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Mirrors > Home > ILE Home > Th. List > dmcnvcnv | GIF version |
Description: The domain of the double converse of a class (which doesn't have to be a relation as in dfrel2 4791). (Contributed by NM, 8-Apr-2007.) |
Ref | Expression |
---|---|
dmcnvcnv | ⊢ dom ◡◡𝐴 = dom 𝐴 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | dfdm4 4545 | . 2 ⊢ dom 𝐴 = ran ◡𝐴 | |
2 | df-rn 4374 | . 2 ⊢ ran ◡𝐴 = dom ◡◡𝐴 | |
3 | 1, 2 | eqtr2i 2102 | 1 ⊢ dom ◡◡𝐴 = dom 𝐴 |
Colors of variables: wff set class |
Syntax hints: = wceq 1284 ◡ccnv 4362 dom cdm 4363 ran crn 4364 |
This theorem was proved from axioms: ax-1 5 ax-2 6 ax-mp 7 ax-ia1 104 ax-ia2 105 ax-ia3 106 ax-io 662 ax-5 1376 ax-7 1377 ax-gen 1378 ax-ie1 1422 ax-ie2 1423 ax-8 1435 ax-10 1436 ax-11 1437 ax-i12 1438 ax-bndl 1439 ax-4 1440 ax-14 1445 ax-17 1459 ax-i9 1463 ax-ial 1467 ax-i5r 1468 ax-ext 2063 ax-sep 3896 ax-pow 3948 ax-pr 3964 |
This theorem depends on definitions: df-bi 115 df-3an 921 df-tru 1287 df-nf 1390 df-sb 1686 df-eu 1944 df-mo 1945 df-clab 2068 df-cleq 2074 df-clel 2077 df-nfc 2208 df-v 2603 df-un 2977 df-in 2979 df-ss 2986 df-pw 3384 df-sn 3404 df-pr 3405 df-op 3407 df-br 3786 df-opab 3840 df-cnv 4371 df-dm 4373 df-rn 4374 |
This theorem is referenced by: resdm2 4831 f1cnvcnv 5120 |
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