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Theorem prcssprc 5288
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 5280 . . . 4 ((𝐴 ⊆ 𝐵 ∧ 𝐵 ∈ V) → 𝐴 ∈ V)
21ex 418 . . 3 (𝐴 ⊆ 𝐵 → (𝐵 ∈ V → 𝐴 ∈ V))
32nelcon3d 3065 . 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 2144   ∉ wnel 3061  Vcvv 3450   ⊆ wss 3895
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1827  ax-4 1841  ax-5 1942  ax-6 1999  ax-7 2040  ax-8 2146  ax-9 2154  ax-ext 2732  ax-sep 5248
This proof depends on definitions:  df-bi 210  df-an 402  df-3an 1105  df-tru 1572  df-ex 1812  df-sb 2099  df-clab 2739  df-cleq 2752  df-clel 2835  df-nel 3062  df-rab 3413  df-v 3452  df-ss 3896  df-in 4091
This theorem is used by:  usgrprc  29853  rgrusgrprc  30176  rgrprc  30178  fsetprcnexALT  48226
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