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Mirrors > Home > ILE Home > Th. List > relrn0 | GIF version |
Description: A relation is empty iff its range is empty. (Contributed by NM, 15-Sep-2004.) |
Ref | Expression |
---|---|
relrn0 | ⊢ (Rel 𝐴 → (𝐴 = ∅ ↔ ran 𝐴 = ∅)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | reldm0 4654 | . 2 ⊢ (Rel 𝐴 → (𝐴 = ∅ ↔ dom 𝐴 = ∅)) | |
2 | dm0rn0 4653 | . 2 ⊢ (dom 𝐴 = ∅ ↔ ran 𝐴 = ∅) | |
3 | 1, 2 | syl6bb 194 | 1 ⊢ (Rel 𝐴 → (𝐴 = ∅ ↔ ran 𝐴 = ∅)) |
Colors of variables: wff set class |
Syntax hints: → wi 4 ↔ wb 103 = wceq 1289 ∅c0 3286 dom cdm 4438 ran crn 4439 Rel wrel 4443 |
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-14 1450 ax-17 1464 ax-i9 1468 ax-ial 1472 ax-i5r 1473 ax-ext 2070 ax-sep 3957 ax-pow 4009 ax-pr 4036 |
This theorem depends on definitions: df-bi 115 df-3an 926 df-tru 1292 df-fal 1295 df-nf 1395 df-sb 1693 df-eu 1951 df-mo 1952 df-clab 2075 df-cleq 2081 df-clel 2084 df-nfc 2217 df-v 2621 df-dif 3001 df-un 3003 df-in 3005 df-ss 3012 df-nul 3287 df-pw 3431 df-sn 3452 df-pr 3453 df-op 3455 df-br 3846 df-opab 3900 df-xp 4444 df-rel 4445 df-cnv 4446 df-dm 4448 df-rn 4449 |
This theorem is referenced by: cnvsn0 4899 |
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