11 43679 . . . 4 (   𝐴𝐵   ▶   𝑥(𝑥 = 𝐴𝐴 ∈ {𝐶, 𝐷, 𝐴})   )
14 19.23v 1943 . . . 4 (∀𝑥(𝑥 = 𝐴𝐴 ∈ {𝐶, 𝐷, 𝐴}) ↔ (∃𝑥 𝑥 = 𝐴𝐴 ∈ {𝐶, 𝐷, 𝐴}))
1513, 14e1bi 43692 . . 3 (   𝐴𝐵   ▶   (∃𝑥 𝑥 = 𝐴𝐴 ∈ {𝐶, 𝐷, 𝐴})   )
16 idn1 43637 . . . 4 (   𝐴𝐵   ▶   𝐴𝐵   )
17 elisset 2813 . . . 4 (𝐴𝐵 → ∃𝑥 𝑥 = 𝐴)
1816, 17e1a 43690 . . 3 (   𝐴𝐵   ▶   𝑥 𝑥 = 𝐴   )
19 id 22 . . 3 ((∃𝑥 𝑥 = 𝐴𝐴 ∈ {𝐶, 𝐷, 𝐴}) → (∃𝑥 𝑥 = 𝐴𝐴 ∈ {𝐶, 𝐷, 𝐴}))
2015, 18, 19e11 43751 . 2 (   𝐴𝐵   ▶   𝐴 ∈ {𝐶, 𝐷, 𝐴}   )
2120in1 43634 1 (𝐴𝐵𝐴 ∈ {𝐶, 𝐷, 𝐴})
Colors of variables: wff setvar class
Syntax hints:  wi 4  w3o 1084  wal 1537   = wceq 1539  wex 1779  wcel 2104  {cab 2707  {ctp 4631
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1795  ax-4 1809  ax-5 1911  ax-6 1969  ax-7 2009  ax-8 2106  ax-9 2114  ax-12 2169  ax-ext 2701
This theorem depends on definitions:  df-bi 206  df-an 395  df-or 844  df-3or 1086  df-tru 1542  df-ex 1780  df-sb 2066  df-clab 2708  df-cleq 2722  df-clel 2808  df-v 3474  df-un 3952  df-sn 4628  df-pr 4630  df-tp 4632  df-vd1 43633  df-vd2 43641
This theorem is referenced by: (None)
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