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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 8102 | . 2 ⊢ 2o = suc 1o | |
2 | nsuceq0 6270 | . 2 ⊢ suc 1o ≠ ∅ | |
3 | 1, 2 | eqnetri 3086 | 1 ⊢ 2o ≠ ∅ |
Colors of variables: wff setvar class |
Syntax hints: ≠ wne 3016 ∅c0 4290 suc csuc 6192 1oc1o 8094 2oc2o 8095 |
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 2157 ax-12 2173 ax-ext 2793 ax-nul 5209 |
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-v 3496 df-dif 3938 df-un 3940 df-nul 4291 df-sn 4567 df-suc 6196 df-2o 8102 |
This theorem is referenced by: snnen2o 8706 pmtrfmvdn0 18589 pmtrsn 18646 efgrcl 18840 goaln0 32640 goalr 32644 fmla0disjsuc 32645 sltval2 33163 sltintdifex 33168 onint1 33797 1oequni2o 34648 finxpreclem4 34674 finxp3o 34680 frlmpwfi 39696 clsk1indlem1 40393 |
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