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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 3921 | . 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 400 ∈ wcel 2143 ≠ wne 2958 ∩ cin 3904 ∅c0 4286 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1825 ax-4 1839 ax-5 1940 ax-6 1997 ax-7 2038 ax-8 2145 ax-9 2153 ax-ext 2735 |
| This proof depends on definitions: df-bi 210 df-an 401 df-tru 1573 df-fal 1583 df-ex 1810 df-sb 2097 df-clab 2742 df-cleq 2755 df-clel 2838 df-ne 2959 df-v 3457 df-dif 3908 df-in 3912 df-nul 4287 |
| This theorem is used by: minel 4426 disji 5094 disjiun 5097 onnseq 8327 uniinqs 8791 en3lplem1 9577 cplem1 9875 cplem1OLD 9876 fpwwe2lem11 10630 limsupgre 15537 cat1lem 18157 lmcls 23468 conncn 23592 iunconnlem 23593 conncompclo 23601 2ndcsep 23625 lfinpfin 23690 locfincmp 23692 txcls 23770 pthaus 23804 qtopeu 23882 trfbas2 24009 filss 24019 zfbas 24062 fmfnfm 24124 tsmsfbas 24294 restmetu 24736 qdensere 24935 reperflem 24985 reconnlem1 24993 metds0 25017 metnrmlem1a 25025 minveclem3b 25596 ovolicc2lem5 25689 taylfval 26531 prlnghpg 29205 wlk1walk 29997 wwlksm1edg 30239 disjif 32932 disjif2 32935 dfufd2lem 33848 subfacp1lem6 35685 erdszelem5 35695 pconnconn 35731 cvmseu 35776 neibastop2lem 36899 topdifinffinlem 38021 sstotbnd3 38455 brtrclfv2 44481 corcltrcl 44493 disjinfi 45938 |
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