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Mirrors > Home > MPE Home > Th. List > n0i | Structured version Visualization version GIF version |
Description: If a set has elements, then it is not empty. (Contributed by NM, 31-Dec-1993.) |
Ref | Expression |
---|---|
n0i | ⊢ (𝐵 ∈ 𝐴 → ¬ 𝐴 = ∅) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | noel 3878 | . . 3 ⊢ ¬ 𝐵 ∈ ∅ | |
2 | eleq2 2677 | . . 3 ⊢ (𝐴 = ∅ → (𝐵 ∈ 𝐴 ↔ 𝐵 ∈ ∅)) | |
3 | 1, 2 | mtbiri 316 | . 2 ⊢ (𝐴 = ∅ → ¬ 𝐵 ∈ 𝐴) |
4 | 3 | con2i 133 | 1 ⊢ (𝐵 ∈ 𝐴 → ¬ 𝐴 = ∅) |
Colors of variables: wff setvar class |
Syntax hints: ¬ wn 3 → wi 4 = wceq 1475 ∈ wcel 1977 ∅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: ne0i 3880 n0ii 3881 oprcl 4365 disjss3 4582 mptrcl 6198 isomin 6487 ovrcl 6584 oalimcl 7527 omlimcl 7545 oaabs2 7612 ecexr 7634 elpmi 7762 elmapex 7764 pmresg 7771 pmsspw 7778 ixpssmap2g 7823 ixpssmapg 7824 resixpfo 7832 php3 8031 cantnfp1lem2 8459 cantnflem1 8469 cnfcom2lem 8481 rankxplim2 8626 rankxplim3 8627 cardlim 8681 alephnbtwn 8777 ttukeylem5 9218 r1wunlim 9438 ssnn0fi 12646 ruclem13 14810 ramtub 15554 elbasfv 15748 elbasov 15749 restsspw 15915 homarcl 16501 grpidval 17083 odlem2 17781 efgrelexlema 17985 subcmn 18065 dvdsrval 18468 pf1rcl 19534 elocv 19831 matrcl 20037 0top 20598 ppttop 20621 pptbas 20622 restrcl 20771 ssrest 20790 iscnp2 20853 lmmo 20994 zfbas 21510 rnelfmlem 21566 isfcls 21623 isnghm 22337 iscau2 22883 itg2cnlem1 23334 itgsubstlem 23615 dchrrcl 24765 eleenn 25576 nbgranself2 25965 uvtxisvtx 26018 uvtx01vtx 26020 2spot0 26591 eulerpartlemgvv 29765 indispcon 30470 cvmtop1 30496 cvmtop2 30497 mrsub0 30667 mrsubf 30668 mrsubccat 30669 mrsubcn 30670 mrsubco 30672 mrsubvrs 30673 msubf 30683 mclsrcl 30712 funpartlem 31219 tailfb 31542 atbase 33594 llnbase 33813 lplnbase 33838 lvolbase 33882 osumcllem4N 34263 pexmidlem1N 34274 lhpbase 34302 mapco2g 36295 wepwsolem 36630 uneqsn 37341 ssfiunibd 38464 hoicvr 39438 |
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