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Mirrors > Home > MPE Home > Th. List > 1n0 | Structured version Visualization version GIF version |
Description: Ordinal one is not equal to ordinal zero. (Contributed by NM, 26-Dec-2004.) |
Ref | Expression |
---|---|
1n0 | ⊢ 1o ≠ ∅ |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df1o2 8118 | . 2 ⊢ 1o = {∅} | |
2 | 0ex 5213 | . . 3 ⊢ ∅ ∈ V | |
3 | 2 | snnz 4713 | . 2 ⊢ {∅} ≠ ∅ |
4 | 1, 3 | eqnetri 3088 | 1 ⊢ 1o ≠ ∅ |
Colors of variables: wff setvar class |
Syntax hints: ≠ wne 3018 ∅c0 4293 {csn 4569 1oc1o 8097 |
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-1o 8104 |
This theorem is referenced by: xp01disj 8122 xp01disjl 8123 map2xp 8689 sdom1 8720 1sdom 8723 unxpdom2 8728 sucxpdom 8729 djuin 9349 eldju2ndl 9355 updjudhcoinrg 9364 card1 9399 pm54.43lem 9430 cflim2 9687 isfin4p1 9739 dcomex 9871 pwcfsdom 10007 cfpwsdom 10008 canthp1lem2 10077 wunex2 10162 1pi 10307 fnpr2o 16832 fnpr2ob 16833 fvpr0o 16834 fvpr1o 16835 fvprif 16836 xpsfrnel 16837 setcepi 17350 frgpuptinv 18899 frgpup3lem 18905 frgpnabllem1 18995 dmdprdpr 19173 dprdpr 19174 coe1mul2lem1 20437 2ndcdisj 22066 xpstopnlem1 22419 bnj906 32204 gonan0 32641 gonar 32644 fmla0disjsuc 32647 sltval2 33165 nosgnn0 33167 sltintdifex 33170 sltres 33171 sltsolem1 33182 nosepnelem 33186 rankeq1o 33634 onint1 33799 bj-disjsn01 34266 bj-0nel1 34267 bj-1nel0 34268 bj-pr21val 34327 bj-pr22val 34333 finxp1o 34675 finxp2o 34682 domalom 34687 wepwsolem 39649 clsk3nimkb 40397 clsk1indlem4 40401 clsk1indlem1 40402 |
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