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| Mirrors > Home > MPE Home > Th. List > inelcm | Structured version Visualization version GIF version | ||
| Description: The intersection of classes with a common member is nonempty. (Contributed by NM, 7-Apr-1994.) |
| Ref | Expression |
|---|---|
| inelcm | ⊢ ((𝐴 ∈ 𝐵 ∧ 𝐴 ∈ 𝐶) → (𝐵 ∩ 𝐶) ≠ ∅) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | elin 3922 | . 2 ⊢ (𝐴 ∈ (𝐵 ∩ 𝐶) ↔ (𝐴 ∈ 𝐵 ∧ 𝐴 ∈ 𝐶)) | |
| 2 | ne0i 4294 | . 2 ⊢ (𝐴 ∈ (𝐵 ∩ 𝐶) → (𝐵 ∩ 𝐶) ≠ ∅) | |
| 3 | 1, 2 | sylbir 238 | 1 ⊢ ((𝐴 ∈ 𝐵 ∧ 𝐴 ∈ 𝐶) → (𝐵 ∩ 𝐶) ≠ ∅) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ∧ wa 401 ∈ wcel 2146 ≠ wne 2960 ∩ cin 3905 ∅c0 4286 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1943 ax-6 2000 ax-7 2041 ax-8 2148 ax-9 2156 ax-ext 2737 |
| This proof depends on definitions: df-bi 210 df-an 402 df-tru 1573 df-fal 1583 df-ex 1813 df-sb 2100 df-clab 2744 df-cleq 2757 df-clel 2840 df-ne 2961 df-v 3459 df-dif 3909 df-in 3913 df-nul 4287 |
| This theorem is used by: minel 4426 disji 5096 disjiun 5099 onnseq 8337 uniinqs 8801 en3lplem1 9588 cplem1 9886 cplem1OLD 9887 fpwwe2lem11 10645 limsupgre 15560 cat1lem 18179 lmcls 23513 conncn 23637 iunconnlem 23638 conncompclo 23646 2ndcsep 23671 lfinpfin 23736 locfincmp 23738 txcls 23816 pthaus 23850 qtopeu 23928 trfbas2 24055 filss 24065 zfbas 24108 fmfnfm 24170 tsmsfbas 24340 restmetu 24782 qdensere 24981 reperflem 25031 reconnlem1 25039 metds0 25063 metnrmlem1a 25071 minveclem3b 25642 ovolicc2lem5 25735 taylfval 26577 prlnghpg 29255 wlk1walk 30050 wwlksm1edg 30301 disjif 32998 disjif2 33001 dfufd2lem 33907 subfacp1lem6 35718 erdszelem5 35728 pconnconn 35764 cvmseu 35809 neibastop2lem 36932 topdifinffinlem 38054 sstotbnd3 38489 brtrclfv2 44530 corcltrcl 44542 disjinfi 45987 |
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