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Theorem ordprcon 35393
Description: If an ordinal class is not a set, then it must be the proper class of all ordinals. (Contributed by BTernaryTau, 9-Jun-2026.)
Assertion
Ref Expression
ordprcon ((Ord 𝐴 ∧ ¬ 𝐴 ∈ V) → 𝐴 = On)

Proof of Theorem ordprcon
StepHypRef Expression
1 ordeleqon 7769 . . 3 (Ord 𝐴 ↔ (𝐴 ∈ On ∨ 𝐴 = On))
21birani 508 . 2 ((Ord 𝐴 ∧ ¬ 𝐴 ∈ V) → (𝐴 ∈ On ∨ 𝐴 = On))
3 prcnel 3482 . . 3 𝐴 ∈ V → ¬ 𝐴 ∈ On)
43adantl 486 . 2 ((Ord 𝐴 ∧ ¬ 𝐴 ∈ V) → ¬ 𝐴 ∈ On)
52, 4orcnd 891 1 ((Ord 𝐴 ∧ ¬ 𝐴 ∈ V) → 𝐴 = On)
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wi 4  wa 400  wo 860   = wceq 1563  wcel 2145  Vcvv 3457  Ord word 6349  Oncon0 6350
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1818  ax-4 1832  ax-5 1933  ax-6 1990  ax-7 2031  ax-8 2147  ax-9 2155  ax-ext 2737  ax-sep 5251  ax-pr 5395
This theorem depends on definitions:  df-bi 210  df-an 401  df-or 861  df-3or 1102  df-3an 1103  df-tru 1566  df-fal 1576  df-ex 1803  df-sb 2094  df-clab 2744  df-cleq 2757  df-clel 2840  df-ne 2961  df-ral 3080  df-rex 3090  df-rab 3418  df-v 3459  df-dif 3910  df-un 3912  df-in 3914  df-ss 3924  df-pss 3927  df-nul 4289  df-if 4484  df-pw 4560  df-sn 4586  df-pr 4588  df-op 4592  df-uni 4869  df-br 5106  df-opab 5168  df-tr 5213  df-eprel 5552  df-po 5560  df-so 5561  df-fr 5605  df-we 5607  df-ord 6353  df-on 6354
This theorem is referenced by:  ordtypeon  35396
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