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Mirrors > Home > ILE Home > Th. List > cnvcnv2 | GIF version |
Description: The double converse of a class equals its restriction to the universe. (Contributed by NM, 8-Oct-2007.) |
Ref | Expression |
---|---|
cnvcnv2 | ⊢ ◡◡𝐴 = (𝐴 ↾ V) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | cnvcnv 4999 | . 2 ⊢ ◡◡𝐴 = (𝐴 ∩ (V × V)) | |
2 | df-res 4559 | . 2 ⊢ (𝐴 ↾ V) = (𝐴 ∩ (V × V)) | |
3 | 1, 2 | eqtr4i 2164 | 1 ⊢ ◡◡𝐴 = (𝐴 ↾ V) |
Colors of variables: wff set class |
Syntax hints: = wceq 1332 Vcvv 2689 ∩ cin 3075 × cxp 4545 ◡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: dfrel3 5004 rnresv 5006 rescnvcnv 5009 cocnvcnv1 5057 cocnvcnv2 5058 strslfv2d 12040 |
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