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Theorem vtoclf 3407
 Description: Implicit substitution of a class for a setvar variable. This is a generalization of chvar 2423. (Contributed by NM, 30-Aug-1993.)
Hypotheses
Ref Expression
vtoclf.1 𝑥𝜓
vtoclf.2 𝐴 ∈ V
vtoclf.3 (𝑥 = 𝐴 → (𝜑𝜓))
vtoclf.4 𝜑
Assertion
Ref Expression
vtoclf 𝜓
Distinct variable group:   𝑥,𝐴
Allowed substitution hints:   𝜑(𝑥)   𝜓(𝑥)

Proof of Theorem vtoclf
StepHypRef Expression
1 vtoclf.1 . . 3 𝑥𝜓
2 vtoclf.2 . . . . 5 𝐴 ∈ V
32isseti 3358 . . . 4 𝑥 𝑥 = 𝐴
4 vtoclf.3 . . . . 5 (𝑥 = 𝐴 → (𝜑𝜓))
54biimpd 219 . . . 4 (𝑥 = 𝐴 → (𝜑𝜓))
63, 5eximii 1911 . . 3 𝑥(𝜑𝜓)
71, 619.36i 2254 . 2 (∀𝑥𝜑𝜓)
8 vtoclf.4 . 2 𝜑
97, 8mpg 1871 1 𝜓
 Colors of variables: wff setvar class Syntax hints:   → wi 4   ↔ wb 196   = wceq 1630  Ⅎwnf 1855   ∈ wcel 2144  Vcvv 3349 This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1869  ax-4 1884  ax-5 1990  ax-6 2056  ax-7 2092  ax-9 2153  ax-12 2202  ax-ext 2750 This theorem depends on definitions:  df-bi 197  df-an 383  df-tru 1633  df-ex 1852  df-nf 1857  df-sb 2049  df-clab 2757  df-cleq 2763  df-clel 2766  df-v 3351 This theorem is referenced by:  vtoclALT  3409  summolem2a  14653  prodmolem2a  14870  poimirlem24  33759  poimirlem28  33763  monotuz  38025  oddcomabszz  38028  binomcxplemnotnn0  39074  limclner  40395  climinf2mpt  40458  climinfmpt  40459  dvnmptdivc  40665  dvnmul  40670  salpreimagtge  41448  salpreimaltle  41449
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