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Mirrors > Home > MPE Home > Th. List > 2on0 | Structured version Visualization version GIF version |
Description: Ordinal two is not zero. (Contributed by Scott Fenton, 17-Jun-2011.) |
Ref | Expression |
---|---|
2on0 | ⊢ 2o ≠ ∅ |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-2o 8105 | . 2 ⊢ 2o = suc 1o | |
2 | nsuceq0 6273 | . 2 ⊢ suc 1o ≠ ∅ | |
3 | 1, 2 | eqnetri 3088 | 1 ⊢ 2o ≠ ∅ |
Colors of variables: wff setvar class |
Syntax hints: ≠ wne 3018 ∅c0 4293 suc csuc 6195 1oc1o 8097 2oc2o 8098 |
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 1970 ax-7 2015 ax-8 2116 ax-9 2124 ax-10 2145 ax-11 2161 ax-12 2177 ax-ext 2795 ax-nul 5212 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-tru 1540 df-ex 1781 df-nf 1785 df-sb 2070 df-clab 2802 df-cleq 2816 df-clel 2895 df-nfc 2965 df-ne 3019 df-v 3498 df-dif 3941 df-un 3943 df-nul 4294 df-sn 4570 df-suc 6199 df-2o 8105 |
This theorem is referenced by: snnen2o 8709 pmtrfmvdn0 18592 pmtrsn 18649 efgrcl 18843 goaln0 32642 goalr 32646 fmla0disjsuc 32647 sltval2 33165 sltintdifex 33170 onint1 33799 1oequni2o 34651 finxpreclem4 34677 finxp3o 34683 frlmpwfi 39705 clsk1indlem1 40402 |
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