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| Mirrors > Home > MPE Home > Th. List > nelne1 | Structured version Visualization version GIF version | ||
| Description: Two classes are different if they don't contain the same element. (Contributed by NM, 3-Feb-2012.) (Proof shortened by Wolf Lammen, 14-May-2023.) |
| Ref | Expression |
|---|---|
| nelne1 | ⊢ ((𝐴 ∈ 𝐵 ∧ ¬ 𝐴 ∈ 𝐶) → 𝐵 ≠ 𝐶) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | nelneq2 2889 | . 2 ⊢ ((𝐴 ∈ 𝐵 ∧ ¬ 𝐴 ∈ 𝐶) → ¬ 𝐵 = 𝐶) | |
| 2 | 1 | neqned 2966 | 1 ⊢ ((𝐴 ∈ 𝐵 ∧ ¬ 𝐴 ∈ 𝐶) → 𝐵 ≠ 𝐶) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: ¬ wn 3 → wi 4 ∧ wa 401 ∈ wcel 2147 ≠ wne 2959 |
| 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 1945 ax-6 2002 ax-7 2043 ax-8 2149 ax-9 2157 ax-ext 2735 |
| This proof depends on definitions: df-bi 210 df-an 402 df-ex 1813 df-cleq 2755 df-clel 2839 df-ne 2960 |
| This theorem is used by: elnelne1 3076 difsnb 4769 fofinf1o 9346 fin23lem24 10424 fin23lem31 10445 ttukeylem7 10617 npomex 11105 drnglidl1ne0 20796 lbspss 21384 islbs3 21460 lbsextlem4 21466 ssdifidlprm 21669 obslbs 22063 hauspwpwf1 24333 ppiltx 27531 tglineneq 29140 lnopp2hpgb 29268 colopp 29274 plngrotlem1 29292 plngrotlem2 29293 lnssplnglem 29296 tgaaddcpbllem1 29376 tgaaddcpbl 29379 prlngmolem1 29457 prlngmolem2 29458 quadcgrprlng 29471 ex-pss 31056 drngidlhash 34050 mxidlmaxv 34060 mxidlprm 34062 drng0mxidl 34067 qsdrnglem2 34087 dflringlem3 34095 dflring3 34096 dflring4 34097 rsprprmprmidl 34121 1arithufdlem4 34146 ply1annnr 34402 irngnminplynz 34411 algextdeglem4 34419 unelldsys 34858 cntnevol 34928 fin2solem 38720 lshpnelb 40232 osumcllem10N 41213 pexmidlem7N 41224 dochsnkrlem1 42717 ricdrng1 43783 rpnnen3lem 44229 lvecpsslmod 49822 |
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