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Theorem cusgrexilem1 29388
Description: Lemma 1 for cusgrexi 29392. (Contributed by Alexander van der Vekens, 12-Jan-2018.)
Hypothesis
Ref Expression
usgrexi.p 𝑃 = {𝑥 ∈ 𝒫 𝑉 ∣ (♯‘𝑥) = 2}
Assertion
Ref Expression
cusgrexilem1 (𝑉𝑊 → ( I ↾ 𝑃) ∈ V)
Distinct variable group:   𝑥,𝑉
Allowed substitution hints:   𝑃(𝑥)   𝑊(𝑥)

Proof of Theorem cusgrexilem1
StepHypRef Expression
1 usgrexi.p . . 3 𝑃 = {𝑥 ∈ 𝒫 𝑉 ∣ (♯‘𝑥) = 2}
2 pwexg 5317 . . 3 (𝑉𝑊 → 𝒫 𝑉 ∈ V)
31, 2rabexd 5279 . 2 (𝑉𝑊𝑃 ∈ V)
4 resiexg 7845 . 2 (𝑃 ∈ V → ( I ↾ 𝑃) ∈ V)
53, 4syl 17 1 (𝑉𝑊 → ( I ↾ 𝑃) ∈ V)
Colors of variables: wff setvar class
Syntax hints:  wi 4   = wceq 1540  wcel 2109  {crab 3394  Vcvv 3436  𝒫 cpw 4551   I cid 5513  cres 5621  cfv 6482  2c2 12183  chash 14237
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1795  ax-4 1809  ax-5 1910  ax-6 1967  ax-7 2008  ax-8 2111  ax-9 2119  ax-ext 2701  ax-sep 5235  ax-nul 5245  ax-pow 5304  ax-pr 5371  ax-un 7671
This theorem depends on definitions:  df-bi 207  df-an 396  df-or 848  df-3an 1088  df-tru 1543  df-fal 1553  df-ex 1780  df-sb 2066  df-clab 2708  df-cleq 2721  df-clel 2803  df-ral 3045  df-rex 3054  df-rab 3395  df-v 3438  df-dif 3906  df-un 3908  df-in 3910  df-ss 3920  df-nul 4285  df-if 4477  df-pw 4553  df-sn 4578  df-pr 4580  df-op 4584  df-uni 4859  df-br 5093  df-opab 5155  df-id 5514  df-xp 5625  df-rel 5626  df-res 5631
This theorem is referenced by:  usgrexi  29390  cusgrexi  29392  cusgrexg  29393  structtousgr  29394  structtocusgr  29395
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