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Theorem cusgrexilem1 30020
Description: Lemma 1 for cusgrexi 30024. (Contributed by Alexander van der Vekens, 12-Jan-2018.)
Hypothesis
Ref Expression
usgrexi.p 𝑃 = {𝑥 ∈ 𝒫 𝑉 ∣ (♯‘𝑥) = 2}
Assertion
Ref Expression
cusgrexilem1 (𝑉 ∈ 𝑊 → ( 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 5339 . . 3 (𝑉 ∈ 𝑊 → 𝒫 𝑉 ∈ V)
31, 2rabexd 5300 . 2 (𝑉 ∈ 𝑊 → 𝑃 ∈ V)
4 resiexg 7924 . 2 (𝑃 ∈ V → ( I ↾ 𝑃) ∈ V)
53, 4syl 18 1 (𝑉 ∈ 𝑊 → ( I ↾ 𝑃) ∈ V)
Colors of variables:    wff setvar class
This proof depends on syntax axioms:   → wi 4   = wceq 1569   ∈ wcel 2144  {crab 3412  Vcvv 3450  𝒫 cpw 4556   I cid 5544   ↾ cres 5652  ‘cfv 6538  2c2 12397  ♯chash 14474
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1827  ax-4 1841  ax-5 1942  ax-6 1999  ax-7 2040  ax-8 2146  ax-9 2154  ax-ext 2732  ax-sep 5248  ax-pow 5326  ax-pr 5390  ax-un 7751
This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3an 1105  df-tru 1572  df-fal 1582  df-ex 1812  df-sb 2099  df-clab 2739  df-cleq 2752  df-clel 2835  df-ral 3077  df-rex 3087  df-rab 3413  df-v 3452  df-ss 3896  df-dif 4047  df-in 4091  df-un 4151  df-nul 4279  df-if 4482  df-pw 4558  df-sn 4584  df-pr 4586  df-op 4590  df-uni 4867  df-br 5103  df-opab 5167  df-id 5545  df-xp 5656  df-rel 5657  df-res 5662
This theorem is used by:  usgrexi  30022  cusgrexi  30024  cusgrexg  30025  structtousgr  30026  structtocusgr  30027
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