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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 3900 | . 2 ⊢ (𝐴 ∈ (𝐵 ∩ 𝐶) ↔ (𝐴 ∈ 𝐵 ∧ 𝐴 ∈ 𝐶)) | |
| 2 | ne0i 4271 | . 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 397 ∈ wcel 2121 ≠ wne 2936 ∩ cin 3883 ∅c0 4263 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1803 ax-4 1817 ax-5 1918 ax-6 1975 ax-7 2016 ax-8 2123 ax-9 2131 ax-ext 2713 |
| This theorem depends on definitions: df-bi 209 df-an 398 df-tru 1551 df-fal 1561 df-ex 1788 df-sb 2075 df-clab 2720 df-cleq 2733 df-clel 2816 df-ne 2937 df-v 3435 df-dif 3887 df-in 3891 df-nul 4264 |
| This theorem is referenced by: minel 4396 disji 5059 disjiun 5062 onnseq 8277 uniinqs 8738 en3lplem1 9528 cplem1 9808 fpwwe2lem11 10560 limsupgre 15438 cat1lem 18058 lmcls 23288 conncn 23412 iunconnlem 23413 conncompclo 23421 2ndcsep 23445 lfinpfin 23510 locfincmp 23512 txcls 23590 pthaus 23624 qtopeu 23702 trfbas2 23829 filss 23839 zfbas 23882 fmfnfm 23944 tsmsfbas 24114 restmetu 24556 qdensere 24755 reperflem 24805 reconnlem1 24813 metds0 24837 metnrmlem1a 24845 minveclem3b 25416 ovolicc2lem5 25509 taylfval 26345 wlk1walk 29727 wwlksm1edg 29969 disjif 32669 disjif2 32672 dfufd2lem 33642 subfacp1lem6 35426 erdszelem5 35436 pconnconn 35472 cvmseu 35517 neibastop2lem 36601 topdifinffinlem 37722 sstotbnd3 38156 brtrclfv2 44184 corcltrcl 44196 disjinfi 45651 |
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