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Theorem riotaexg 5802
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 5798 . 2  |-  ( iota_ x  e.  A  ps )  =  ( iota x
( x  e.  A  /\  ps ) )
2 uniexg 4417 . . 3  |-  ( A  e.  V  ->  U. A  e.  _V )
3 iotass 5170 . . . . 5  |-  ( A. x ( ( x  e.  A  /\  ps )  ->  x  C_  U. A
)  ->  ( iota x ( x  e.  A  /\  ps )
)  C_  U. A )
4 elssuni 3817 . . . . . 6  |-  ( x  e.  A  ->  x  C_ 
U. A )
54adantr 274 . . . . 5  |-  ( ( x  e.  A  /\  ps )  ->  x  C_  U. A )
63, 5mpg 1439 . . . 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 4122 . 2  |-  ( A  e.  V  ->  ( iota x ( x  e.  A  /\  ps )
)  e.  _V )
91, 8eqeltrid 2253 1  |-  ( A  e.  V  ->  ( iota_ x  e.  A  ps )  e.  _V )
Colors of variables: wff set class
Syntax hints:    -> wi 4    /\ wa 103    e. wcel 2136   _Vcvv 2726    C_ wss 3116   U.cuni 3789   iotacio 5151   iota_crio 5797
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-io 699  ax-5 1435  ax-7 1436  ax-gen 1437  ax-ie1 1481  ax-ie2 1482  ax-8 1492  ax-10 1493  ax-11 1494  ax-i12 1495  ax-bndl 1497  ax-4 1498  ax-17 1514  ax-i9 1518  ax-ial 1522  ax-i5r 1523  ax-13 2138  ax-14 2139  ax-ext 2147  ax-sep 4100  ax-un 4411
This theorem depends on definitions:  df-bi 116  df-tru 1346  df-nf 1449  df-sb 1751  df-clab 2152  df-cleq 2158  df-clel 2161  df-nfc 2297  df-ral 2449  df-rex 2450  df-v 2728  df-un 3120  df-in 3122  df-ss 3129  df-pw 3561  df-sn 3582  df-pr 3583  df-uni 3790  df-iota 5153  df-riota 5798
This theorem is referenced by:  flval  10207  sqrtrval  10942  qnumval  12117  qdenval  12118  grpidvalg  12604  fn0g  12606
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