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Theorem resmpt 5111
Description: Restriction of the mapping operation. (Contributed by Mario Carneiro, 15-Jul-2013.)
Assertion
Ref Expression
resmpt  |-  ( B 
C_  A  ->  (
( x  e.  A  |->  C )  |`  B )  =  ( x  e.  B  |->  C ) )
Distinct variable groups:    x, A    x, B
Allowed substitution hint:    C( x)

Proof of Theorem resmpt
Dummy variable  y is distinct from all other variables.
StepHypRef Expression
1 resopab2 5110 . 2  |-  ( B 
C_  A  ->  ( { <. x ,  y
>.  |  ( x  e.  A  /\  y  =  C ) }  |`  B )  =  { <. x ,  y >.  |  ( x  e.  B  /\  y  =  C ) } )
2 df-mpt 4194 . . 3  |-  ( x  e.  A  |->  C )  =  { <. x ,  y >.  |  ( x  e.  A  /\  y  =  C ) }
32reseq1i 5059 . 2  |-  ( ( x  e.  A  |->  C )  |`  B )  =  ( { <. x ,  y >.  |  ( x  e.  A  /\  y  =  C ) }  |`  B )
4 df-mpt 4194 . 2  |-  ( x  e.  B  |->  C )  =  { <. x ,  y >.  |  ( x  e.  B  /\  y  =  C ) }
51, 3, 43eqtr4g 2296 1  |-  ( B 
C_  A  ->  (
( x  e.  A  |->  C )  |`  B )  =  ( x  e.  B  |->  C ) )
Colors of variables:    wff set class
This proof depends on syntax axioms:    -> wi 4    /\ wa 104    = wceq 1402    e. wcel 2209    C_ wss 3220   {copab 4191    |-> cmpt 4192    |` cres 4776
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-io 721  ax-5 1500  ax-7 1501  ax-gen 1502  ax-ie1 1546  ax-ie2 1547  ax-8 1557  ax-10 1558  ax-11 1559  ax-i12 1560  ax-bndl 1562  ax-4 1563  ax-17 1579  ax-i9 1583  ax-ial 1587  ax-i5r 1588  ax-14 2212  ax-ext 2220  ax-sep 4249  ax-pow 4311  ax-pr 4346
This proof depends on definitions:  df-bi 117  df-3an 1011  df-tru 1405  df-nf 1514  df-sb 1816  df-clab 2225  df-cleq 2231  df-clel 2234  df-nfc 2381  df-ral 2533  df-rex 2534  df-v 2823  df-un 3224  df-in 3226  df-ss 3233  df-pw 3690  df-sn 3715  df-pr 3716  df-op 3718  df-opab 4193  df-mpt 4194  df-xp 4780  df-rel 4781  df-res 4786
This theorem is used by:  resmpt3  5112  resmptf  5113  resmptd  5114  f1stres  6393  f2ndres  6394  tposss  6517  dftpos2  6532  dftpos4  6534  djuf1olemr  7394  fisumss  12159  isumclim3  12190  expcnv  12271  fprodssdc  12357  conjsubg  14080  gsummptfidmadd  14161  gsumconstcmn  14166  tgrest  15270  cnmptid  15382  hovercncf  15747  dvidlemap  15792  dvidrelem  15793  dvidsslem  15794  dvcnp2cntop  15800  dvmulxxbr  15803  dvcoapbr  15808  dvrecap  15814
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