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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 2628 | . . . 4 ⊢ (x = A → (yRx ↔ yRA)) | |
| 2 | breq1 2627 | . . . 4 ⊢ (y = B → (yRA ↔ BRA)) | |
| 3 | 1, 2 | opelopabg 2823 | . . 3 ⊢ ((A ∈ C ⋀ B ∈ D) → (〈A, B〉 ∈ {〈x, y〉∣yRx} ↔ BRA)) |
| 4 | df-cnv 3192 | . . . 4 ⊢ ◡R = {〈x, y〉∣yRx} | |
| 5 | 4 | eleq2i 1541 | . . 3 ⊢ (〈A, B〉 ∈ ◡R ↔ 〈A, B〉 ∈ {〈x, y〉∣yRx}) |
| 6 | 3, 5 | syl5bb 534 | . 2 ⊢ ((A ∈ C ⋀ B ∈ D) → (〈A, B〉 ∈ ◡R ↔ BRA)) |
| 7 | df-br 2625 | . 2 ⊢ (BRA ↔ 〈B, A〉 ∈ R) | |
| 8 | 6, 7 | syl6bb 538 | 1 ⊢ ((A ∈ C ⋀ B ∈ D) → (〈A, B〉 ∈ ◡R ↔ 〈B, A〉 ∈ R)) |
| Colors of variables: wff set class |
| Syntax hints: → wi 3 ↔ wb 146 ⋀ wa 223 ∈ wcel 960 〈cop 2415 class class class wbr 2624 {copab 2671 ◡ccnv 3175 |
| This theorem is referenced by: brcnvg 3303 opelcnv 3304 fvimacnv 3811 xrlenltt 5513 |
| This theorem was proved from axioms: ax-1 4 ax-2 5 ax-3 6 ax-mp 7 ax-7 964 ax-gen 965 ax-8 966 ax-10 968 ax-11 969 ax-12 970 ax-13 971 ax-14 972 ax-17 973 ax-4 975 ax-5o 977 ax-6o 980 ax-9o 1125 ax-10o 1142 ax-16 1212 ax-11o 1220 ax-ext 1462 ax-sep 2708 ax-pow 2748 ax-pr 2785 |
| This theorem depends on definitions: df-bi 147 df-or 224 df-an 225 df-ex 983 df-sb 1174 df-eu 1384 df-mo 1385 df-clab 1467 df-cleq 1472 df-clel 1475 df-ne 1590 df-v 1815 df-dif 2052 df-un 2053 df-in 2054 df-ss 2056 df-nul 2284 df-pw 2406 df-sn 2416 df-pr 2417 df-op 2420 df-br 2625 df-opab 2672 df-cnv 3192 |