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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 3915 | . 2 ⊢ (𝐴 ∈ (𝐵 ∩ 𝐶) ↔ (𝐴 ∈ 𝐵 ∧ 𝐴 ∈ 𝐶)) | |
| 2 | ne0i 4287 | . 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 2145 ≠ wne 2955 ∩ cin 3898 ∅c0 4279 |
| 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 2147 ax-9 2155 ax-ext 2732 |
| 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 2739 df-cleq 2752 df-clel 2835 df-ne 2956 df-v 3452 df-dif 3902 df-in 3906 df-nul 4280 |
| This theorem is used by: minel 4419 disji 5088 disjiun 5091 onnseq 8334 uniinqs 8800 en3lplem1 9594 cplem1 9892 cplem1OLD 9893 fpwwe2lem11 10653 limsupgre 15571 cat1lem 18188 lmcls 23530 conncn 23654 iunconnlem 23655 conncompclo 23663 2ndcsep 23688 lfinpfin 23753 locfincmp 23755 txcls 23833 pthaus 23867 qtopeu 23945 trfbas2 24072 filss 24082 zfbas 24125 fmfnfm 24187 tsmsfbas 24357 restmetu 24799 qdensere 24998 reperflem 25048 reconnlem1 25056 metds0 25080 metnrmlem1a 25088 minveclem3b 25659 ovolicc2lem5 25752 taylfval 26598 prlnghpg 29306 wlk1walk 30101 wwlksm1edg 30352 disjif 33054 disjif2 33057 dfufd2lem 33962 subfacp1lem6 35767 erdszelem5 35777 pconnconn 35813 cvmseu 35858 neibastop2lem 36982 topdifinffinlem 38104 sstotbnd3 38529 brtrclfv2 44570 corcltrcl 44582 disjinfi 46027 |
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