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Mirrors > Home > ILE Home > Th. List > dfrel2 | GIF version |
Description: Alternate definition of relation. Exercise 2 of [TakeutiZaring] p. 25. (Contributed by NM, 29-Dec-1996.) |
Ref | Expression |
---|---|
dfrel2 | ⊢ (Rel 𝑅 ↔ ◡◡𝑅 = 𝑅) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | relcnv 4917 | . . 3 ⊢ Rel ◡◡𝑅 | |
2 | vex 2689 | . . . . . 6 ⊢ 𝑥 ∈ V | |
3 | vex 2689 | . . . . . 6 ⊢ 𝑦 ∈ V | |
4 | 2, 3 | opelcnv 4721 | . . . . 5 ⊢ (〈𝑥, 𝑦〉 ∈ ◡◡𝑅 ↔ 〈𝑦, 𝑥〉 ∈ ◡𝑅) |
5 | 3, 2 | opelcnv 4721 | . . . . 5 ⊢ (〈𝑦, 𝑥〉 ∈ ◡𝑅 ↔ 〈𝑥, 𝑦〉 ∈ 𝑅) |
6 | 4, 5 | bitri 183 | . . . 4 ⊢ (〈𝑥, 𝑦〉 ∈ ◡◡𝑅 ↔ 〈𝑥, 𝑦〉 ∈ 𝑅) |
7 | 6 | eqrelriv 4632 | . . 3 ⊢ ((Rel ◡◡𝑅 ∧ Rel 𝑅) → ◡◡𝑅 = 𝑅) |
8 | 1, 7 | mpan 420 | . 2 ⊢ (Rel 𝑅 → ◡◡𝑅 = 𝑅) |
9 | releq 4621 | . . 3 ⊢ (◡◡𝑅 = 𝑅 → (Rel ◡◡𝑅 ↔ Rel 𝑅)) | |
10 | 1, 9 | mpbii 147 | . 2 ⊢ (◡◡𝑅 = 𝑅 → Rel 𝑅) |
11 | 8, 10 | impbii 125 | 1 ⊢ (Rel 𝑅 ↔ ◡◡𝑅 = 𝑅) |
Colors of variables: wff set class |
Syntax hints: ↔ wb 104 = wceq 1331 ∈ wcel 1480 〈cop 3530 ◡ccnv 4538 Rel wrel 4544 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-io 698 ax-5 1423 ax-7 1424 ax-gen 1425 ax-ie1 1469 ax-ie2 1470 ax-8 1482 ax-10 1483 ax-11 1484 ax-i12 1485 ax-bndl 1486 ax-4 1487 ax-14 1492 ax-17 1506 ax-i9 1510 ax-ial 1514 ax-i5r 1515 ax-ext 2121 ax-sep 4046 ax-pow 4098 ax-pr 4131 |
This theorem depends on definitions: df-bi 116 df-3an 964 df-tru 1334 df-nf 1437 df-sb 1736 df-eu 2002 df-mo 2003 df-clab 2126 df-cleq 2132 df-clel 2135 df-nfc 2270 df-ral 2421 df-rex 2422 df-v 2688 df-un 3075 df-in 3077 df-ss 3084 df-pw 3512 df-sn 3533 df-pr 3534 df-op 3536 df-br 3930 df-opab 3990 df-xp 4545 df-rel 4546 df-cnv 4547 |
This theorem is referenced by: dfrel4v 4990 cnvcnv 4991 cnveqb 4994 dfrel3 4996 cnvcnvres 5002 cnvsn 5021 cores2 5051 co01 5053 coi2 5055 relcnvtr 5058 relcnvexb 5078 funcnvres2 5198 f1cnvcnv 5339 f1ocnv 5380 f1ocnvb 5381 f1ococnv1 5396 isores1 5715 cnvf1o 6122 tposf12 6166 ssenen 6745 relcnvfi 6829 caseinl 6976 caseinr 6977 fsumcnv 11213 structcnvcnv 11985 hmeocnv 12486 hmeocnvb 12497 |
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