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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 2145, ax-11 2161, and ax-12 2177. (Revised by Steven Nguyen, 3-May-2023.) |
Ref | Expression |
---|---|
noel | ⊢ ¬ 𝐴 ∈ ∅ |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | pm3.24 405 | . . . . . . 7 ⊢ ¬ (𝑦 ∈ V ∧ ¬ 𝑦 ∈ V) | |
2 | 1 | nex 1801 | . . . . . 6 ⊢ ¬ ∃𝑦(𝑦 ∈ V ∧ ¬ 𝑦 ∈ V) |
3 | df-clab 2800 | . . . . . . 7 ⊢ (𝑥 ∈ {𝑦 ∣ (𝑦 ∈ V ∧ ¬ 𝑦 ∈ V)} ↔ [𝑥 / 𝑦](𝑦 ∈ V ∧ ¬ 𝑦 ∈ V)) | |
4 | spsbe 2088 | . . . . . . 7 ⊢ ([𝑥 / 𝑦](𝑦 ∈ V ∧ ¬ 𝑦 ∈ V) → ∃𝑦(𝑦 ∈ V ∧ ¬ 𝑦 ∈ V)) | |
5 | 3, 4 | sylbi 219 | . . . . . 6 ⊢ (𝑥 ∈ {𝑦 ∣ (𝑦 ∈ V ∧ ¬ 𝑦 ∈ V)} → ∃𝑦(𝑦 ∈ V ∧ ¬ 𝑦 ∈ V)) |
6 | 2, 5 | mto 199 | . . . . 5 ⊢ ¬ 𝑥 ∈ {𝑦 ∣ (𝑦 ∈ V ∧ ¬ 𝑦 ∈ V)} |
7 | df-nul 4292 | . . . . . . 7 ⊢ ∅ = (V ∖ V) | |
8 | df-dif 3939 | . . . . . . 7 ⊢ (V ∖ V) = {𝑦 ∣ (𝑦 ∈ V ∧ ¬ 𝑦 ∈ V)} | |
9 | 7, 8 | eqtri 2844 | . . . . . 6 ⊢ ∅ = {𝑦 ∣ (𝑦 ∈ V ∧ ¬ 𝑦 ∈ V)} |
10 | 9 | eleq2i 2904 | . . . . 5 ⊢ (𝑥 ∈ ∅ ↔ 𝑥 ∈ {𝑦 ∣ (𝑦 ∈ V ∧ ¬ 𝑦 ∈ V)}) |
11 | 6, 10 | mtbir 325 | . . . 4 ⊢ ¬ 𝑥 ∈ ∅ |
12 | 11 | intnan 489 | . . 3 ⊢ ¬ (𝑥 = 𝐴 ∧ 𝑥 ∈ ∅) |
13 | 12 | nex 1801 | . 2 ⊢ ¬ ∃𝑥(𝑥 = 𝐴 ∧ 𝑥 ∈ ∅) |
14 | dfclel 2894 | . 2 ⊢ (𝐴 ∈ ∅ ↔ ∃𝑥(𝑥 = 𝐴 ∧ 𝑥 ∈ ∅)) | |
15 | 13, 14 | mtbir 325 | 1 ⊢ ¬ 𝐴 ∈ ∅ |
Colors of variables: wff setvar class |
Syntax hints: ¬ wn 3 ∧ wa 398 = wceq 1537 ∃wex 1780 [wsb 2069 ∈ wcel 2114 {cab 2799 Vcvv 3494 ∖ cdif 3933 ∅c0 4291 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1970 ax-7 2015 ax-8 2116 ax-9 2124 ax-ext 2793 |
This theorem depends on definitions: df-bi 209 df-an 399 df-ex 1781 df-sb 2070 df-clab 2800 df-cleq 2814 df-clel 2893 df-dif 3939 df-nul 4292 |
This theorem is referenced by: nel02 4298 n0i 4299 eq0f 4305 rex0 4317 rab0 4337 un0 4344 in0 4345 0ss 4350 sbcel12 4360 sbcel2 4367 disj 4399 r19.2zb 4441 ral0 4456 rabsnifsb 4658 iun0 4985 br0 5115 0xp 5649 csbxp 5650 dm0 5790 dm0rn0 5795 reldm0 5798 elimasni 5956 co02 6113 ord0eln0 6245 nlim0 6249 nsuceq0 6271 dffv3 6666 0fv 6709 elfv2ex 6711 mpo0 7239 el2mpocsbcl 7780 bropopvvv 7785 bropfvvvv 7787 tz7.44-2 8043 omordi 8192 nnmordi 8257 omabs 8274 omsmolem 8280 0er 8326 omxpenlem 8618 en3lp 9077 cantnfle 9134 r1sdom 9203 r1pwss 9213 alephordi 9500 axdc3lem2 9873 zorn2lem7 9924 nlt1pi 10328 xrinf0 12732 elixx3g 12752 elfz2 12900 fzm1 12988 om2uzlti 13319 hashf1lem2 13815 sum0 15078 fsumsplit 15097 sumsplit 15123 fsum2dlem 15125 prod0 15297 fprod2dlem 15334 sadc0 15803 sadcp1 15804 saddisjlem 15813 smu01lem 15834 smu01 15835 smu02 15836 lcmf0 15978 prmreclem5 16256 vdwap0 16312 ram0 16358 0catg 16958 oduclatb 17754 0g0 17874 dfgrp2e 18129 cntzrcl 18457 pmtrfrn 18586 psgnunilem5 18622 gexdvds 18709 gsumzsplit 19047 dprdcntz2 19160 00lss 19713 mplcoe1 20246 mplcoe5 20249 00ply1bas 20408 dsmmfi 20882 maducoeval2 21249 madugsum 21252 0ntop 21513 haust1 21960 hauspwdom 22109 kqcldsat 22341 tsmssplit 22760 ustn0 22829 0met 22976 itg11 24292 itg0 24380 bddmulibl 24439 fsumharmonic 25589 ppiublem2 25779 lgsdir2lem3 25903 uvtx01vtx 27179 vtxdg0v 27255 0enwwlksnge1 27642 rusgr0edg 27752 clwwlk 27761 eupth2lem1 27997 helloworld 28244 topnfbey 28248 n0lpligALT 28261 ccatf1 30625 isarchi 30811 measvuni 31473 ddemeas 31495 sibf0 31592 signstfvneq0 31842 opelco3 33018 wsuclem 33112 unbdqndv1 33847 bj-projval 34311 bj-df-nul 34351 bj-nuliota 34353 bj-0nmoore 34407 nlpineqsn 34692 poimirlem30 34937 pw2f1ocnv 39683 areaquad 39872 eu0 39935 ntrneikb 40493 r1rankcld 40616 en3lpVD 41228 supminfxr 41789 liminf0 42123 iblempty 42299 stoweidlem34 42368 sge00 42707 vonhoire 43003 prprelprb 43728 fpprbasnn 43943 |
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