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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 6405 | . 2 ⊢ ∅ ∈ On | |
| 2 | 1 | ne0ii 4299 | 1 ⊢ On ≠ ∅ |
| Colors of variables: wff setvar class |
| Syntax hints: ≠ wne 2960 ∅c0 4288 Oncon0 6350 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1818 ax-4 1832 ax-5 1933 ax-6 1990 ax-7 2031 ax-8 2147 ax-9 2155 ax-ext 2737 ax-nul 5261 |
| This theorem depends on definitions: df-bi 210 df-an 401 df-or 861 df-3an 1103 df-tru 1566 df-fal 1576 df-ex 1803 df-sb 2094 df-clab 2744 df-cleq 2757 df-clel 2840 df-ne 2961 df-ral 3080 df-rex 3090 df-rab 3418 df-v 3459 df-dif 3910 df-un 3912 df-ss 3924 df-nul 4289 df-if 4484 df-pw 4560 df-sn 4586 df-pr 4588 df-op 4592 df-uni 4869 df-br 5106 df-tr 5213 df-po 5560 df-so 5561 df-fr 5605 df-we 5607 df-ord 6353 df-on 6354 |
| This theorem is referenced by: limon 7820 |
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