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| Mirrors > Home > MPE Home > Th. List > neldifsn | Structured version Visualization version GIF version | ||
| Description: The class 𝐴 is not in (𝐵 ∖ {𝐴}). (Contributed by David Moews, 1-May-2017.) |
| Ref | Expression |
|---|---|
| neldifsn | ⊢ ¬ 𝐴 ∈ (𝐵 ∖ {𝐴}) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | neirr 2967 | . 2 ⊢ ¬ 𝐴 ≠ 𝐴 | |
| 2 | eldifsni 4752 | . 2 ⊢ (𝐴 ∈ (𝐵 ∖ {𝐴}) → 𝐴 ≠ 𝐴) | |
| 3 | 1, 2 | mto 200 | 1 ⊢ ¬ 𝐴 ∈ (𝐵 ∖ {𝐴}) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: ¬ wn 3 ∈ wcel 2146 ≠ wne 2958 ∖ cdif 4047 {csn 4587 |
| 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-ex 1812 df-sb 2101 df-clab 2742 df-cleq 2755 df-clel 2838 df-ne 2959 df-v 3455 df-dif 4049 df-sn 4588 |
| This theorem is used by: neldifsnd 4755 fofinf1o 9332 dfac9 10225 1div0 11985 xrsupss 13449 hashgt23el 14579 fvsetsid 17358 islbs3 21445 islindf4 22156 matunitlindflem1 23006 ufinffr 24260 i1fd 26014 finsumvtxdg2sstep 30142 poimirlem25 38703 itg2addnclem 38729 itg2addnclem2 38730 prter2 40078 |
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