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Related theorems GIF version |
| Description: Ordered-pair membership in converse. |
| Ref | Expression |
|---|---|
| opelcnvg | ⊢ ((A ∈ C ∧ B ∈ D) → (〈A, B〉 ∈ ◡R ↔ 〈B, A〉 ∈ R)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | breq2 2066 | . . . 4 ⊢ (x = A → (yRx ↔ yRA)) | |
| 2 | breq1 2065 | . . . 4 ⊢ (y = B → (yRA ↔ BRA)) | |
| 3 | 1, 2 | opelopabg 2115 | . . 3 ⊢ ((A ∈ C ∧ B ∈ D) → (〈A, B〉 ∈ {〈x, y〉∣yRx} ↔ BRA)) |
| 4 | df-cnv 2426 | . . . 4 ⊢ ◡R = {〈x, y〉∣yRx} | |
| 5 | 4 | eleq2i 1153 | . . 3 ⊢ (〈A, B〉 ∈ ◡R ↔ 〈A, B〉 ∈ {〈x, y〉∣yRx}) |
| 6 | 3, 5 | syl5bb 410 | . 2 ⊢ ((A ∈ C ∧ B ∈ D) → (〈A, B〉 ∈ ◡R ↔ BRA)) |
| 7 | df-br 2063 | . 2 ⊢ (BRA ↔ 〈B, A〉 ∈ R) | |
| 8 | 6, 7 | syl6bb 414 | 1 ⊢ ((A ∈ C ∧ B ∈ D) → (〈A, B〉 ∈ ◡R ↔ 〈B, A〉 ∈ R)) |
| Colors of variables: wff set class |
| Syntax hints: → wi 2 ↔ wb 127 ∧ wa 196 ∈ wcel 1092 〈cop 1810 class class class wbr 2054 {copab 2055 ◡ccnv 2409 |
| This theorem is referenced by: opelcnv 2518 leltt 4278 |
| This theorem was proved from axioms: ax-1 3 ax-2 4 ax-3 5 ax-mp 6 ax-4 673 ax-5 674 ax-6 675 ax-7 676 ax-gen 677 ax-8 798 ax-9 799 ax-10 800 ax-11 801 ax-12 802 ax-13 804 ax-14 805 ax-16 922 ax-17 925 ax-ext 1074 ax-rep 1075 ax-pow 1077 |
| This theorem depends on definitions: df-bi 128 df-or 197 df-an 198 df-ex 679 df-sb 853 df-clab 1093 df-cleq 1097 df-clel 1099 df-v 1349 df-dif 1489 df-un 1490 df-in 1491 df-ss 1492 df-nul 1708 df-pw 1799 df-sn 1811 df-pr 1812 df-op 1815 df-br 2063 df-opab 2098 df-cnv 2426 |