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Theorem cocnvcnv2 5517
 Description: A composition is not affected by a double converse of its second argument. (Contributed by NM, 8-Oct-2007.)
Assertion
Ref Expression
cocnvcnv2

Proof of Theorem cocnvcnv2
StepHypRef Expression
1 cnvcnv2 5458 . . 3
21coeq2i 5161 . 2
3 resco 5509 . 2
4 relco 5503 . . 3
5 dfrel3 5462 . . 3
64, 5mpbi 208 . 2
72, 3, 63eqtr2i 2502 1
 Colors of variables: wff setvar class Syntax hints:   wceq 1379  cvv 3113  ccnv 4998   cres 5001   ccom 5003   wrel 5004 This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1601  ax-4 1612  ax-5 1680  ax-6 1719  ax-7 1739  ax-9 1771  ax-10 1786  ax-11 1791  ax-12 1803  ax-13 1968  ax-ext 2445  ax-sep 4568  ax-nul 4576  ax-pr 4686 This theorem depends on definitions:  df-bi 185  df-or 370  df-an 371  df-3an 975  df-tru 1382  df-ex 1597  df-nf 1600  df-sb 1712  df-eu 2279  df-mo 2280  df-clab 2453  df-cleq 2459  df-clel 2462  df-nfc 2617  df-ne 2664  df-ral 2819  df-rex 2820  df-rab 2823  df-v 3115  df-dif 3479  df-un 3481  df-in 3483  df-ss 3490  df-nul 3786  df-if 3940  df-sn 4028  df-pr 4030  df-op 4034  df-br 4448  df-opab 4506  df-xp 5005  df-rel 5006  df-cnv 5007  df-co 5008  df-res 5011 This theorem is referenced by:  dfdm2  5537  cofunex2g  6746  cnvtrrel  36792
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