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| Mirrors > Home > ILE Home > Th. List > eldifn | GIF version | ||
| Description: Implication of membership in a class difference. (Contributed by NM, 3-May-1994.) |
| Ref | Expression |
|---|---|
| eldifn | ⊢ (𝐴 ∈ (𝐵 ∖ 𝐶) → ¬ 𝐴 ∈ 𝐶) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | eldif 3210 | . 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: ¬ wn 3 → wi 4 ∈ wcel 2202 ∖ cdif 3198 |
| 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 2213 |
| This theorem depends on definitions: df-bi 117 df-tru 1401 df-nf 1510 df-sb 1811 df-clab 2218 df-cleq 2224 df-clel 2227 df-nfc 2364 df-v 2805 df-dif 3203 |
| This theorem is referenced by: elndif 3333 unssin 3448 inssun 3449 noel 3500 disjel 3551 undifexmid 4289 exmidundif 4302 exmidundifim 4303 exmid1stab 4304 phpm 7095 undifdcss 7158 fsum3cvg 12002 summodclem2a 12005 fisumss 12016 isumss2 12017 binomlem 12107 fproddccvg 12196 prodmodclem2a 12200 fprodssdc 12214 fprodsplitdc 12220 ply1termlem 15536 plyaddlem1 15541 plymullem1 15542 plycoeid3 15551 dvply1 15559 |
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