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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 2968 | . 2 ⊢ ¬ 𝐴 ≠ 𝐴 | |
| 2 | eldifsni 4755 | . 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 2147 ≠ wne 2959 ∖ cdif 4048 {csn 4588 |
| 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-tru 1573 df-ex 1813 df-sb 2102 df-clab 2742 df-cleq 2755 df-clel 2839 df-ne 2960 df-v 3456 df-dif 4050 df-sn 4589 |
| This theorem is used by: neldifsnd 4758 fofinf1o 9359 dfac9 10254 1div0 12015 xrsupss 13479 hashgt23el 14610 fvsetsid 17390 islbs3 21484 islindf4 22199 matunitlindflem1 23049 ufinffr 24303 i1fd 26057 finsumvtxdg2sstep 30187 poimirlem25 38831 itg2addnclem 38857 itg2addnclem2 38858 prter2 40204 |
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