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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 4295 | . 2 ⊢ (𝐴 ∈ (𝐵 ∩ 𝐶) → (𝐵 ∩ 𝐶) ≠ ∅) | |
| 3 | 1, 2 | sylbir 237 | 1 ⊢ ((𝐴 ∈ 𝐵 ∧ 𝐴 ∈ 𝐶) → (𝐵 ∩ 𝐶) ≠ ∅) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∧ wa 399 ∈ wcel 2144 ≠ wne 2959 ∩ cin 3905 ∅c0 4287 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1817 ax-4 1831 ax-5 1932 ax-6 1989 ax-7 2030 ax-8 2146 ax-9 2154 ax-ext 2736 |
| This theorem depends on definitions: df-bi 209 df-an 400 df-tru 1565 df-fal 1575 df-ex 1802 df-sb 2093 df-clab 2743 df-cleq 2756 df-clel 2839 df-ne 2960 df-v 3458 df-dif 3909 df-in 3913 df-nul 4288 |
| This theorem is referenced by: minel 4422 disji 5087 disjiun 5090 onnseq 8317 uniinqs 8781 en3lplem1 9569 cplem1 9849 fpwwe2lem11 10601 limsupgre 15510 cat1lem 18131 lmcls 23364 conncn 23488 iunconnlem 23489 conncompclo 23497 2ndcsep 23521 lfinpfin 23586 locfincmp 23588 txcls 23666 pthaus 23700 qtopeu 23778 trfbas2 23905 filss 23915 zfbas 23958 fmfnfm 24020 tsmsfbas 24190 restmetu 24632 qdensere 24831 reperflem 24881 reconnlem1 24889 metds0 24913 metnrmlem1a 24921 minveclem3b 25492 ovolicc2lem5 25585 taylfval 26424 wlk1walk 29841 wwlksm1edg 30083 disjif 32780 disjif2 32783 dfufd2lem 33747 subfacp1lem6 35540 erdszelem5 35550 pconnconn 35586 cvmseu 35631 neibastop2lem 36725 topdifinffinlem 37846 sstotbnd3 38280 brtrclfv2 44308 corcltrcl 44320 disjinfi 45775 |
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