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Theorem prcssprc 5289
Description: The superclass of a proper class is a proper class. (Contributed by AV, 27-Dec-2020.)
Assertion
Ref Expression
prcssprc ((𝐴 ⊆ 𝐵 ∧ 𝐴 ∉ V) → 𝐵 ∉ V)

Proof of Theorem prcssprc
StepHypRef Expression
1 ssexg 5281 . . . 4 ((𝐴 ⊆ 𝐵 ∧ 𝐵 ∈ V) → 𝐴 ∈ V)
21ex 418 . . 3 (𝐴 ⊆ 𝐵 → (𝐵 ∈ V → 𝐴 ∈ V))
32nelcon3d 3066 . 2 (𝐴 ⊆ 𝐵 → (𝐴 ∉ V → 𝐵 ∉ V))
43imp 412 1 ((𝐴 ⊆ 𝐵 ∧ 𝐴 ∉ V) → 𝐵 ∉ V)
Colors of variables:    wff setvar class
This proof depends on syntax axioms:   → wi 4   ∧ wa 401   ∈ wcel 2145   ∉ wnel 3062  Vcvv 3451   ⊆ wss 3899
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1828  ax-4 1842  ax-5 1943  ax-6 2000  ax-7 2041  ax-8 2147  ax-9 2155  ax-ext 2733  ax-sep 5249
This proof depends on definitions:  df-bi 210  df-an 402  df-3an 1105  df-tru 1573  df-ex 1813  df-sb 2100  df-clab 2740  df-cleq 2753  df-clel 2836  df-nel 3063  df-rab 3414  df-v 3453  df-in 3906  df-ss 3916
This theorem is used by:  usgrprc  29829  rgrusgrprc  30152  rgrprc  30154  fsetprcnexALT  48076
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