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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 4169 | . 2 ⊢ (𝐴 ∈ (𝐵 ∩ 𝐶) ↔ (𝐴 ∈ 𝐵 ∧ 𝐴 ∈ 𝐶)) | |
2 | ne0i 4300 | . 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 398 ∈ wcel 2114 ≠ wne 3016 ∩ cin 3935 ∅c0 4291 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1970 ax-7 2015 ax-8 2116 ax-9 2124 ax-10 2145 ax-11 2161 ax-12 2177 ax-ext 2793 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-tru 1540 df-ex 1781 df-nf 1785 df-sb 2070 df-clab 2800 df-cleq 2814 df-clel 2893 df-nfc 2963 df-ne 3017 df-v 3496 df-dif 3939 df-in 3943 df-nul 4292 |
This theorem is referenced by: minel 4415 disji 5049 disjiun 5053 onnseq 7981 uniinqs 8377 en3lplem1 9075 cplem1 9318 fpwwe2lem12 10063 limsupgre 14838 lmcls 21910 conncn 22034 iunconnlem 22035 conncompclo 22043 2ndcsep 22067 lfinpfin 22132 locfincmp 22134 txcls 22212 pthaus 22246 qtopeu 22324 trfbas2 22451 filss 22461 zfbas 22504 fmfnfm 22566 tsmsfbas 22736 restmetu 23180 qdensere 23378 reperflem 23426 reconnlem1 23434 metds0 23458 metnrmlem1a 23466 minveclem3b 24031 ovolicc2lem5 24122 taylfval 24947 wlk1walk 27420 wwlksm1edg 27659 disjif 30328 disjif2 30331 subfacp1lem6 32432 erdszelem5 32442 pconnconn 32478 cvmseu 32523 neibastop2lem 33708 topdifinffinlem 34631 sstotbnd3 35069 brtrclfv2 40092 corcltrcl 40104 disjinfi 41474 |
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