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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 4096 | . 2 ⊢ (𝐴 ∈ (𝐵 ∩ 𝐶) ↔ (𝐴 ∈ 𝐵 ∧ 𝐴 ∈ 𝐶)) | |
| 2 | ne0i 4290 | . 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 2146 ≠ wne 2959 ∩ cin 4092 ∅c0 4281 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1827 ax-4 1841 ax-5 1944 ax-6 2001 ax-7 2042 ax-8 2148 ax-9 2156 ax-ext 2735 |
| This proof depends on definitions: df-bi 210 df-an 402 df-tru 1572 df-fal 1582 df-ex 1812 df-sb 2101 df-clab 2742 df-cleq 2755 df-clel 2839 df-ne 2960 df-v 3456 df-dif 4050 df-in 4094 df-nul 4282 |
| This theorem is used by: minel 4422 disji 5091 disjiun 5094 onnseq 8366 uniinqs 8832 en3lplem1 9626 cplem1 9963 cplem1OLD 9964 fpwwe2lem11 10739 limsupgre 15663 cat1lem 18286 lmcls 23635 conncn 23759 iunconnlem 23760 conncompclo 23768 2ndcsep 23793 lfinpfin 23858 locfincmp 23860 txcls 23938 pthaus 23972 qtopeu 24050 trfbas2 24177 filss 24187 zfbas 24230 fmfnfm 24292 tsmsfbas 24462 restmetu 24904 qdensere 25103 reperflem 25153 reconnlem1 25161 metds0 25185 metnrmlem1a 25193 minveclem3b 25764 ovolicc2lem5 25857 taylfval 26701 prlnghpg 29439 wlk1walk 30234 wwlksm1edg 30485 disjif 33229 disjif2 33232 dfufd2lem 34137 subfacp1lem6 36074 erdszelem5 36084 pconnconn 36120 cvmseu 36165 neibastop2lem 37281 topdifinffinlem 38416 sstotbnd3 38856 brtrclfv2 44873 corcltrcl 44885 disjinfi 46352 |
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