Users' Mathboxes Mathbox for BTernaryTau < Previous   Next >
Nearby theorems
Mirrors  >  Home  >  MPE Home  >  Th. List  >   Mathboxes  >  ordprcon Structured version   Visualization version   GIF version

Theorem ordprcon 35456
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 7782 . . 3 (Ord 𝐴 ↔ (𝐴 ∈ On ∨ 𝐴 = On))
21birani 508 . 2 ((Ord 𝐴 ∧ ¬ 𝐴 ∈ V) → (𝐴 ∈ On ∨ 𝐴 = On))
3 prcnel 3480 . . 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 1570  wcel 2143  Vcvv 3455  Ord word 6361  Oncon0 6362
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1825  ax-4 1839  ax-5 1940  ax-6 1997  ax-7 2038  ax-8 2145  ax-9 2153  ax-ext 2735  ax-sep 5258  ax-pr 5406
This theorem depends on definitions:  df-bi 210  df-an 401  df-or 861  df-3or 1104  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1810  df-sb 2097  df-clab 2742  df-cleq 2755  df-clel 2838  df-ne 2959  df-ral 3080  df-rex 3090  df-rab 3417  df-v 3457  df-dif 3909  df-un 3911  df-in 3913  df-ss 3923  df-pss 3926  df-nul 4288  df-if 4489  df-pw 4565  df-sn 4591  df-pr 4593  df-op 4597  df-uni 4874  df-br 5111  df-opab 5175  df-tr 5220  df-eprel 5563  df-po 5571  df-so 5572  df-fr 5616  df-we 5618  df-ord 6365  df-on 6366
This theorem is referenced by:  ordtypeon  35459
  Copyright terms: Public domain W3C validator