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Theorem resmpo 5877
Description: Restriction of the mapping operation. (Contributed by Mario Carneiro, 17-Dec-2013.)
Assertion
Ref Expression
resmpo  |-  ( ( C  C_  A  /\  D  C_  B )  -> 
( ( x  e.  A ,  y  e.  B  |->  E )  |`  ( C  X.  D
) )  =  ( x  e.  C , 
y  e.  D  |->  E ) )
Distinct variable groups:    x, A, y   
x, B, y    x, C, y    x, D, y
Allowed substitution hints:    E( x, y)

Proof of Theorem resmpo
Dummy variable  z is distinct from all other variables.
StepHypRef Expression
1 resoprab2 5876 . 2  |-  ( ( C  C_  A  /\  D  C_  B )  -> 
( { <. <. x ,  y >. ,  z
>.  |  ( (
x  e.  A  /\  y  e.  B )  /\  z  =  E
) }  |`  ( C  X.  D ) )  =  { <. <. x ,  y >. ,  z
>.  |  ( (
x  e.  C  /\  y  e.  D )  /\  z  =  E
) } )
2 df-mpo 5787 . . 3  |-  ( x  e.  A ,  y  e.  B  |->  E )  =  { <. <. x ,  y >. ,  z
>.  |  ( (
x  e.  A  /\  y  e.  B )  /\  z  =  E
) }
32reseq1i 4823 . 2  |-  ( ( x  e.  A , 
y  e.  B  |->  E )  |`  ( C  X.  D ) )  =  ( { <. <. x ,  y >. ,  z
>.  |  ( (
x  e.  A  /\  y  e.  B )  /\  z  =  E
) }  |`  ( C  X.  D ) )
4 df-mpo 5787 . 2  |-  ( x  e.  C ,  y  e.  D  |->  E )  =  { <. <. x ,  y >. ,  z
>.  |  ( (
x  e.  C  /\  y  e.  D )  /\  z  =  E
) }
51, 3, 43eqtr4g 2198 1  |-  ( ( C  C_  A  /\  D  C_  B )  -> 
( ( x  e.  A ,  y  e.  B  |->  E )  |`  ( C  X.  D
) )  =  ( x  e.  C , 
y  e.  D  |->  E ) )
Colors of variables: wff set class
Syntax hints:    -> wi 4    /\ wa 103    = wceq 1332    e. wcel 1481    C_ wss 3076    X. cxp 4545    |` cres 4549   {coprab 5783    e. cmpo 5784
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-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-opab 3998  df-xp 4553  df-rel 4554  df-res 4559  df-oprab 5786  df-mpo 5787
This theorem is referenced by:  ofmres  6042  divfnzn  9440  txss12  12474  txbasval  12475  cnmpt2res  12505
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