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Theorem morcat 25780
Description: Two ways to define the set of the morphisms of a category. (Contributed by FL, 19-Sep-2009.)
Assertion
Ref Expression
morcat  |-  ( T  e.  Cat OLD  ->  dom  ( dom_ `  T
)  =  dom  ( cod_ `  T ) )

Proof of Theorem morcat
StepHypRef Expression
1 eqid 2283 . . 3  |-  dom  ( dom_ `  T )  =  dom  ( dom_ `  T
)
2 eqid 2283 . . 3  |-  ( dom_ `  T )  =  (
dom_ `  T )
3 eqid 2283 . . 3  |-  dom  ( id_ `  T )  =  dom  ( id_ `  T
)
4 eqid 2283 . . 3  |-  ( id_ `  T )  =  ( id_ `  T )
5 eqid 2283 . . 3  |-  ( cod_ `  T )  =  (
cod_ `  T )
61, 2, 3, 4, 5codc 25766 . 2  |-  ( T  e.  Cat OLD  ->  (
cod_ `  T ) : dom  ( dom_ `  T
) --> dom  ( id_ `  T ) )
7 fdm 5393 . . 3  |-  ( (
cod_ `  T ) : dom  ( dom_ `  T
) --> dom  ( id_ `  T )  ->  dom  ( cod_ `  T )  =  dom  ( dom_ `  T
) )
87eqcomd 2288 . 2  |-  ( (
cod_ `  T ) : dom  ( dom_ `  T
) --> dom  ( id_ `  T )  ->  dom  ( dom_ `  T )  =  dom  ( cod_ `  T
) )
96, 8syl 15 1  |-  ( T  e.  Cat OLD  ->  dom  ( dom_ `  T
)  =  dom  ( cod_ `  T ) )
Colors of variables: wff set class
Syntax hints:    -> wi 4    = wceq 1623    e. wcel 1684   dom cdm 4689   -->wf 5251   ` cfv 5255   dom_cdom_ 25712   cod_ccod_ 25713   id_cid_ 25714    Cat
OLD ccatOLD 25752
This theorem is referenced by:  idsubfun  25858
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8  ax-gen 1533  ax-5 1544  ax-17 1603  ax-9 1635  ax-8 1643  ax-13 1686  ax-14 1688  ax-6 1703  ax-7 1708  ax-11 1715  ax-12 1866  ax-ext 2264  ax-sep 4141  ax-nul 4149  ax-pow 4188  ax-pr 4214  ax-un 4512
This theorem depends on definitions:  df-bi 177  df-or 359  df-an 360  df-3an 936  df-tru 1310  df-ex 1529  df-nf 1532  df-sb 1630  df-eu 2147  df-mo 2148  df-clab 2270  df-cleq 2276  df-clel 2279  df-nfc 2408  df-ne 2448  df-ral 2548  df-rex 2549  df-rab 2552  df-v 2790  df-sbc 2992  df-dif 3155  df-un 3157  df-in 3159  df-ss 3166  df-nul 3456  df-if 3566  df-sn 3646  df-pr 3647  df-op 3649  df-uni 3828  df-int 3863  df-br 4024  df-opab 4078  df-mpt 4079  df-id 4309  df-xp 4695  df-rel 4696  df-cnv 4697  df-co 4698  df-dm 4699  df-rn 4700  df-res 4701  df-ima 4702  df-iota 5219  df-fun 5257  df-fn 5258  df-f 5259  df-fo 5261  df-fv 5263  df-ov 5861  df-1st 6122  df-2nd 6123  df-alg 25716  df-dom_ 25717  df-cod_ 25718  df-id_ 25719  df-cmpa 25720  df-ded 25735  df-catOLD 25753
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