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| Mirrors > Home > ILE Home > Th. List > eldifsni | GIF version | ||
| Description: Membership in a set with an element removed. (Contributed by NM, 10-Mar-2015.) |
| Ref | Expression |
|---|---|
| eldifsni | ⊢ (𝐴 ∈ (𝐵 ∖ {𝐶}) → 𝐴 ≠ 𝐶) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | eldifsn 3798 | . 2 ⊢ (𝐴 ∈ (𝐵 ∖ {𝐶}) ↔ (𝐴 ∈ 𝐵 ∧ 𝐴 ≠ 𝐶)) | |
| 2 | 1 | simprbi 275 | 1 ⊢ (𝐴 ∈ (𝐵 ∖ {𝐶}) → 𝐴 ≠ 𝐶) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 ∈ wcel 2200 ≠ wne 2400 ∖ cdif 3195 {csn 3667 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-in1 617 ax-in2 618 ax-io 714 ax-5 1493 ax-7 1494 ax-gen 1495 ax-ie1 1539 ax-ie2 1540 ax-8 1550 ax-10 1551 ax-11 1552 ax-i12 1553 ax-bndl 1555 ax-4 1556 ax-17 1572 ax-i9 1576 ax-ial 1580 ax-i5r 1581 ax-ext 2211 |
| This theorem depends on definitions: df-bi 117 df-tru 1398 df-nf 1507 df-sb 1809 df-clab 2216 df-cleq 2222 df-clel 2225 df-nfc 2361 df-ne 2401 df-v 2802 df-dif 3200 df-sn 3673 |
| This theorem is referenced by: neldifsn 3801 suppssfv 6226 suppssov1 6227 elfi2 7162 fiuni 7168 fifo 7170 en2other2 7397 oddprm 12822 ringelnzr 14191 lgslem1 15719 lgseisenlem2 15790 lgseisenlem4 15792 lgseisen 15793 lgsquadlem1 15796 lgsquad2 15802 m1lgs 15804 |
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