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Theorem riotaexg 6042
Description: Restricted iota is a set. (Contributed by Jim Kingdon, 15-Jun-2020.)
Assertion
Ref Expression
riotaexg  |-  ( A  e.  V  ->  ( iota_ x  e.  A  ps )  e.  _V )
Distinct variable group:    x, A
Allowed substitution hints:    ps( x)    V( x)

Proof of Theorem riotaexg
StepHypRef Expression
1 df-riota 6038 . 2  |-  ( iota_ x  e.  A  ps )  =  ( iota x
( x  e.  A  /\  ps ) )
2 uniexg 4585 . . 3  |-  ( A  e.  V  ->  U. A  e.  _V )
3 iotass 5355 . . . . 5  |-  ( A. x ( ( x  e.  A  /\  ps )  ->  x  C_  U. A
)  ->  ( iota x ( x  e.  A  /\  ps )
)  C_  U. A )
4 elssuni 3963 . . . . . 6  |-  ( x  e.  A  ->  x  C_ 
U. A )
54adantr 276 . . . . 5  |-  ( ( x  e.  A  /\  ps )  ->  x  C_  U. A )
63, 5mpg 1504 . . . 4  |-  ( iota
x ( x  e.  A  /\  ps )
)  C_  U. A
76a1i 9 . . 3  |-  ( A  e.  V  ->  ( iota x ( x  e.  A  /\  ps )
)  C_  U. A )
82, 7ssexd 4273 . 2  |-  ( A  e.  V  ->  ( iota x ( x  e.  A  /\  ps )
)  e.  _V )
91, 8eqeltrid 2325 1  |-  ( A  e.  V  ->  ( iota_ x  e.  A  ps )  e.  _V )
Colors of variables:    wff set class
This proof depends on syntax axioms:    -> wi 4    /\ wa 104    e. wcel 2209   _Vcvv 2821    C_ wss 3220   U.cuni 3935   iotacio 5335   iota_crio 6037
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-un 4578
This proof depends on definitions:  df-bi 117  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-uni 3936  df-iota 5337  df-riota 6038
This theorem is used by:  iotaexel  6043  flval  10707  sqrtrval  11766  qnumval  12963  qdenval  12964  grpidvalg  13693  fn0g  13695  grpinvval  13848  grpinvfng  13849  usgredg2v  16465
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