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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 7459 | . 2 ⊢ 1𝑜 = {∅} | |
2 | 0ex 4718 | . . 3 ⊢ ∅ ∈ V | |
3 | 2 | snnz 4252 | . 2 ⊢ {∅} ≠ ∅ |
4 | 1, 3 | eqnetri 2852 | 1 ⊢ 1𝑜 ≠ ∅ |
Colors of variables: wff setvar class |
Syntax hints: ≠ wne 2780 ∅c0 3874 {csn 4125 1𝑜c1o 7440 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1713 ax-4 1728 ax-5 1827 ax-6 1875 ax-7 1922 ax-10 2006 ax-11 2021 ax-12 2034 ax-13 2234 ax-ext 2590 ax-nul 4717 |
This theorem depends on definitions: df-bi 196 df-or 384 df-an 385 df-tru 1478 df-ex 1696 df-nf 1701 df-sb 1868 df-clab 2597 df-cleq 2603 df-clel 2606 df-nfc 2740 df-ne 2782 df-v 3175 df-dif 3543 df-un 3545 df-nul 3875 df-sn 4126 df-suc 5646 df-1o 7447 |
This theorem is referenced by: xp01disj 7463 map2xp 8015 sdom1 8045 1sdom 8048 unxpdom2 8053 sucxpdom 8054 card1 8677 pm54.43lem 8708 cflim2 8968 isfin4-3 9020 dcomex 9152 pwcfsdom 9284 cfpwsdom 9285 canthp1lem2 9354 wunex2 9439 1pi 9584 xpscfn 16042 xpsc0 16043 xpsc1 16044 xpscfv 16045 xpsfrnel 16046 xpsfrnel2 16048 setcepi 16561 frgpuptinv 18007 frgpup3lem 18013 frgpnabllem1 18099 dmdprdpr 18271 dprdpr 18272 coe1mul2lem1 19458 2ndcdisj 21069 xpstopnlem1 21422 bnj906 30254 sltval2 31053 nosgnn0 31055 sltintdifex 31060 sltres 31061 sltsolem1 31067 rankeq1o 31448 onint1 31618 bj-disjsn01 32130 bj-0nel1 32133 bj-1nel0 32134 bj-pr21val 32194 bj-pr22val 32200 finxp1o 32405 finxp2o 32412 wepwsolem 36630 clsk3nimkb 37358 clsk1indlem4 37362 clsk1indlem1 37363 |
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