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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 8403 | . 2 ⊢ 1o = {∅} | |
| 2 | 0ex 5242 | . . 3 ⊢ ∅ ∈ V | |
| 3 | 2 | snnz 4721 | . 2 ⊢ {∅} ≠ ∅ |
| 4 | 1, 3 | eqnetri 3003 | 1 ⊢ 1o ≠ ∅ |
| Colors of variables: wff setvar class |
| Syntax hints: ≠ wne 2933 ∅c0 4274 {csn 4568 1oc1o 8389 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1912 ax-6 1969 ax-7 2010 ax-8 2116 ax-9 2124 ax-ext 2709 ax-nul 5241 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-tru 1545 df-fal 1555 df-ex 1782 df-sb 2069 df-clab 2716 df-cleq 2729 df-clel 2812 df-ne 2934 df-v 3432 df-dif 3893 df-un 3895 df-nul 4275 df-sn 4569 df-suc 6321 df-1o 8396 |
| This theorem is referenced by: nlim1 8415 xp01disj 8417 xp01disjl 8418 enpr2d 8986 map2xp 9076 snnen2o 9146 0sdom1dom 9147 sdom1 9151 rex2dom 9154 1sdom2dom 9155 unxpdom2 9161 sucxpdom 9162 ssttrcl 9625 ttrclselem2 9636 djuin 9831 eldju2ndl 9837 updjudhcoinrg 9846 card1 9881 pm54.43lem 9913 cflim2 10174 isfin4p1 10226 dcomex 10358 pwcfsdom 10495 cfpwsdom 10496 canthp1lem2 10565 wunex2 10650 1pi 10795 fnpr2o 17510 fnpr2ob 17511 fvpr0o 17512 fvpr1o 17513 fvprif 17514 xpsfrnel 17515 setcepi 18044 setc2obas 18050 frgpuptinv 19735 frgpup3lem 19741 frgpnabllem1 19837 dmdprdpr 20015 dprdpr 20016 coe1mul2lem1 22241 2ndcdisj 23430 xpstopnlem1 23783 ltsval2 27639 nosgnn0 27641 ltsintdifex 27644 ltsres 27645 nogesgn1ores 27657 ltssolem1 27658 nosepnelem 27662 nogt01o 27679 noinfbnd1lem3 27708 noinfbnd2lem1 27713 bnj906 35093 gonan0 35595 gonar 35598 fmla0disjsuc 35601 rankeq1o 36374 onint1 36652 bj-disjsn01 37272 bj-0nel1 37273 bj-1nel0 37274 bj-pr21val 37333 bj-pr22val 37339 finxp1o 37719 finxp2o 37726 domalom 37731 wepwsolem 43485 onov0suclim 43717 clsk3nimkb 44482 clsk1indlem4 44486 clsk1indlem1 44487 nelsubc3 49543 prsthinc 49936 prstchom 50034 prstchom2ALT 50036 |
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