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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 3929 | . 2 ⊢ (𝐴 ∈ (𝐵 ∩ 𝐶) ↔ (𝐴 ∈ 𝐵 ∧ 𝐴 ∈ 𝐶)) | |
| 2 | ne0i 4302 | . 2 ⊢ (𝐴 ∈ (𝐵 ∩ 𝐶) → (𝐵 ∩ 𝐶) ≠ ∅) | |
| 3 | 1, 2 | sylbir 238 | 1 ⊢ ((𝐴 ∈ 𝐵 ∧ 𝐴 ∈ 𝐶) → (𝐵 ∩ 𝐶) ≠ ∅) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∧ wa 400 ∈ wcel 2149 ≠ wne 2964 ∩ cin 3912 ∅c0 4294 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1822 ax-4 1836 ax-5 1937 ax-6 1994 ax-7 2035 ax-8 2151 ax-9 2159 ax-ext 2741 |
| This theorem depends on definitions: df-bi 210 df-an 401 df-tru 1570 df-fal 1580 df-ex 1807 df-sb 2098 df-clab 2748 df-cleq 2761 df-clel 2844 df-ne 2965 df-v 3465 df-dif 3916 df-in 3920 df-nul 4295 |
| This theorem is referenced by: minel 4432 disji 5098 disjiun 5101 onnseq 8331 uniinqs 8795 en3lplem1 9581 cplem1 9875 fpwwe2lem11 10626 limsupgre 15532 cat1lem 18153 lmcls 23428 conncn 23552 iunconnlem 23553 conncompclo 23561 2ndcsep 23585 lfinpfin 23650 locfincmp 23652 txcls 23730 pthaus 23764 qtopeu 23842 trfbas2 23969 filss 23979 zfbas 24022 fmfnfm 24084 tsmsfbas 24254 restmetu 24696 qdensere 24895 reperflem 24945 reconnlem1 24953 metds0 24977 metnrmlem1a 24985 minveclem3b 25556 ovolicc2lem5 25649 taylfval 26488 prlnghpg 29151 wlk1walk 29929 wwlksm1edg 30171 disjif 32864 disjif2 32867 dfufd2lem 33784 subfacp1lem6 35610 erdszelem5 35620 pconnconn 35656 cvmseu 35701 neibastop2lem 36794 topdifinffinlem 37915 sstotbnd3 38349 brtrclfv2 44379 corcltrcl 44391 disjinfi 45836 |
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