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| Mirrors > Home > ILE Home > Th. List > 0nelrel | GIF version | ||
| Description: A binary relation does not contain the empty set. (Contributed by AV, 15-Nov-2021.) |
| Ref | Expression |
|---|---|
| 0nelrel | ⊢ (Rel 𝑅 → ∅ ∉ 𝑅) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | df-rel 4730 | . . . 4 ⊢ (Rel 𝑅 ↔ 𝑅 ⊆ (V × V)) | |
| 2 | 1 | biimpi 120 | . . 3 ⊢ (Rel 𝑅 → 𝑅 ⊆ (V × V)) |
| 3 | 0nelxp 4751 | . . . 4 ⊢ ¬ ∅ ∈ (V × V) | |
| 4 | 3 | a1i 9 | . . 3 ⊢ (Rel 𝑅 → ¬ ∅ ∈ (V × V)) |
| 5 | 2, 4 | ssneldd 3228 | . 2 ⊢ (Rel 𝑅 → ¬ ∅ ∈ 𝑅) |
| 6 | df-nel 2496 | . 2 ⊢ (∅ ∉ 𝑅 ↔ ¬ ∅ ∈ 𝑅) | |
| 7 | 5, 6 | sylibr 134 | 1 ⊢ (Rel 𝑅 → ∅ ∉ 𝑅) |
| Colors of variables: wff set class |
| Syntax hints: ¬ wn 3 → wi 4 ∈ wcel 2200 ∉ wnel 2495 Vcvv 2800 ⊆ wss 3198 ∅c0 3492 × cxp 4721 Rel wrel 4728 |
| 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-14 2203 ax-ext 2211 ax-sep 4205 ax-pow 4262 ax-pr 4297 |
| This theorem depends on definitions: df-bi 117 df-3an 1004 df-tru 1398 df-fal 1401 df-nf 1507 df-sb 1809 df-clab 2216 df-cleq 2222 df-clel 2225 df-nfc 2361 df-ne 2401 df-nel 2496 df-v 2802 df-dif 3200 df-un 3202 df-in 3204 df-ss 3211 df-nul 3493 df-pw 3652 df-sn 3673 df-pr 3674 df-op 3676 df-opab 4149 df-xp 4729 df-rel 4730 |
| This theorem is referenced by: 0nelfun 5342 |
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