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Theorem vtocl2dOLD 3905
 Description: Obsolete version of vtocl2d 3534 as of 19-Oct-2023. (Contributed by Thierry Arnoux, 25-Aug-2020.) (New usage is discouraged.) (Proof modification is discouraged.)
Hypotheses
Ref Expression
vtocl2dOLD.a (𝜑𝐴𝑉)
vtocl2dOLD.b (𝜑𝐵𝑊)
vtocl2dOLD.1 ((𝑥 = 𝐴𝑦 = 𝐵) → (𝜓𝜒))
vtocl2dOLD.3 (𝜑𝜓)
Assertion
Ref Expression
vtocl2dOLD (𝜑𝜒)
Distinct variable groups:   𝑥,𝐴,𝑦   𝑥,𝐵,𝑦   𝑥,𝑉   𝑥,𝑊,𝑦   𝜒,𝑥,𝑦   𝜑,𝑥,𝑦
Allowed substitution hints:   𝜓(𝑥,𝑦)   𝑉(𝑦)

Proof of Theorem vtocl2dOLD
StepHypRef Expression
1 vtocl2dOLD.b . . 3 (𝜑𝐵𝑊)
2 vtocl2dOLD.a . . 3 (𝜑𝐴𝑉)
3 nfcv 2974 . . . 4 𝑦𝐵
4 nfcv 2974 . . . 4 𝑥𝐵
5 nfcv 2974 . . . 4 𝑥𝐴
6 nfv 1916 . . . . 5 𝑦𝜑
7 nfsbc1v 3769 . . . . 5 𝑦[𝐵 / 𝑦]𝜓
86, 7nfim 1898 . . . 4 𝑦(𝜑[𝐵 / 𝑦]𝜓)
9 nfv 1916 . . . 4 𝑥(𝜑𝜒)
10 sbceq1a 3760 . . . . 5 (𝑦 = 𝐵 → (𝜓[𝐵 / 𝑦]𝜓))
1110imbi2d 344 . . . 4 (𝑦 = 𝐵 → ((𝜑𝜓) ↔ (𝜑[𝐵 / 𝑦]𝜓)))
12 sbceq1a 3760 . . . . . 6 (𝑥 = 𝐴 → ([𝐵 / 𝑦]𝜓[𝐴 / 𝑥][𝐵 / 𝑦]𝜓))
13 nfv 1916 . . . . . . . 8 𝑥𝜒
14 nfv 1916 . . . . . . . 8 𝑦𝜒
15 nfv 1916 . . . . . . . 8 𝑥 𝐵𝑊
16 vtocl2dOLD.1 . . . . . . . 8 ((𝑥 = 𝐴𝑦 = 𝐵) → (𝜓𝜒))
1713, 14, 15, 16sbc2iegf 3824 . . . . . . 7 ((𝐴𝑉𝐵𝑊) → ([𝐴 / 𝑥][𝐵 / 𝑦]𝜓𝜒))
182, 1, 17syl2anc 587 . . . . . 6 (𝜑 → ([𝐴 / 𝑥][𝐵 / 𝑦]𝜓𝜒))
1912, 18sylan9bb 513 . . . . 5 ((𝑥 = 𝐴𝜑) → ([𝐵 / 𝑦]𝜓𝜒))
2019pm5.74da 803 . . . 4 (𝑥 = 𝐴 → ((𝜑[𝐵 / 𝑦]𝜓) ↔ (𝜑𝜒)))
21 vtocl2dOLD.3 . . . 4 (𝜑𝜓)
223, 4, 5, 8, 9, 11, 20, 21vtocl2gf 3547 . . 3 ((𝐵𝑊𝐴𝑉) → (𝜑𝜒))
231, 2, 22syl2anc 587 . 2 (𝜑 → (𝜑𝜒))
2423pm2.43i 52 1 (𝜑𝜒)
 Colors of variables: wff setvar class Syntax hints:   → wi 4   ↔ wb 209   ∧ wa 399   = wceq 1538   ∈ wcel 2115  [wsbc 3749 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-ext 2793 This theorem depends on definitions:  df-bi 210  df-an 400  df-or 845  df-3an 1086  df-tru 1541  df-ex 1782  df-nf 1786  df-sb 2071  df-clab 2800  df-cleq 2814  df-clel 2892  df-nfc 2960  df-v 3473  df-sbc 3750 This theorem is referenced by: (None)
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