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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 4732 | . . . 4 ⊢ (Rel 𝑅 ↔ 𝑅 ⊆ (V × V)) | |
| 2 | 1 | biimpi 120 | . . 3 ⊢ (Rel 𝑅 → 𝑅 ⊆ (V × V)) |
| 3 | 0nelxp 4753 | . . . 4 ⊢ ¬ ∅ ∈ (V × V) | |
| 4 | 3 | a1i 9 | . . 3 ⊢ (Rel 𝑅 → ¬ ∅ ∈ (V × V)) |
| 5 | 2, 4 | ssneldd 3230 | . 2 ⊢ (Rel 𝑅 → ¬ ∅ ∈ 𝑅) |
| 6 | df-nel 2498 | . 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 2202 ∉ wnel 2497 Vcvv 2802 ⊆ wss 3200 ∅c0 3494 × cxp 4723 Rel wrel 4730 |
| 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-14 2205 ax-ext 2213 ax-sep 4207 ax-pow 4264 ax-pr 4299 |
| This theorem depends on definitions: df-bi 117 df-3an 1006 df-tru 1400 df-fal 1403 df-nf 1509 df-sb 1811 df-clab 2218 df-cleq 2224 df-clel 2227 df-nfc 2363 df-ne 2403 df-nel 2498 df-v 2804 df-dif 3202 df-un 3204 df-in 3206 df-ss 3213 df-nul 3495 df-pw 3654 df-sn 3675 df-pr 3676 df-op 3678 df-opab 4151 df-xp 4731 df-rel 4732 |
| This theorem is referenced by: 0nelfun 5344 |
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