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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 3209 | . 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 3197 |
| 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 716 ax-5 1495 ax-7 1496 ax-gen 1497 ax-ie1 1541 ax-ie2 1542 ax-8 1552 ax-10 1553 ax-11 1554 ax-i12 1555 ax-bndl 1557 ax-4 1558 ax-17 1574 ax-i9 1578 ax-ial 1582 ax-i5r 1583 ax-ext 2213 |
| This theorem depends on definitions: df-bi 117 df-tru 1400 df-nf 1509 df-sb 1811 df-clab 2218 df-cleq 2224 df-clel 2227 df-nfc 2363 df-v 2804 df-dif 3202 |
| This theorem is referenced by: elndif 3331 unssin 3446 inssun 3447 noel 3498 disjel 3549 undifexmid 4283 exmidundif 4296 exmidundifim 4297 exmid1stab 4298 phpm 7051 undifdcss 7114 fsum3cvg 11938 summodclem2a 11941 fisumss 11952 isumss2 11953 binomlem 12043 fproddccvg 12132 prodmodclem2a 12136 fprodssdc 12150 fprodsplitdc 12156 ply1termlem 15465 plyaddlem1 15470 plymullem1 15471 plycoeid3 15480 dvply1 15488 |
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