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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 2939 | . 2 ⊢ ¬ 𝐴 ≠ 𝐴 | |
| 2 | eldifsni 4744 | . 2 ⊢ (𝐴 ∈ (𝐵 ∖ {𝐴}) → 𝐴 ≠ 𝐴) | |
| 3 | 1, 2 | mto 197 | 1 ⊢ ¬ 𝐴 ∈ (𝐵 ∖ {𝐴}) |
| Colors of variables: wff setvar class |
| Syntax hints: ¬ wn 3 ∈ wcel 2113 ≠ wne 2930 ∖ cdif 3896 {csn 4578 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1968 ax-7 2009 ax-8 2115 ax-9 2123 ax-ext 2706 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-tru 1544 df-ex 1781 df-sb 2068 df-clab 2713 df-cleq 2726 df-clel 2809 df-ne 2931 df-v 3440 df-dif 3902 df-sn 4579 |
| This theorem is referenced by: neldifsnd 4747 fofinf1o 9230 dfac9 10045 1div0 11794 xrsupss 13222 hashgt23el 14345 fvsetsid 17093 islbs3 21108 islindf4 21791 ufinffr 23871 i1fd 25636 finsumvtxdg2sstep 29572 matunitlindflem1 37756 poimirlem25 37785 itg2addnclem 37811 itg2addnclem2 37812 prter2 39080 |
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