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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 3906 | . 2 ⊢ (𝐴 ∈ (𝐵 ∩ 𝐶) ↔ (𝐴 ∈ 𝐵 ∧ 𝐴 ∈ 𝐶)) | |
| 2 | ne0i 4282 | . 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 3889 ∅c0 4274 |
| 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 3432 df-dif 3893 df-in 3897 df-nul 4275 |
| This theorem is referenced by: minel 4407 disji 5071 disjiun 5074 onnseq 8279 uniinqs 8739 en3lplem1 9528 cplem1 9808 fpwwe2lem11 10559 limsupgre 15438 cat1lem 18058 lmcls 23281 conncn 23405 iunconnlem 23406 conncompclo 23414 2ndcsep 23438 lfinpfin 23503 locfincmp 23505 txcls 23583 pthaus 23617 qtopeu 23695 trfbas2 23822 filss 23832 zfbas 23875 fmfnfm 23937 tsmsfbas 24107 restmetu 24549 qdensere 24748 reperflem 24798 reconnlem1 24806 metds0 24830 metnrmlem1a 24838 minveclem3b 25409 ovolicc2lem5 25502 taylfval 26339 wlk1walk 29726 wwlksm1edg 29968 disjif 32667 disjif2 32670 dfufd2lem 33628 subfacp1lem6 35387 erdszelem5 35397 pconnconn 35433 cvmseu 35478 neibastop2lem 36562 topdifinffinlem 37681 sstotbnd3 38115 brtrclfv2 44176 corcltrcl 44188 disjinfi 45644 |
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