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Theorem vtocl3gf 2789
Description: Implicit substitution of a class for a setvar variable. (Contributed by NM, 10-Aug-2013.) (Revised by Mario Carneiro, 10-Oct-2016.)
Hypotheses
Ref Expression
vtocl3gf.a 𝑥𝐴
vtocl3gf.b 𝑦𝐴
vtocl3gf.c 𝑧𝐴
vtocl3gf.d 𝑦𝐵
vtocl3gf.e 𝑧𝐵
vtocl3gf.f 𝑧𝐶
vtocl3gf.1 𝑥𝜓
vtocl3gf.2 𝑦𝜒
vtocl3gf.3 𝑧𝜃
vtocl3gf.4 (𝑥 = 𝐴 → (𝜑𝜓))
vtocl3gf.5 (𝑦 = 𝐵 → (𝜓𝜒))
vtocl3gf.6 (𝑧 = 𝐶 → (𝜒𝜃))
vtocl3gf.7 𝜑
Assertion
Ref Expression
vtocl3gf ((𝐴𝑉𝐵𝑊𝐶𝑋) → 𝜃)

Proof of Theorem vtocl3gf
StepHypRef Expression
1 elex 2737 . . 3 (𝐴𝑉𝐴 ∈ V)
2 vtocl3gf.d . . . 4 𝑦𝐵
3 vtocl3gf.e . . . 4 𝑧𝐵
4 vtocl3gf.f . . . 4 𝑧𝐶
5 vtocl3gf.b . . . . . 6 𝑦𝐴
65nfel1 2319 . . . . 5 𝑦 𝐴 ∈ V
7 vtocl3gf.2 . . . . 5 𝑦𝜒
86, 7nfim 1560 . . . 4 𝑦(𝐴 ∈ V → 𝜒)
9 vtocl3gf.c . . . . . 6 𝑧𝐴
109nfel1 2319 . . . . 5 𝑧 𝐴 ∈ V
11 vtocl3gf.3 . . . . 5 𝑧𝜃
1210, 11nfim 1560 . . . 4 𝑧(𝐴 ∈ V → 𝜃)
13 vtocl3gf.5 . . . . 5 (𝑦 = 𝐵 → (𝜓𝜒))
1413imbi2d 229 . . . 4 (𝑦 = 𝐵 → ((𝐴 ∈ V → 𝜓) ↔ (𝐴 ∈ V → 𝜒)))
15 vtocl3gf.6 . . . . 5 (𝑧 = 𝐶 → (𝜒𝜃))
1615imbi2d 229 . . . 4 (𝑧 = 𝐶 → ((𝐴 ∈ V → 𝜒) ↔ (𝐴 ∈ V → 𝜃)))
17 vtocl3gf.a . . . . 5 𝑥𝐴
18 vtocl3gf.1 . . . . 5 𝑥𝜓
19 vtocl3gf.4 . . . . 5 (𝑥 = 𝐴 → (𝜑𝜓))
20 vtocl3gf.7 . . . . 5 𝜑
2117, 18, 19, 20vtoclgf 2784 . . . 4 (𝐴 ∈ V → 𝜓)
222, 3, 4, 8, 12, 14, 16, 21vtocl2gf 2788 . . 3 ((𝐵𝑊𝐶𝑋) → (𝐴 ∈ V → 𝜃))
231, 22mpan9 279 . 2 ((𝐴𝑉 ∧ (𝐵𝑊𝐶𝑋)) → 𝜃)
24233impb 1189 1 ((𝐴𝑉𝐵𝑊𝐶𝑋) → 𝜃)
Colors of variables: wff set class
Syntax hints:  wi 4  wa 103  wb 104  w3a 968   = wceq 1343  wnf 1448  wcel 2136  wnfc 2295  Vcvv 2726
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-io 699  ax-5 1435  ax-7 1436  ax-gen 1437  ax-ie1 1481  ax-ie2 1482  ax-8 1492  ax-10 1493  ax-11 1494  ax-i12 1495  ax-bndl 1497  ax-4 1498  ax-17 1514  ax-i9 1518  ax-ial 1522  ax-i5r 1523  ax-ext 2147
This theorem depends on definitions:  df-bi 116  df-3an 970  df-tru 1346  df-nf 1449  df-sb 1751  df-clab 2152  df-cleq 2158  df-clel 2161  df-nfc 2297  df-v 2728
This theorem is referenced by:  vtocl3gaf  2795
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