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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 3732 | . . 3 ⊢ (𝐴 ∈ (V ∖ V) → 𝐴 ∈ V) | |
2 | eldifn 3733 | . . 3 ⊢ (𝐴 ∈ (V ∖ V) → ¬ 𝐴 ∈ V) | |
3 | 1, 2 | pm2.65i 185 | . 2 ⊢ ¬ 𝐴 ∈ (V ∖ V) |
4 | df-nul 3916 | . . 3 ⊢ ∅ = (V ∖ V) | |
5 | 4 | eleq2i 2693 | . 2 ⊢ (𝐴 ∈ ∅ ↔ 𝐴 ∈ (V ∖ V)) |
6 | 3, 5 | mtbir 313 | 1 ⊢ ¬ 𝐴 ∈ ∅ |
Colors of variables: wff setvar class |
Syntax hints: ¬ wn 3 ∈ wcel 1990 Vcvv 3200 ∖ cdif 3571 ∅c0 3915 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1722 ax-4 1737 ax-5 1839 ax-6 1888 ax-7 1935 ax-9 1999 ax-10 2019 ax-11 2034 ax-12 2047 ax-13 2246 ax-ext 2602 |
This theorem depends on definitions: df-bi 197 df-or 385 df-an 386 df-tru 1486 df-ex 1705 df-nf 1710 df-sb 1881 df-clab 2609 df-cleq 2615 df-clel 2618 df-nfc 2753 df-v 3202 df-dif 3577 df-nul 3916 |
This theorem is referenced by: n0i 3920 eq0f 3925 n0fOLD 3928 rex0 3938 rab0 3955 rab0OLD 3956 un0 3967 in0 3968 0ss 3972 sbcel12 3983 sbcel2 3989 disj 4017 r19.2zb 4061 ral0 4076 rabsnifsb 4257 int0OLD 4491 iun0 4576 br0 4701 0xp 5199 csbxp 5200 dm0 5339 dm0rn0 5342 reldm0 5343 elimasni 5492 cnv0OLD 5536 co02 5649 ord0eln0 5779 nlim0 5783 nsuceq0 5805 dffv3 6187 0fv 6227 elfv2ex 6229 mpt20 6725 el2mpt2csbcl 7250 bropopvvv 7255 bropfvvvv 7257 tz7.44-2 7503 omordi 7646 omeulem1 7662 nnmordi 7711 omabs 7727 omsmolem 7733 0er 7780 0erOLD 7781 omxpenlem 8061 en3lp 8513 cantnfle 8568 r1sdom 8637 r1pwss 8647 alephordi 8897 axdc3lem2 9273 zorn2lem7 9324 nlt1pi 9728 xrinf0 12168 elixx3g 12188 elfz2 12333 fzm1 12420 om2uzlti 12749 hashf1lem2 13240 sum0 14452 fsumsplit 14471 sumsplit 14499 fsum2dlem 14501 prod0 14673 fprod2dlem 14710 sadc0 15176 sadcp1 15177 saddisjlem 15186 smu01lem 15207 smu01 15208 smu02 15209 lcmf0 15347 prmreclem5 15624 vdwap0 15680 ram0 15726 0catg 16348 oduclatb 17144 0g0 17263 dfgrp2e 17448 cntzrcl 17760 pmtrfrn 17878 psgnunilem5 17914 gexdvds 17999 gsumzsplit 18327 dprdcntz2 18437 00lss 18942 mplcoe1 19465 mplcoe5 19468 00ply1bas 19610 dsmmbas2 20081 dsmmfi 20082 maducoeval2 20446 madugsum 20449 0ntop 20710 haust1 21156 hauspwdom 21304 kqcldsat 21536 tsmssplit 21955 ustn0 22024 0met 22171 itg11 23458 itg0 23546 bddmulibl 23605 fsumharmonic 24738 ppiublem2 24928 lgsdir2lem3 25052 uvtxa01vtx0 26297 vtxdg0v 26369 0enwwlksnge1 26749 wwlks2onv 26847 rusgr0edg 26868 clwwlks 26879 eupth2lem1 27078 helloworld 27321 topnfbey 27325 n0lpligALT 27336 isarchi 29736 measvuni 30277 ddemeas 30299 sibf0 30396 signstfvneq0 30649 opelco3 31678 wsuclem 31773 wsuclemOLD 31774 unbdqndv1 32499 bj-projval 32984 bj-df-nul 33017 bj-nuliota 33019 bj-0nmoore 33067 poimirlem30 33439 nel02 34097 pw2f1ocnv 37604 areaquad 37802 ntrneikb 38392 en3lpVD 39080 supminfxr 39694 liminf0 40025 iblempty 40181 stoweidlem34 40251 sge00 40593 vonhoire 40886 |
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