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Mirrors > Home > ILE Home > Th. List > resieq | GIF version |
Description: A restricted identity relation is equivalent to equality in its domain. (Contributed by NM, 30-Apr-2004.) |
Ref | Expression |
---|---|
resieq | ⊢ ((𝐵 ∈ 𝐴 ∧ 𝐶 ∈ 𝐴) → (𝐵( I ↾ 𝐴)𝐶 ↔ 𝐵 = 𝐶)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | breq2 3933 | . . . . 5 ⊢ (𝑥 = 𝐶 → (𝐵( I ↾ 𝐴)𝑥 ↔ 𝐵( I ↾ 𝐴)𝐶)) | |
2 | eqeq2 2149 | . . . . 5 ⊢ (𝑥 = 𝐶 → (𝐵 = 𝑥 ↔ 𝐵 = 𝐶)) | |
3 | 1, 2 | bibi12d 234 | . . . 4 ⊢ (𝑥 = 𝐶 → ((𝐵( I ↾ 𝐴)𝑥 ↔ 𝐵 = 𝑥) ↔ (𝐵( I ↾ 𝐴)𝐶 ↔ 𝐵 = 𝐶))) |
4 | 3 | imbi2d 229 | . . 3 ⊢ (𝑥 = 𝐶 → ((𝐵 ∈ 𝐴 → (𝐵( I ↾ 𝐴)𝑥 ↔ 𝐵 = 𝑥)) ↔ (𝐵 ∈ 𝐴 → (𝐵( I ↾ 𝐴)𝐶 ↔ 𝐵 = 𝐶)))) |
5 | vex 2689 | . . . . 5 ⊢ 𝑥 ∈ V | |
6 | 5 | opres 4828 | . . . 4 ⊢ (𝐵 ∈ 𝐴 → (〈𝐵, 𝑥〉 ∈ ( I ↾ 𝐴) ↔ 〈𝐵, 𝑥〉 ∈ I )) |
7 | df-br 3930 | . . . 4 ⊢ (𝐵( I ↾ 𝐴)𝑥 ↔ 〈𝐵, 𝑥〉 ∈ ( I ↾ 𝐴)) | |
8 | 5 | ideq 4691 | . . . . 5 ⊢ (𝐵 I 𝑥 ↔ 𝐵 = 𝑥) |
9 | df-br 3930 | . . . . 5 ⊢ (𝐵 I 𝑥 ↔ 〈𝐵, 𝑥〉 ∈ I ) | |
10 | 8, 9 | bitr3i 185 | . . . 4 ⊢ (𝐵 = 𝑥 ↔ 〈𝐵, 𝑥〉 ∈ I ) |
11 | 6, 7, 10 | 3bitr4g 222 | . . 3 ⊢ (𝐵 ∈ 𝐴 → (𝐵( I ↾ 𝐴)𝑥 ↔ 𝐵 = 𝑥)) |
12 | 4, 11 | vtoclg 2746 | . 2 ⊢ (𝐶 ∈ 𝐴 → (𝐵 ∈ 𝐴 → (𝐵( I ↾ 𝐴)𝐶 ↔ 𝐵 = 𝐶))) |
13 | 12 | impcom 124 | 1 ⊢ ((𝐵 ∈ 𝐴 ∧ 𝐶 ∈ 𝐴) → (𝐵( I ↾ 𝐴)𝐶 ↔ 𝐵 = 𝐶)) |
Colors of variables: wff set class |
Syntax hints: → wi 4 ∧ wa 103 ↔ wb 104 = wceq 1331 ∈ wcel 1480 〈cop 3530 class class class wbr 3929 I cid 4210 ↾ cres 4541 |
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-id 4215 df-xp 4545 df-rel 4546 df-res 4551 |
This theorem is referenced by: foeqcnvco 5691 f1eqcocnv 5692 |
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