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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 2885 | . 2 ⊢ ((𝐴 ∈ 𝐵 ∧ ¬ 𝐴 ∈ 𝐶) → ¬ 𝐵 = 𝐶) | |
| 2 | 1 | neqned 2962 | 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 2144 ≠ wne 2955 |
| 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 1942 ax-6 1999 ax-7 2040 ax-8 2146 ax-9 2154 ax-ext 2732 |
| This proof depends on definitions: df-bi 210 df-an 402 df-ex 1812 df-cleq 2752 df-clel 2835 df-ne 2956 |
| This theorem is used by: elnelne1 3072 difsnb 4768 fofinf1o 9321 fin23lem24 10400 fin23lem31 10421 ttukeylem7 10593 npomex 11081 drnglidl1ne0 20769 lbspss 21357 islbs3 21433 lbsextlem4 21439 ssdifidlprm 21642 obslbs 22036 hauspwpwf1 24306 ppiltx 27504 tglineneq 29113 lnopp2hpgb 29241 colopp 29247 plngrotlem1 29265 plngrotlem2 29266 lnssplnglem 29269 tgaaddcpbllem1 29349 tgaaddcpbl 29352 prlngmolem1 29430 prlngmolem2 29431 quadcgrprlng 29444 ex-pss 31029 drngidlhash 33983 mxidlmaxv 33993 mxidlprm 33995 drng0mxidl 34000 qsdrnglem2 34020 dflringlem3 34028 dflring3 34029 dflring4 34030 rsprprmprmidl 34054 1arithufdlem4 34079 ply1annnr 34335 irngnminplynz 34344 algextdeglem4 34352 unelldsys 34791 cntnevol 34861 fin2solem 38530 lshpnelb 40042 osumcllem10N 41023 pexmidlem7N 41034 dochsnkrlem1 42527 ricdrng1 43593 rpnnen3lem 44038 lvecpsslmod 49619 |
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