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| Mirrors > Home > MPE Home > Th. List > Mathboxes > ordprcon | Structured version Visualization version GIF version | ||
| 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.) |
| Ref | Expression |
|---|---|
| ordprcon | ⊢ ((Ord 𝐴 ∧ ¬ 𝐴 ∈ V) → 𝐴 = On) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | ordeleqon 7782 | . . 3 ⊢ (Ord 𝐴 ↔ (𝐴 ∈ On ∨ 𝐴 = On)) | |
| 2 | 1 | birani 508 | . 2 ⊢ ((Ord 𝐴 ∧ ¬ 𝐴 ∈ V) → (𝐴 ∈ On ∨ 𝐴 = On)) |
| 3 | prcnel 3480 | . . 3 ⊢ (¬ 𝐴 ∈ V → ¬ 𝐴 ∈ On) | |
| 4 | 3 | adantl 486 | . 2 ⊢ ((Ord 𝐴 ∧ ¬ 𝐴 ∈ V) → ¬ 𝐴 ∈ On) |
| 5 | 2, 4 | orcnd 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 |
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