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Theorem restfn 13271
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 13269 . 2  |-t  =  ( j  e.  _V ,  x  e. 
_V  |->  ran  ( y  e.  j  |->  ( y  i^i  x ) ) )
2 vex 2802 . . . 4  |-  j  e. 
_V
32mptex 5864 . . 3  |-  ( y  e.  j  |->  ( y  i^i  x ) )  e.  _V
43rnex 4991 . 2  |-  ran  (
y  e.  j  |->  ( y  i^i  x ) )  e.  _V
51, 4fnmpoi 6347 1  |-t  Fn  ( _V  X.  _V )
Colors of variables: wff set class
Syntax hints:   _Vcvv 2799    i^i cin 3196    |-> cmpt 4144    X. cxp 4716   ran crn 4719    Fn wfn 5312   ↾t crest 13267
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 714  ax-5 1493  ax-7 1494  ax-gen 1495  ax-ie1 1539  ax-ie2 1540  ax-8 1550  ax-10 1551  ax-11 1552  ax-i12 1553  ax-bndl 1555  ax-4 1556  ax-17 1572  ax-i9 1576  ax-ial 1580  ax-i5r 1581  ax-13 2202  ax-14 2203  ax-ext 2211  ax-coll 4198  ax-sep 4201  ax-pow 4257  ax-pr 4292  ax-un 4523
This theorem depends on definitions:  df-bi 117  df-3an 1004  df-tru 1398  df-nf 1507  df-sb 1809  df-eu 2080  df-mo 2081  df-clab 2216  df-cleq 2222  df-clel 2225  df-nfc 2361  df-ral 2513  df-rex 2514  df-reu 2515  df-rab 2517  df-v 2801  df-sbc 3029  df-csb 3125  df-un 3201  df-in 3203  df-ss 3210  df-pw 3651  df-sn 3672  df-pr 3673  df-op 3675  df-uni 3888  df-iun 3966  df-br 4083  df-opab 4145  df-mpt 4146  df-id 4383  df-xp 4724  df-rel 4725  df-cnv 4726  df-co 4727  df-dm 4728  df-rn 4729  df-res 4730  df-ima 4731  df-iota 5277  df-fun 5319  df-fn 5320  df-f 5321  df-f1 5322  df-fo 5323  df-f1o 5324  df-fv 5325  df-oprab 6004  df-mpo 6005  df-1st 6284  df-2nd 6285  df-rest 13269
This theorem is referenced by:  topnfn  13272  topnvalg  13279  restbasg  14836  tgrest  14837  restco  14842  txrest  14944
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