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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 6239 | . 2 ⊢ ∅ ∈ On | |
2 | 1 | ne0ii 4303 | 1 ⊢ On ≠ ∅ |
Colors of variables: wff setvar class |
Syntax hints: ≠ wne 3016 ∅c0 4291 Oncon0 6186 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1792 ax-4 1806 ax-5 1907 ax-6 1966 ax-7 2011 ax-8 2112 ax-9 2120 ax-10 2141 ax-11 2156 ax-12 2172 ax-ext 2793 ax-nul 5203 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-tru 1536 df-ex 1777 df-nf 1781 df-sb 2066 df-clab 2800 df-cleq 2814 df-clel 2893 df-nfc 2963 df-ne 3017 df-ral 3143 df-rex 3144 df-rab 3147 df-v 3497 df-dif 3939 df-in 3943 df-ss 3952 df-nul 4292 df-pw 4541 df-uni 4833 df-tr 5166 df-po 5469 df-so 5470 df-fr 5509 df-we 5511 df-ord 6189 df-on 6190 |
This theorem is referenced by: limon 7545 |
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