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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 7761 | . . 3 ⊢ (Ord 𝐴 ↔ (𝐴 ∈ On ∨ 𝐴 = On)) | |
| 2 | 1 | birani 507 | . 2 ⊢ ((Ord 𝐴 ∧ ¬ 𝐴 ∈ V) → (𝐴 ∈ On ∨ 𝐴 = On)) |
| 3 | prcnel 3478 | . . 3 ⊢ (¬ 𝐴 ∈ V → ¬ 𝐴 ∈ On) | |
| 4 | 3 | adantl 485 | . 2 ⊢ ((Ord 𝐴 ∧ ¬ 𝐴 ∈ V) → ¬ 𝐴 ∈ On) |
| 5 | 2, 4 | orcnd 889 | 1 ⊢ ((Ord 𝐴 ∧ ¬ 𝐴 ∈ V) → 𝐴 = On) |
| Colors of variables: wff setvar class |
| Syntax hints: ¬ wn 3 → wi 4 ∧ wa 399 ∨ wo 858 = wceq 1559 ∈ wcel 2141 Vcvv 3453 Ord word 6341 Oncon0 6342 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1814 ax-4 1828 ax-5 1929 ax-6 1986 ax-7 2027 ax-8 2143 ax-9 2151 ax-ext 2733 ax-sep 5245 ax-pr 5389 |
| This theorem depends on definitions: df-bi 209 df-an 400 df-or 859 df-3or 1098 df-3an 1099 df-tru 1562 df-fal 1572 df-ex 1799 df-sb 2090 df-clab 2740 df-cleq 2753 df-clel 2836 df-ne 2957 df-ral 3076 df-rex 3086 df-rab 3414 df-v 3455 df-dif 3907 df-un 3909 df-in 3911 df-ss 3921 df-pss 3924 df-nul 4286 df-if 4480 df-pw 4556 df-sn 4582 df-pr 4584 df-op 4588 df-uni 4865 df-br 5100 df-opab 5162 df-tr 5207 df-eprel 5545 df-po 5553 df-so 5554 df-fr 5598 df-we 5600 df-ord 6345 df-on 6346 |
| This theorem is referenced by: ordtypeon 35350 |
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