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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 3905 | . 2 ⊢ (𝐴 ∈ (𝐵 ∩ 𝐶) ↔ (𝐴 ∈ 𝐵 ∧ 𝐴 ∈ 𝐶)) | |
| 2 | ne0i 4281 | . 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 2932 ∩ cin 3888 ∅c0 4273 |
| 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 2708 |
| 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 2715 df-cleq 2728 df-clel 2811 df-ne 2933 df-v 3431 df-dif 3892 df-in 3896 df-nul 4274 |
| This theorem is referenced by: minel 4406 disji 5070 disjiun 5073 onnseq 8284 uniinqs 8744 en3lplem1 9533 cplem1 9813 fpwwe2lem11 10564 limsupgre 15443 cat1lem 18063 lmcls 23267 conncn 23391 iunconnlem 23392 conncompclo 23400 2ndcsep 23424 lfinpfin 23489 locfincmp 23491 txcls 23569 pthaus 23603 qtopeu 23681 trfbas2 23808 filss 23818 zfbas 23861 fmfnfm 23923 tsmsfbas 24093 restmetu 24535 qdensere 24734 reperflem 24784 reconnlem1 24792 metds0 24816 metnrmlem1a 24824 minveclem3b 25395 ovolicc2lem5 25488 taylfval 26324 wlk1walk 29707 wwlksm1edg 29949 disjif 32648 disjif2 32651 dfufd2lem 33609 subfacp1lem6 35367 erdszelem5 35377 pconnconn 35413 cvmseu 35458 neibastop2lem 36542 topdifinffinlem 37663 sstotbnd3 38097 brtrclfv2 44154 corcltrcl 44166 disjinfi 45622 |
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