Metamath Proof Explorer |
< Previous
Next >
Nearby theorems |
||
Mirrors > Home > MPE Home > Th. List > dfrel2 | Structured version Visualization version 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 5962 | . . 3 ⊢ Rel ◡◡𝑅 | |
2 | vex 3498 | . . . . . 6 ⊢ 𝑥 ∈ V | |
3 | vex 3498 | . . . . . 6 ⊢ 𝑦 ∈ V | |
4 | 2, 3 | opelcnv 5747 | . . . . 5 ⊢ (〈𝑥, 𝑦〉 ∈ ◡◡𝑅 ↔ 〈𝑦, 𝑥〉 ∈ ◡𝑅) |
5 | 3, 2 | opelcnv 5747 | . . . . 5 ⊢ (〈𝑦, 𝑥〉 ∈ ◡𝑅 ↔ 〈𝑥, 𝑦〉 ∈ 𝑅) |
6 | 4, 5 | bitri 277 | . . . 4 ⊢ (〈𝑥, 𝑦〉 ∈ ◡◡𝑅 ↔ 〈𝑥, 𝑦〉 ∈ 𝑅) |
7 | 6 | eqrelriv 5657 | . . 3 ⊢ ((Rel ◡◡𝑅 ∧ Rel 𝑅) → ◡◡𝑅 = 𝑅) |
8 | 1, 7 | mpan 688 | . 2 ⊢ (Rel 𝑅 → ◡◡𝑅 = 𝑅) |
9 | releq 5646 | . . 3 ⊢ (◡◡𝑅 = 𝑅 → (Rel ◡◡𝑅 ↔ Rel 𝑅)) | |
10 | 1, 9 | mpbii 235 | . 2 ⊢ (◡◡𝑅 = 𝑅 → Rel 𝑅) |
11 | 8, 10 | impbii 211 | 1 ⊢ (Rel 𝑅 ↔ ◡◡𝑅 = 𝑅) |
Colors of variables: wff setvar class |
Syntax hints: ↔ wb 208 = wceq 1533 ∈ wcel 2110 〈cop 4567 ◡ccnv 5549 Rel wrel 5555 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1792 ax-4 1806 ax-5 1907 ax-6 1966 ax-7 2011 ax-8 2112 ax-9 2120 ax-10 2141 ax-11 2156 ax-12 2172 ax-ext 2793 ax-sep 5196 ax-nul 5203 ax-pr 5322 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3an 1085 df-tru 1536 df-ex 1777 df-nf 1781 df-sb 2066 df-mo 2618 df-eu 2650 df-clab 2800 df-cleq 2814 df-clel 2893 df-nfc 2963 df-rab 3147 df-v 3497 df-dif 3939 df-un 3941 df-in 3943 df-ss 3952 df-nul 4292 df-if 4468 df-sn 4562 df-pr 4564 df-op 4568 df-br 5060 df-opab 5122 df-xp 5556 df-rel 5557 df-cnv 5558 |
This theorem is referenced by: dfrel4v 6042 cnvcnv 6044 cnveqb 6048 dfrel3 6050 cnvcnvres 6057 cnvsng 6075 cores2 6107 co01 6109 coi2 6111 relcnvtrg 6114 funcnvres2 6429 f1cnvcnv 6579 f1ocnv 6622 f1ocnvb 6623 f1ococnv1 6638 fimacnvinrn 6835 isores1 7081 relcnvexb 7625 cnvf1o 7800 fnwelem 7819 tposf12 7911 ssenen 8685 cantnffval2 9152 fsumcnv 15122 fprodcnv 15331 structcnvcnv 16491 imasless 16807 oppcinv 17044 cnvps 17816 cnvpsb 17817 cnvtsr 17826 gimcnv 18401 lmimcnv 19833 hmeocnv 22364 hmeocnvb 22376 cmphaushmeo 22402 ustexsym 22818 pi1xfrcnv 23655 dvlog 25228 efopnlem2 25234 gtiso 30430 cycpmconjvlem 30778 cycpmconjs 30793 f1ocan2fv 34996 relcnveq3 35572 relcnveq2 35574 brcnvrabga 35593 dfrel5 35597 elrelscnveq3 35725 elrelscnveq2 35727 ltrncnvnid 37257 relintab 39936 cnvssb 39939 relnonrel 39940 cononrel1 39947 cononrel2 39948 clrellem 39975 clcnvlem 39976 relexpaddss 40056 |
Copyright terms: Public domain | W3C validator |