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Theorem vtocl2gaf 2679
Description: Implicit substitution of 2 classes for 2 setvar variables. (Contributed by NM, 10-Aug-2013.)
Hypotheses
Ref Expression
vtocl2gaf.a 𝑥𝐴
vtocl2gaf.b 𝑦𝐴
vtocl2gaf.c 𝑦𝐵
vtocl2gaf.1 𝑥𝜓
vtocl2gaf.2 𝑦𝜒
vtocl2gaf.3 (𝑥 = 𝐴 → (𝜑𝜓))
vtocl2gaf.4 (𝑦 = 𝐵 → (𝜓𝜒))
vtocl2gaf.5 ((𝑥𝐶𝑦𝐷) → 𝜑)
Assertion
Ref Expression
vtocl2gaf ((𝐴𝐶𝐵𝐷) → 𝜒)
Distinct variable groups:   𝑥,𝑦,𝐶   𝑥,𝐷,𝑦
Allowed substitution hints:   𝜑(𝑥,𝑦)   𝜓(𝑥,𝑦)   𝜒(𝑥,𝑦)   𝐴(𝑥,𝑦)   𝐵(𝑥,𝑦)

Proof of Theorem vtocl2gaf
StepHypRef Expression
1 vtocl2gaf.a . . 3 𝑥𝐴
2 vtocl2gaf.b . . 3 𝑦𝐴
3 vtocl2gaf.c . . 3 𝑦𝐵
41nfel1 2235 . . . . 5 𝑥 𝐴𝐶
5 nfv 1464 . . . . 5 𝑥 𝑦𝐷
64, 5nfan 1500 . . . 4 𝑥(𝐴𝐶𝑦𝐷)
7 vtocl2gaf.1 . . . 4 𝑥𝜓
86, 7nfim 1507 . . 3 𝑥((𝐴𝐶𝑦𝐷) → 𝜓)
92nfel1 2235 . . . . 5 𝑦 𝐴𝐶
103nfel1 2235 . . . . 5 𝑦 𝐵𝐷
119, 10nfan 1500 . . . 4 𝑦(𝐴𝐶𝐵𝐷)
12 vtocl2gaf.2 . . . 4 𝑦𝜒
1311, 12nfim 1507 . . 3 𝑦((𝐴𝐶𝐵𝐷) → 𝜒)
14 eleq1 2147 . . . . 5 (𝑥 = 𝐴 → (𝑥𝐶𝐴𝐶))
1514anbi1d 453 . . . 4 (𝑥 = 𝐴 → ((𝑥𝐶𝑦𝐷) ↔ (𝐴𝐶𝑦𝐷)))
16 vtocl2gaf.3 . . . 4 (𝑥 = 𝐴 → (𝜑𝜓))
1715, 16imbi12d 232 . . 3 (𝑥 = 𝐴 → (((𝑥𝐶𝑦𝐷) → 𝜑) ↔ ((𝐴𝐶𝑦𝐷) → 𝜓)))
18 eleq1 2147 . . . . 5 (𝑦 = 𝐵 → (𝑦𝐷𝐵𝐷))
1918anbi2d 452 . . . 4 (𝑦 = 𝐵 → ((𝐴𝐶𝑦𝐷) ↔ (𝐴𝐶𝐵𝐷)))
20 vtocl2gaf.4 . . . 4 (𝑦 = 𝐵 → (𝜓𝜒))
2119, 20imbi12d 232 . . 3 (𝑦 = 𝐵 → (((𝐴𝐶𝑦𝐷) → 𝜓) ↔ ((𝐴𝐶𝐵𝐷) → 𝜒)))
22 vtocl2gaf.5 . . 3 ((𝑥𝐶𝑦𝐷) → 𝜑)
231, 2, 3, 8, 13, 17, 21, 22vtocl2gf 2674 . 2 ((𝐴𝐶𝐵𝐷) → ((𝐴𝐶𝐵𝐷) → 𝜒))
2423pm2.43i 48 1 ((𝐴𝐶𝐵𝐷) → 𝜒)
Colors of variables: wff set class
Syntax hints:  wi 4  wa 102  wb 103   = wceq 1287  wnf 1392  wcel 1436  wnfc 2212
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 104  ax-ia2 105  ax-ia3 106  ax-io 663  ax-5 1379  ax-7 1380  ax-gen 1381  ax-ie1 1425  ax-ie2 1426  ax-8 1438  ax-10 1439  ax-11 1440  ax-i12 1441  ax-bndl 1442  ax-4 1443  ax-17 1462  ax-i9 1466  ax-ial 1470  ax-i5r 1471  ax-ext 2067
This theorem depends on definitions:  df-bi 115  df-tru 1290  df-nf 1393  df-sb 1690  df-clab 2072  df-cleq 2078  df-clel 2081  df-nfc 2214  df-v 2617
This theorem is referenced by:  vtocl2ga  2680  ovmpt2s  5727  ov2gf  5728  ovi3  5740
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