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Mirrors > Home > MPE Home > Th. List > noel | Structured version Visualization version GIF version |
Description: The empty set has no elements. Theorem 6.14 of [Quine] p. 44. (Contributed by NM, 21-Jun-1993.) (Proof shortened by Mario Carneiro, 1-Sep-2015.) |
Ref | Expression |
---|---|
noel | ⊢ ¬ 𝐴 ∈ ∅ |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | eldifi 3694 | . . 3 ⊢ (𝐴 ∈ (V ∖ V) → 𝐴 ∈ V) | |
2 | eldifn 3695 | . . 3 ⊢ (𝐴 ∈ (V ∖ V) → ¬ 𝐴 ∈ V) | |
3 | 1, 2 | pm2.65i 184 | . 2 ⊢ ¬ 𝐴 ∈ (V ∖ V) |
4 | df-nul 3875 | . . 3 ⊢ ∅ = (V ∖ V) | |
5 | 4 | eleq2i 2680 | . 2 ⊢ (𝐴 ∈ ∅ ↔ 𝐴 ∈ (V ∖ V)) |
6 | 3, 5 | mtbir 312 | 1 ⊢ ¬ 𝐴 ∈ ∅ |
Colors of variables: wff setvar class |
Syntax hints: ¬ wn 3 ∈ wcel 1977 Vcvv 3173 ∖ cdif 3537 ∅c0 3874 |
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 |
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-v 3175 df-dif 3543 df-nul 3875 |
This theorem is referenced by: n0i 3879 eq0f 3884 n0fOLD 3887 rex0 3894 rab0 3909 rab0OLD 3910 un0 3919 in0 3920 0ss 3924 sbcel12 3935 sbcel2 3941 disj 3969 r19.2zb 4013 ral0 4028 rabsnifsb 4201 int0OLD 4426 iun0 4512 0iun 4513 br0 4631 0xp 5122 csbxp 5123 dm0 5260 dm0rn0 5263 reldm0 5264 elimasni 5411 cnv0OLD 5455 co02 5566 ord0eln0 5696 nlim0 5700 nsuceq0 5722 dffv3 6099 0fv 6137 elfv2ex 6139 mpt20 6623 el2mpt2csbcl 7137 bropopvvv 7142 bropfvvvv 7144 tz7.44-2 7390 omordi 7533 omeulem1 7549 nnmordi 7598 omabs 7614 omsmolem 7620 0er 7667 0erOLD 7668 omxpenlem 7946 en3lp 8396 cantnfle 8451 r1sdom 8520 r1pwss 8530 alephordi 8780 axdc3lem2 9156 zorn2lem7 9207 nlt1pi 9607 xrinf0 12039 elixx3g 12059 elfz2 12204 fzm1 12289 om2uzlti 12611 hashf1lem2 13097 sum0 14299 fsumsplit 14318 sumsplit 14341 fsum2dlem 14343 prod0 14512 fprod2dlem 14549 sadc0 15014 sadcp1 15015 saddisjlem 15024 smu01lem 15045 smu01 15046 smu02 15047 lcmf0 15185 prmreclem5 15462 vdwap0 15518 ram0 15564 0catg 16171 oduclatb 16967 0g0 17086 dfgrp2e 17271 cntzrcl 17583 pmtrfrn 17701 psgnunilem5 17737 gexdvds 17822 gsumzsplit 18150 dprdcntz2 18260 00lss 18763 mplcoe1 19286 mplcoe5 19289 00ply1bas 19431 dsmmbas2 19900 dsmmfi 19901 maducoeval2 20265 madugsum 20268 0ntop 20535 haust1 20966 hauspwdom 21114 kqcldsat 21346 tsmssplit 21765 ustn0 21834 0met 21981 itg11 23264 itg0 23352 bddmulibl 23411 fsumharmonic 24538 ppiublem2 24728 lgsdir2lem3 24852 nbgra0edg 25961 uvtx01vtx 26020 clwwlknprop 26300 2wlkonot3v 26402 2spthonot3v 26403 rusgra0edg 26482 eupath2lem1 26504 helloworld 26713 topnfbey 26717 isarchi 29067 measvuni 29604 ddemeas 29626 sibf0 29723 signstfvneq0 29975 opelco3 30923 wsuclem 31017 wsuclemOLD 31018 unbdqndv1 31669 bj-projval 32177 bj-df-nul 32208 bj-nuliota 32210 finxp0 32404 poimirlem30 32609 pw2f1ocnv 36622 areaquad 36821 ntrneikb 37412 en3lpVD 38102 iblempty 38857 stoweidlem34 38927 sge00 39269 vonhoire 39563 uvtxa01vtx0 40623 vtxdg0v 40688 0enwwlksnge1 41060 wwlks2onv 41158 rusgr0edg 41176 clwwlks 41187 eupth2lem1 41386 |
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