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Theorem riotaexg 6032
Description: Restricted iota is a set. (Contributed by Jim Kingdon, 15-Jun-2020.)
Assertion
Ref Expression
riotaexg (𝐴𝑉 → (𝑥𝐴 𝜓) ∈ V)
Distinct variable group:   𝑥,𝐴
Allowed substitution hints:   𝜓(𝑥)   𝑉(𝑥)

Proof of Theorem riotaexg
StepHypRef Expression
1 df-riota 6028 . 2 (𝑥𝐴 𝜓) = (℩𝑥(𝑥𝐴𝜓))
2 uniexg 4580 . . 3 (𝐴𝑉 𝐴 ∈ V)
3 iotass 5350 . . . . 5 (∀𝑥((𝑥𝐴𝜓) → 𝑥 𝐴) → (℩𝑥(𝑥𝐴𝜓)) ⊆ 𝐴)
4 elssuni 3958 . . . . . 6 (𝑥𝐴𝑥 𝐴)
54adantr 276 . . . . 5 ((𝑥𝐴𝜓) → 𝑥 𝐴)
63, 5mpg 1504 . . . 4 (℩𝑥(𝑥𝐴𝜓)) ⊆ 𝐴
76a1i 9 . . 3 (𝐴𝑉 → (℩𝑥(𝑥𝐴𝜓)) ⊆ 𝐴)
82, 7ssexd 4268 . 2 (𝐴𝑉 → (℩𝑥(𝑥𝐴𝜓)) ∈ V)
91, 8eqeltrid 2325 1 (𝐴𝑉 → (𝑥𝐴 𝜓) ∈ V)
Colors of variables: wff set class
Syntax hints:  wi 4  wa 104  wcel 2209  Vcvv 2821  wss 3220   cuni 3930  cio 5330  crio 6027
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 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 4244  ax-un 4573
This theorem 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 3687  df-sn 3711  df-pr 3712  df-uni 3931  df-iota 5332  df-riota 6028
This theorem is referenced by:  iotaexel  6033  flval  10685  sqrtrval  11744  qnumval  12941  qdenval  12942  grpidvalg  13670  fn0g  13672  grpinvval  13825  grpinvfng  13826  usgredg2v  16379
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