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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 3919 | . 2 ⊢ (𝐴 ∈ (𝐵 ∩ 𝐶) ↔ (𝐴 ∈ 𝐵 ∧ 𝐴 ∈ 𝐶)) | |
| 2 | ne0i 4295 | . 2 ⊢ (𝐴 ∈ (𝐵 ∩ 𝐶) → (𝐵 ∩ 𝐶) ≠ ∅) | |
| 3 | 1, 2 | sylbir 235 | 1 ⊢ ((𝐴 ∈ 𝐵 ∧ 𝐴 ∈ 𝐶) → (𝐵 ∩ 𝐶) ≠ ∅) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∧ wa 395 ∈ wcel 2114 ≠ wne 2933 ∩ cin 3902 ∅c0 4287 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1912 ax-6 1969 ax-7 2010 ax-8 2116 ax-9 2124 ax-ext 2709 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-tru 1545 df-fal 1555 df-ex 1782 df-sb 2069 df-clab 2716 df-cleq 2729 df-clel 2812 df-ne 2934 df-v 3444 df-dif 3906 df-in 3910 df-nul 4288 |
| This theorem is referenced by: minel 4420 disji 5085 disjiun 5088 onnseq 8288 uniinqs 8748 en3lplem1 9535 cplem1 9815 fpwwe2lem11 10566 limsupgre 15418 cat1lem 18034 lmcls 23263 conncn 23387 iunconnlem 23388 conncompclo 23396 2ndcsep 23420 lfinpfin 23485 locfincmp 23487 txcls 23565 pthaus 23599 qtopeu 23677 trfbas2 23804 filss 23814 zfbas 23857 fmfnfm 23919 tsmsfbas 24089 restmetu 24531 qdensere 24730 reperflem 24780 reconnlem1 24788 metds0 24812 metnrmlem1a 24820 minveclem3b 25401 ovolicc2lem5 25495 taylfval 26339 wlk1walk 29730 wwlksm1edg 29972 disjif 32671 disjif2 32674 dfufd2lem 33648 subfacp1lem6 35407 erdszelem5 35417 pconnconn 35453 cvmseu 35498 neibastop2lem 36582 topdifinffinlem 37629 sstotbnd3 38056 brtrclfv2 44112 corcltrcl 44124 disjinfi 45580 |
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