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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.) Remove dependency on ax-10 2142, ax-11 2158, and ax-12 2175. (Revised by Steven Nguyen, 3-May-2023.) |
Ref | Expression |
---|---|
noel | ⊢ ¬ 𝐴 ∈ ∅ |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | pm3.24 406 | . . . . . . 7 ⊢ ¬ (𝑦 ∈ V ∧ ¬ 𝑦 ∈ V) | |
2 | 1 | nex 1802 | . . . . . 6 ⊢ ¬ ∃𝑦(𝑦 ∈ V ∧ ¬ 𝑦 ∈ V) |
3 | df-clab 2777 | . . . . . . 7 ⊢ (𝑥 ∈ {𝑦 ∣ (𝑦 ∈ V ∧ ¬ 𝑦 ∈ V)} ↔ [𝑥 / 𝑦](𝑦 ∈ V ∧ ¬ 𝑦 ∈ V)) | |
4 | spsbe 2087 | . . . . . . 7 ⊢ ([𝑥 / 𝑦](𝑦 ∈ V ∧ ¬ 𝑦 ∈ V) → ∃𝑦(𝑦 ∈ V ∧ ¬ 𝑦 ∈ V)) | |
5 | 3, 4 | sylbi 220 | . . . . . 6 ⊢ (𝑥 ∈ {𝑦 ∣ (𝑦 ∈ V ∧ ¬ 𝑦 ∈ V)} → ∃𝑦(𝑦 ∈ V ∧ ¬ 𝑦 ∈ V)) |
6 | 2, 5 | mto 200 | . . . . 5 ⊢ ¬ 𝑥 ∈ {𝑦 ∣ (𝑦 ∈ V ∧ ¬ 𝑦 ∈ V)} |
7 | df-nul 4244 | . . . . . . 7 ⊢ ∅ = (V ∖ V) | |
8 | df-dif 3884 | . . . . . . 7 ⊢ (V ∖ V) = {𝑦 ∣ (𝑦 ∈ V ∧ ¬ 𝑦 ∈ V)} | |
9 | 7, 8 | eqtri 2821 | . . . . . 6 ⊢ ∅ = {𝑦 ∣ (𝑦 ∈ V ∧ ¬ 𝑦 ∈ V)} |
10 | 9 | eleq2i 2881 | . . . . 5 ⊢ (𝑥 ∈ ∅ ↔ 𝑥 ∈ {𝑦 ∣ (𝑦 ∈ V ∧ ¬ 𝑦 ∈ V)}) |
11 | 6, 10 | mtbir 326 | . . . 4 ⊢ ¬ 𝑥 ∈ ∅ |
12 | 11 | intnan 490 | . . 3 ⊢ ¬ (𝑥 = 𝐴 ∧ 𝑥 ∈ ∅) |
13 | 12 | nex 1802 | . 2 ⊢ ¬ ∃𝑥(𝑥 = 𝐴 ∧ 𝑥 ∈ ∅) |
14 | dfclel 2871 | . 2 ⊢ (𝐴 ∈ ∅ ↔ ∃𝑥(𝑥 = 𝐴 ∧ 𝑥 ∈ ∅)) | |
15 | 13, 14 | mtbir 326 | 1 ⊢ ¬ 𝐴 ∈ ∅ |
Colors of variables: wff setvar class |
Syntax hints: ¬ wn 3 ∧ wa 399 = wceq 1538 ∃wex 1781 [wsb 2069 ∈ wcel 2111 {cab 2776 Vcvv 3441 ∖ cdif 3878 ∅c0 4243 |
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 1911 ax-6 1970 ax-7 2015 ax-8 2113 ax-9 2121 ax-ext 2770 |
This theorem depends on definitions: df-bi 210 df-an 400 df-ex 1782 df-sb 2070 df-clab 2777 df-cleq 2791 df-clel 2870 df-dif 3884 df-nul 4244 |
This theorem is referenced by: nel02 4248 n0i 4249 eq0f 4255 eq0 4258 rex0 4271 rab0 4291 un0 4298 in0 4299 0ss 4304 sbcel12 4316 sbcel2 4323 disj 4355 disjOLD 4356 r19.2zb 4399 ral0 4414 rabsnifsb 4618 iun0 4948 br0 5079 0xp 5613 csbxp 5614 dm0 5754 dm0rn0 5759 reldm0 5762 elimasni 5923 co02 6080 ord0eln0 6213 nlim0 6217 nsuceq0 6239 dffv3 6641 0fv 6684 elfv2ex 6686 mpo0 7218 el2mpocsbcl 7763 bropopvvv 7768 bropfvvvv 7770 tz7.44-2 8026 omordi 8175 nnmordi 8240 omabs 8257 omsmolem 8263 0er 8309 omxpenlem 8601 en3lp 9061 cantnfle 9118 r1sdom 9187 r1pwss 9197 alephordi 9485 axdc3lem2 9862 zorn2lem7 9913 nlt1pi 10317 xrinf0 12719 elixx3g 12739 elfz2 12892 fzm1 12982 om2uzlti 13313 hashf1lem2 13810 sum0 15070 fsumsplit 15089 sumsplit 15115 fsum2dlem 15117 prod0 15289 fprod2dlem 15326 sadc0 15793 sadcp1 15794 saddisjlem 15803 smu01lem 15824 smu01 15825 smu02 15826 lcmf0 15968 prmreclem5 16246 vdwap0 16302 ram0 16348 0catg 16950 oduclatb 17746 0g0 17866 dfgrp2e 18121 cntzrcl 18449 pmtrfrn 18578 psgnunilem5 18614 gexdvds 18701 gsumzsplit 19040 dprdcntz2 19153 00lss 19706 dsmmfi 20427 mplcoe1 20705 mplcoe5 20708 00ply1bas 20869 maducoeval2 21245 madugsum 21248 0ntop 21510 haust1 21957 hauspwdom 22106 kqcldsat 22338 tsmssplit 22757 ustn0 22826 0met 22973 itg11 24295 itg0 24383 bddmulibl 24442 fsumharmonic 25597 ppiublem2 25787 lgsdir2lem3 25911 uvtx01vtx 27187 vtxdg0v 27263 0enwwlksnge1 27650 rusgr0edg 27759 clwwlk 27768 eupth2lem1 28003 helloworld 28250 topnfbey 28254 n0lpligALT 28267 ccatf1 30651 isarchi 30861 measvuni 31583 ddemeas 31605 sibf0 31702 signstfvneq0 31952 opelco3 33131 wsuclem 33225 unbdqndv1 33960 bj-projval 34432 bj-df-nul 34472 bj-nuliota 34474 bj-0nmoore 34527 nlpineqsn 34825 poimirlem30 35087 pw2f1ocnv 39978 areaquad 40166 eu0 40228 ntrneikb 40797 r1rankcld 40939 en3lpVD 41551 supminfxr 42103 liminf0 42435 iblempty 42607 stoweidlem34 42676 sge00 43015 vonhoire 43311 prprelprb 44034 fpprbasnn 44247 |
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