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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 2965 | . 2 ⊢ ¬ 𝐴 ≠ 𝐴 | |
| 2 | eldifsni 4753 | . 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 2145 ≠ wne 2956 ∖ cdif 3896 {csn 4584 |
| 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 1943 ax-6 2000 ax-7 2041 ax-8 2147 ax-9 2155 ax-ext 2733 |
| This proof depends on definitions: df-bi 210 df-an 402 df-tru 1573 df-ex 1813 df-sb 2100 df-clab 2740 df-cleq 2753 df-clel 2836 df-ne 2957 df-v 3453 df-dif 3902 df-sn 4585 |
| This theorem is used by: neldifsnd 4756 fofinf1o 9321 dfac9 10215 1div0 11975 xrsupss 13439 hashgt23el 14569 fvsetsid 17346 islbs3 21433 islindf4 22144 matunitlindflem1 22994 ufinffr 24248 i1fd 26002 finsumvtxdg2sstep 30130 poimirlem25 38563 itg2addnclem 38589 itg2addnclem2 38590 prter2 39938 |
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