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Theorem relcoi2 5151
Description: Composition with the identity relation restricted to a relation's field. (Contributed by FL, 2-May-2011.)
Assertion
Ref Expression
relcoi2  |-  ( Rel 
R  ->  ( (  _I  |`  U. U. R
)  o.  R )  =  R )

Proof of Theorem relcoi2
StepHypRef Expression
1 dmrnssfld 4883 . . . 4  |-  ( dom 
R  u.  ran  R
)  C_  U. U. R
2 unss 3307 . . . . 5  |-  ( ( dom  R  C_  U. U. R  /\  ran  R  C_  U.
U. R )  <->  ( dom  R  u.  ran  R ) 
C_  U. U. R )
3 simpr 110 . . . . 5  |-  ( ( dom  R  C_  U. U. R  /\  ran  R  C_  U.
U. R )  ->  ran  R  C_  U. U. R
)
42, 3sylbir 135 . . . 4  |-  ( ( dom  R  u.  ran  R )  C_  U. U. R  ->  ran  R  C_  U. U. R )
51, 4ax-mp 5 . . 3  |-  ran  R  C_ 
U. U. R
6 cores 5124 . . 3  |-  ( ran 
R  C_  U. U. R  ->  ( (  _I  |`  U. U. R )  o.  R
)  =  (  _I  o.  R ) )
75, 6mp1i 10 . 2  |-  ( Rel 
R  ->  ( (  _I  |`  U. U. R
)  o.  R )  =  (  _I  o.  R ) )
8 coi2 5137 . 2  |-  ( Rel 
R  ->  (  _I  o.  R )  =  R )
97, 8eqtrd 2208 1  |-  ( Rel 
R  ->  ( (  _I  |`  U. U. R
)  o.  R )  =  R )
Colors of variables: wff set class
Syntax hints:    -> wi 4    /\ wa 104    = wceq 1353    u. cun 3125    C_ wss 3127   U.cuni 3805    _I cid 4282   dom cdm 4620   ran crn 4621    |` cres 4622    o. ccom 4624   Rel wrel 4625
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-io 709  ax-5 1445  ax-7 1446  ax-gen 1447  ax-ie1 1491  ax-ie2 1492  ax-8 1502  ax-10 1503  ax-11 1504  ax-i12 1505  ax-bndl 1507  ax-4 1508  ax-17 1524  ax-i9 1528  ax-ial 1532  ax-i5r 1533  ax-14 2149  ax-ext 2157  ax-sep 4116  ax-pow 4169  ax-pr 4203
This theorem depends on definitions:  df-bi 117  df-3an 980  df-tru 1356  df-nf 1459  df-sb 1761  df-eu 2027  df-mo 2028  df-clab 2162  df-cleq 2168  df-clel 2171  df-nfc 2306  df-ral 2458  df-rex 2459  df-v 2737  df-un 3131  df-in 3133  df-ss 3140  df-pw 3574  df-sn 3595  df-pr 3596  df-op 3598  df-uni 3806  df-br 3999  df-opab 4060  df-id 4287  df-xp 4626  df-rel 4627  df-cnv 4628  df-co 4629  df-dm 4630  df-rn 4631  df-res 4632
This theorem is referenced by: (None)
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