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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 4761 | . . . 4 ⊢ (Rel 𝑅 ↔ 𝑅 ⊆ (V × V)) | |
| 2 | 1 | biimpi 120 | . . 3 ⊢ (Rel 𝑅 → 𝑅 ⊆ (V × V)) |
| 3 | 0nelxp 4782 | . . . 4 ⊢ ¬ ∅ ∈ (V × V) | |
| 4 | 3 | a1i 9 | . . 3 ⊢ (Rel 𝑅 → ¬ ∅ ∈ (V × V)) |
| 5 | 2, 4 | ssneldd 3245 | . 2 ⊢ (Rel 𝑅 → ¬ ∅ ∈ 𝑅) |
| 6 | df-nel 2510 | . 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 2205 ∉ wnel 2509 Vcvv 2815 ⊆ wss 3214 ∅c0 3512 × cxp 4752 Rel wrel 4759 |
| 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 717 ax-5 1496 ax-7 1497 ax-gen 1498 ax-ie1 1542 ax-ie2 1543 ax-8 1553 ax-10 1554 ax-11 1555 ax-i12 1556 ax-bndl 1558 ax-4 1559 ax-17 1575 ax-i9 1579 ax-ial 1583 ax-i5r 1584 ax-14 2208 ax-ext 2216 ax-sep 4233 ax-pow 4292 ax-pr 4327 |
| This theorem depends on definitions: df-bi 117 df-3an 1007 df-tru 1401 df-fal 1404 df-nf 1510 df-sb 1812 df-clab 2221 df-cleq 2227 df-clel 2230 df-nfc 2375 df-ne 2415 df-nel 2510 df-v 2817 df-dif 3216 df-un 3218 df-in 3220 df-ss 3227 df-nul 3513 df-pw 3676 df-sn 3700 df-pr 3701 df-op 3703 df-opab 4177 df-xp 4760 df-rel 4761 |
| This theorem is referenced by: 0nelfun 5375 |
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