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Mirrors > Home > ILE Home > Th. List > rescnvcnv | GIF version |
Description: The restriction of the double converse of a class. (Contributed by NM, 8-Apr-2007.) (Proof shortened by Andrew Salmon, 27-Aug-2011.) |
Ref | Expression |
---|---|
rescnvcnv | ⊢ (◡◡𝐴 ↾ 𝐵) = (𝐴 ↾ 𝐵) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | cnvcnv2 5000 | . . 3 ⊢ ◡◡𝐴 = (𝐴 ↾ V) | |
2 | 1 | reseq1i 4823 | . 2 ⊢ (◡◡𝐴 ↾ 𝐵) = ((𝐴 ↾ V) ↾ 𝐵) |
3 | resres 4839 | . 2 ⊢ ((𝐴 ↾ V) ↾ 𝐵) = (𝐴 ↾ (V ∩ 𝐵)) | |
4 | ssv 3124 | . . . 4 ⊢ 𝐵 ⊆ V | |
5 | sseqin2 3300 | . . . 4 ⊢ (𝐵 ⊆ V ↔ (V ∩ 𝐵) = 𝐵) | |
6 | 4, 5 | mpbi 144 | . . 3 ⊢ (V ∩ 𝐵) = 𝐵 |
7 | 6 | reseq2i 4824 | . 2 ⊢ (𝐴 ↾ (V ∩ 𝐵)) = (𝐴 ↾ 𝐵) |
8 | 2, 3, 7 | 3eqtri 2165 | 1 ⊢ (◡◡𝐴 ↾ 𝐵) = (𝐴 ↾ 𝐵) |
Colors of variables: wff set class |
Syntax hints: = wceq 1332 Vcvv 2689 ∩ cin 3075 ⊆ wss 3076 ◡ccnv 4546 ↾ cres 4549 |
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 699 ax-5 1424 ax-7 1425 ax-gen 1426 ax-ie1 1470 ax-ie2 1471 ax-8 1483 ax-10 1484 ax-11 1485 ax-i12 1486 ax-bndl 1487 ax-4 1488 ax-14 1493 ax-17 1507 ax-i9 1511 ax-ial 1515 ax-i5r 1516 ax-ext 2122 ax-sep 4054 ax-pow 4106 ax-pr 4139 |
This theorem depends on definitions: df-bi 116 df-3an 965 df-tru 1335 df-nf 1438 df-sb 1737 df-eu 2003 df-mo 2004 df-clab 2127 df-cleq 2133 df-clel 2136 df-nfc 2271 df-ral 2422 df-rex 2423 df-v 2691 df-un 3080 df-in 3082 df-ss 3089 df-pw 3517 df-sn 3538 df-pr 3539 df-op 3541 df-br 3938 df-opab 3998 df-xp 4553 df-rel 4554 df-cnv 4555 df-res 4559 |
This theorem is referenced by: cnvcnvres 5010 imacnvcnv 5011 resdm2 5037 resdmres 5038 coires1 5064 cocnvres 5071 f1oresrab 5593 |
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