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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 3796 | . 2 ⊢ (𝐴 ∈ (𝐵 ∩ 𝐶) ↔ (𝐴 ∈ 𝐵 ∧ 𝐴 ∈ 𝐶)) | |
2 | ne0i 3921 | . 2 ⊢ (𝐴 ∈ (𝐵 ∩ 𝐶) → (𝐵 ∩ 𝐶) ≠ ∅) | |
3 | 1, 2 | sylbir 225 | 1 ⊢ ((𝐴 ∈ 𝐵 ∧ 𝐴 ∈ 𝐶) → (𝐵 ∩ 𝐶) ≠ ∅) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∧ wa 384 ∈ wcel 1990 ≠ wne 2794 ∩ cin 3573 ∅c0 3915 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1722 ax-4 1737 ax-5 1839 ax-6 1888 ax-7 1935 ax-9 1999 ax-10 2019 ax-11 2034 ax-12 2047 ax-13 2246 ax-ext 2602 |
This theorem depends on definitions: df-bi 197 df-or 385 df-an 386 df-tru 1486 df-ex 1705 df-nf 1710 df-sb 1881 df-clab 2609 df-cleq 2615 df-clel 2618 df-nfc 2753 df-ne 2795 df-v 3202 df-dif 3577 df-in 3581 df-nul 3916 |
This theorem is referenced by: minel 4033 minelOLD 4034 disji 4637 disjiun 4640 onnseq 7441 uniinqs 7827 en3lplem1 8511 cplem1 8752 fpwwe2lem12 9463 limsupgre 14212 lmcls 21106 conncn 21229 iunconnlem 21230 conncompclo 21238 2ndcsep 21262 lfinpfin 21327 locfincmp 21329 txcls 21407 pthaus 21441 qtopeu 21519 trfbas2 21647 filss 21657 zfbas 21700 fmfnfm 21762 tsmsfbas 21931 restmetu 22375 qdensere 22573 reperflem 22621 reconnlem1 22629 metds0 22653 metnrmlem1a 22661 minveclem3b 23199 ovolicc2lem5 23289 taylfval 24113 wlk1walk 26535 wwlksm1edg 26767 disjif 29391 disjif2 29394 subfacp1lem6 31167 erdszelem5 31177 pconnconn 31213 cvmseu 31258 neibastop2lem 32355 topdifinffinlem 33195 sstotbnd3 33575 brtrclfv2 38019 corcltrcl 38031 disjinfi 39380 |
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