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| 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 6372 | . 2 ⊢ ∅ ∈ On | |
| 2 | 1 | ne0ii 4296 | 1 ⊢ On ≠ ∅ |
| Colors of variables: wff setvar class |
| Syntax hints: ≠ wne 2932 ∅c0 4285 Oncon0 6317 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1968 ax-7 2009 ax-8 2115 ax-9 2123 ax-ext 2708 ax-nul 5251 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3an 1088 df-tru 1544 df-fal 1554 df-ex 1781 df-sb 2068 df-clab 2715 df-cleq 2728 df-clel 2811 df-ne 2933 df-ral 3052 df-rex 3061 df-rab 3400 df-v 3442 df-dif 3904 df-un 3906 df-ss 3918 df-nul 4286 df-if 4480 df-pw 4556 df-sn 4581 df-pr 4583 df-op 4587 df-uni 4864 df-br 5099 df-tr 5206 df-po 5532 df-so 5533 df-fr 5577 df-we 5579 df-ord 6320 df-on 6321 |
| This theorem is referenced by: limon 7778 |
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