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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 3825 | . 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 2205 ≠ wne 2414 ∖ cdif 3211 {csn 3694 |
| 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 619 ax-in2 620 ax-io 717 ax-5 1496 ax-7 1497 ax-gen 1498 ax-ie1 1542 ax-ie2 1543 ax-8 1553 ax-10 1554 ax-11 1555 ax-i12 1556 ax-bndl 1558 ax-4 1559 ax-17 1575 ax-i9 1579 ax-ial 1583 ax-i5r 1584 ax-ext 2216 |
| This theorem depends on definitions: df-bi 117 df-tru 1401 df-nf 1510 df-sb 1812 df-clab 2221 df-cleq 2227 df-clel 2230 df-nfc 2375 df-ne 2415 df-v 2817 df-dif 3216 df-sn 3700 |
| This theorem is referenced by: neldifsn 3828 suppssov1 6272 suppssfvg 6476 elfi2 7272 fiuni 7278 fifo 7280 en2other2 7512 oddprm 12985 ringelnzr 14435 lgslem1 16002 lgseisenlem2 16073 lgseisenlem4 16075 lgseisen 16076 lgsquadlem1 16079 lgsquad2 16085 m1lgs 16087 |
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