Theorem resmpt 5091

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.

Step	Hyp	Ref	Expression
1		resopab2 5090	. 2 |- ( B C_ A -> ( { <. x , y >. | ( x e. A /\ y = C ) } |` B ) = { <. x , y >. | ( x e. B /\ y = C ) } )
2		df-mpt 4178	. . 3 |- ( x e. A |-> C ) = { <. x , y >. | ( x e. A /\ y = C ) }
3	2	reseq1i 5039	. 2 |- ( ( x e. A |-> C ) |` B ) = ( { <. x , y >. | ( x e. A /\ y = C ) } |` B )
4		df-mpt 4178	. 2 |- ( x e. B |-> C ) = { <. x , y >. | ( x e. B /\ y = C ) }
5	1, 3, 4	3eqtr4g 2292	1 |- ( B C_ A -> ( ( x e. A |-> C ) |` B ) = ( x e. B |-> C ) )

Syntax hints:   -> wi 4   /\ wa 104   = wceq 1398   e. wcel 2205   C_ wss 3214   {copab 4175   |-> cmpt 4176   |` cres 4756

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 717  ax-5 1496  ax-7 1497  ax-gen 1498  ax-ie1 1542  ax-ie2 1543  ax-8 1553  ax-10 1554  ax-11 1555  ax-i12 1556  ax-bndl 1558  ax-4 1559  ax-17 1575  ax-i9 1579  ax-ial 1583  ax-i5r 1584  ax-14 2208  ax-ext 2216  ax-sep 4233  ax-pow 4292  ax-pr 4327

This theorem depends on definitions:  df-bi 117  df-3an 1007  df-tru 1401  df-nf 1510  df-sb 1812  df-clab 2221  df-cleq 2227  df-clel 2230  df-nfc 2375  df-ral 2527  df-rex 2528  df-v 2817  df-un 3218  df-in 3220  df-ss 3227  df-pw 3676  df-sn 3700  df-pr 3701  df-op 3703  df-opab 4177  df-mpt 4178  df-xp 4760  df-rel 4761  df-res 4766

This theorem is referenced by:  resmpt3  5092  resmptf  5093  resmptd  5094  f1stres  6366  f2ndres  6367  tposss  6490  dftpos2  6505  dftpos4  6507  djuf1olemr  7358  fisumss  12103  isumclim3  12134  expcnv  12215  fprodssdc  12301  conjsubg  14030  gsumfzfsumlemm  14861  tgrest  15160  cnmptid  15272  hovercncf  15637  dvidlemap  15682  dvidrelem  15683  dvidsslem  15684  dvcnp2cntop  15690  dvmulxxbr  15693  dvcoapbr  15698  dvrecap  15704