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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 3915 | . 2 ⊢ (𝐴 ∈ (𝐵 ∩ 𝐶) ↔ (𝐴 ∈ 𝐵 ∧ 𝐴 ∈ 𝐶)) | |
| 2 | ne0i 4287 | . 2 ⊢ (𝐴 ∈ (𝐵 ∩ 𝐶) → (𝐵 ∩ 𝐶) ≠ ∅) | |
| 3 | 1, 2 | sylbir 238 | 1 ⊢ ((𝐴 ∈ 𝐵 ∧ 𝐴 ∈ 𝐶) → (𝐵 ∩ 𝐶) ≠ ∅) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ∧ wa 401 ∈ wcel 2145 ≠ wne 2956 ∩ cin 3898 ∅c0 4279 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1943 ax-6 2000 ax-7 2041 ax-8 2147 ax-9 2155 ax-ext 2733 |
| This proof depends on definitions: df-bi 210 df-an 402 df-tru 1573 df-fal 1583 df-ex 1813 df-sb 2100 df-clab 2740 df-cleq 2753 df-clel 2836 df-ne 2957 df-v 3453 df-dif 3902 df-in 3906 df-nul 4280 |
| This theorem is used by: minel 4419 disji 5088 disjiun 5091 onnseq 8352 uniinqs 8818 en3lplem1 9613 cplem1 9950 cplem1OLD 9951 fpwwe2lem11 10726 limsupgre 15648 cat1lem 18271 lmcls 23620 conncn 23744 iunconnlem 23745 conncompclo 23753 2ndcsep 23778 lfinpfin 23843 locfincmp 23845 txcls 23923 pthaus 23957 qtopeu 24035 trfbas2 24162 filss 24172 zfbas 24215 fmfnfm 24277 tsmsfbas 24447 restmetu 24889 qdensere 25088 reperflem 25138 reconnlem1 25146 metds0 25170 metnrmlem1a 25178 minveclem3b 25749 ovolicc2lem5 25842 taylfval 26686 prlnghpg 29424 wlk1walk 30219 wwlksm1edg 30470 disjif 33172 disjif2 33175 dfufd2lem 34081 subfacp1lem6 35950 erdszelem5 35960 pconnconn 35996 cvmseu 36041 neibastop2lem 37148 topdifinffinlem 38270 sstotbnd3 38710 brtrclfv2 44726 corcltrcl 44738 disjinfi 46206 |
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