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Mirrors > Home > ILE Home > Th. List > elon | GIF version |
Description: An ordinal number is an ordinal set. (Contributed by NM, 5-Jun-1994.) |
Ref | Expression |
---|---|
elon.1 | ⊢ 𝐴 ∈ V |
Ref | Expression |
---|---|
elon | ⊢ (𝐴 ∈ On ↔ Ord 𝐴) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | elon.1 | . 2 ⊢ 𝐴 ∈ V | |
2 | elong 4405 | . 2 ⊢ (𝐴 ∈ V → (𝐴 ∈ On ↔ Ord 𝐴)) | |
3 | 1, 2 | ax-mp 5 | 1 ⊢ (𝐴 ∈ On ↔ Ord 𝐴) |
Colors of variables: wff set class |
Syntax hints: ↔ wb 105 ∈ wcel 2164 Vcvv 2760 Ord word 4394 Oncon0 4395 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-io 710 ax-5 1458 ax-7 1459 ax-gen 1460 ax-ie1 1504 ax-ie2 1505 ax-8 1515 ax-10 1516 ax-11 1517 ax-i12 1518 ax-bndl 1520 ax-4 1521 ax-17 1537 ax-i9 1541 ax-ial 1545 ax-i5r 1546 ax-ext 2175 |
This theorem depends on definitions: df-bi 117 df-tru 1367 df-nf 1472 df-sb 1774 df-clab 2180 df-cleq 2186 df-clel 2189 df-nfc 2325 df-ral 2477 df-rex 2478 df-v 2762 df-in 3160 df-ss 3167 df-uni 3837 df-tr 4129 df-iord 4398 df-on 4400 |
This theorem is referenced by: tron 4414 0elon 4424 ordtriexmidlem 4552 ontr2exmid 4558 ordtri2or2exmidlem 4559 onsucelsucexmidlem 4562 exmidonfinlem 7255 bj-omelon 15523 |
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