| Intuitionistic Logic Explorer |
< Previous
Next >
Nearby theorems |
||
| Mirrors > Home > ILE Home > Th. List > eq0rdv | GIF version | ||
| Description: Deduction for equality to the empty set. (Contributed by NM, 11-Jul-2014.) |
| Ref | Expression |
|---|---|
| eq0rdv.1 | ⊢ (𝜑 → ¬ 𝑥 ∈ 𝐴) |
| Ref | Expression |
|---|---|
| eq0rdv | ⊢ (𝜑 → 𝐴 = ∅) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | eq0rdv.1 | . . . 4 ⊢ (𝜑 → ¬ 𝑥 ∈ 𝐴) | |
| 2 | 1 | pm2.21d 622 | . . 3 ⊢ (𝜑 → (𝑥 ∈ 𝐴 → 𝑥 ∈ ∅)) |
| 3 | 2 | ssrdv 3230 | . 2 ⊢ (𝜑 → 𝐴 ⊆ ∅) |
| 4 | ss0 3532 | . 2 ⊢ (𝐴 ⊆ ∅ → 𝐴 = ∅) | |
| 5 | 3, 4 | syl 14 | 1 ⊢ (𝜑 → 𝐴 = ∅) |
| Colors of variables: wff set class |
| Syntax hints: ¬ wn 3 → wi 4 = wceq 1395 ∈ wcel 2200 ⊆ wss 3197 ∅c0 3491 |
| 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-v 2801 df-dif 3199 df-in 3203 df-ss 3210 df-nul 3492 |
| This theorem is referenced by: exmid01 4281 dcextest 4672 nfvres 5662 map0b 6832 snon0 7098 snexxph 7113 fodju0 7310 fzdisj 10244 bldisj 15069 |
| Copyright terms: Public domain | W3C validator |