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Theorem restfn 13325
Description: The subspace topology operator is a function on pairs. (Contributed by Mario Carneiro, 1-May-2015.)
Assertion
Ref Expression
restfn  |-t  Fn  ( _V  X.  _V )

Proof of Theorem restfn
Dummy variables  x  j  y are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 df-rest 13323 . 2  |-t  =  ( j  e.  _V ,  x  e. 
_V  |->  ran  ( y  e.  j  |->  ( y  i^i  x ) ) )
2 vex 2805 . . . 4  |-  j  e. 
_V
32mptex 5879 . . 3  |-  ( y  e.  j  |->  ( y  i^i  x ) )  e.  _V
43rnex 5000 . 2  |-  ran  (
y  e.  j  |->  ( y  i^i  x ) )  e.  _V
51, 4fnmpoi 6367 1  |-t  Fn  ( _V  X.  _V )
Colors of variables: wff set class
Syntax hints:   _Vcvv 2802    i^i cin 3199    |-> cmpt 4150    X. cxp 4723   ran crn 4726    Fn wfn 5321   ↾t crest 13321
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 716  ax-5 1495  ax-7 1496  ax-gen 1497  ax-ie1 1541  ax-ie2 1542  ax-8 1552  ax-10 1553  ax-11 1554  ax-i12 1555  ax-bndl 1557  ax-4 1558  ax-17 1574  ax-i9 1578  ax-ial 1582  ax-i5r 1583  ax-13 2204  ax-14 2205  ax-ext 2213  ax-coll 4204  ax-sep 4207  ax-pow 4264  ax-pr 4299  ax-un 4530
This theorem depends on definitions:  df-bi 117  df-3an 1006  df-tru 1400  df-nf 1509  df-sb 1811  df-eu 2082  df-mo 2083  df-clab 2218  df-cleq 2224  df-clel 2227  df-nfc 2363  df-ral 2515  df-rex 2516  df-reu 2517  df-rab 2519  df-v 2804  df-sbc 3032  df-csb 3128  df-un 3204  df-in 3206  df-ss 3213  df-pw 3654  df-sn 3675  df-pr 3676  df-op 3678  df-uni 3894  df-iun 3972  df-br 4089  df-opab 4151  df-mpt 4152  df-id 4390  df-xp 4731  df-rel 4732  df-cnv 4733  df-co 4734  df-dm 4735  df-rn 4736  df-res 4737  df-ima 4738  df-iota 5286  df-fun 5328  df-fn 5329  df-f 5330  df-f1 5331  df-fo 5332  df-f1o 5333  df-fv 5334  df-oprab 6021  df-mpo 6022  df-1st 6302  df-2nd 6303  df-rest 13323
This theorem is referenced by:  topnfn  13326  topnvalg  13333  restbasg  14891  tgrest  14892  restco  14897  txrest  14999
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