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Theorem riotaexg 6007
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 6003 . 2 (𝑥𝐴 𝜓) = (℩𝑥(𝑥𝐴𝜓))
2 uniexg 4560 . . 3 (𝐴𝑉 𝐴 ∈ V)
3 iotass 5330 . . . . 5 (∀𝑥((𝑥𝐴𝜓) → 𝑥 𝐴) → (℩𝑥(𝑥𝐴𝜓)) ⊆ 𝐴)
4 elssuni 3942 . . . . . 6 (𝑥𝐴𝑥 𝐴)
54adantr 276 . . . . 5 ((𝑥𝐴𝜓) → 𝑥 𝐴)
63, 5mpg 1500 . . . 4 (℩𝑥(𝑥𝐴𝜓)) ⊆ 𝐴
76a1i 9 . . 3 (𝐴𝑉 → (℩𝑥(𝑥𝐴𝜓)) ⊆ 𝐴)
82, 7ssexd 4250 . 2 (𝐴𝑉 → (℩𝑥(𝑥𝐴𝜓)) ∈ V)
91, 8eqeltrid 2319 1 (𝐴𝑉 → (𝑥𝐴 𝜓) ∈ V)
Colors of variables: wff set class
Syntax hints:  wi 4  wa 104  wcel 2203  Vcvv 2813  wss 3211   cuni 3914  cio 5310  crio 6002
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 717  ax-5 1496  ax-7 1497  ax-gen 1498  ax-ie1 1542  ax-ie2 1543  ax-8 1553  ax-10 1554  ax-11 1555  ax-i12 1556  ax-bndl 1558  ax-4 1559  ax-17 1575  ax-i9 1579  ax-ial 1583  ax-i5r 1584  ax-13 2205  ax-14 2206  ax-ext 2214  ax-sep 4228  ax-un 4554
This theorem depends on definitions:  df-bi 117  df-tru 1401  df-nf 1510  df-sb 1812  df-clab 2219  df-cleq 2225  df-clel 2228  df-nfc 2373  df-ral 2525  df-rex 2526  df-v 2815  df-un 3215  df-in 3217  df-ss 3224  df-pw 3671  df-sn 3695  df-pr 3696  df-uni 3915  df-iota 5312  df-riota 6003
This theorem is referenced by:  iotaexel  6008  flval  10632  sqrtrval  11685  qnumval  12882  qdenval  12883  grpidvalg  13586  fn0g  13588  grpinvval  13756  grpinvfng  13757  usgredg2v  16219
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