| Metamath Proof Explorer |
< Previous
Next >
Nearby theorems |
||
| Mirrors > Home > MPE Home > Th. List > onn0 | Structured version Visualization version GIF version | ||
| Description: The class of all ordinal numbers is not empty. (Contributed by NM, 17-Sep-1995.) |
| Ref | Expression |
|---|---|
| onn0 | ⊢ On ≠ ∅ |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | 0elon 6397 | . 2 ⊢ ∅ ∈ On | |
| 2 | 1 | ne0ii 4296 | 1 ⊢ On ≠ ∅ |
| Colors of variables: wff setvar class |
| Syntax hints: ≠ wne 2956 ∅c0 4285 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-nul 5255 |
| This theorem depends on definitions: df-bi 209 df-an 400 df-or 859 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-ss 3921 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-tr 5207 df-po 5553 df-so 5554 df-fr 5598 df-we 5600 df-ord 6345 df-on 6346 |
| This theorem is referenced by: limon 7812 |
| Copyright terms: Public domain | W3C validator |