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Mirrors > Home > ILE Home > Th. List > neldifsnd | GIF version |
Description: 𝐴 is not in (𝐵 ∖ {𝐴}). Deduction form. (Contributed by David Moews, 1-May-2017.) |
Ref | Expression |
---|---|
neldifsnd | ⊢ (𝜑 → ¬ 𝐴 ∈ (𝐵 ∖ {𝐴})) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | neldifsn 3570 | . 2 ⊢ ¬ 𝐴 ∈ (𝐵 ∖ {𝐴}) | |
2 | 1 | a1i 9 | 1 ⊢ (𝜑 → ¬ 𝐴 ∈ (𝐵 ∖ {𝐴})) |
Colors of variables: wff set class |
Syntax hints: ¬ wn 3 → wi 4 ∈ wcel 1438 ∖ cdif 2996 {csn 3446 |
This theorem was proved from axioms: ax-1 5 ax-2 6 ax-mp 7 ax-ia1 104 ax-ia2 105 ax-ia3 106 ax-in1 579 ax-in2 580 ax-io 665 ax-5 1381 ax-7 1382 ax-gen 1383 ax-ie1 1427 ax-ie2 1428 ax-8 1440 ax-10 1441 ax-11 1442 ax-i12 1443 ax-bndl 1444 ax-4 1445 ax-17 1464 ax-i9 1468 ax-ial 1472 ax-i5r 1473 ax-ext 2070 |
This theorem depends on definitions: df-bi 115 df-tru 1292 df-nf 1395 df-sb 1693 df-clab 2075 df-cleq 2081 df-clel 2084 df-nfc 2217 df-ne 2256 df-v 2621 df-dif 3001 df-sn 3452 |
This theorem is referenced by: difsnb 3580 frirrg 4177 elirr 4357 |
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