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Theorem cusgrexilem1 30047
Description: Lemma 1 for cusgrexi 30051. (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 5344 . . 3 (𝑉 ∈ 𝑊 → 𝒫 𝑉 ∈ V)
31, 2rabexd 5305 . 2 (𝑉 ∈ 𝑊 → 𝑃 ∈ V)
4 resiexg 7945 . 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 1570   ∈ wcel 2147  {crab 3416  Vcvv 3454  𝒫 cpw 4560   I cid 5549   ↾ cres 5657  ‘cfv 6555  2c2 12421  ♯chash 14498
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1828  ax-4 1842  ax-5 1945  ax-6 2002  ax-7 2043  ax-8 2149  ax-9 2157  ax-ext 2735  ax-sep 5252  ax-pow 5331  ax-pr 5395  ax-un 7772
This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1813  df-sb 2102  df-clab 2742  df-cleq 2755  df-clel 2839  df-ral 3081  df-rex 3091  df-rab 3417  df-v 3456  df-ss 3901  df-dif 4050  df-in 4094  df-un 4154  df-nul 4282  df-if 4486  df-pw 4562  df-sn 4589  df-pr 4591  df-op 4839  df-uni 4871  df-br 5107  df-opab 5171  df-id 5550  df-xp 5661  df-rel 5662  df-res 5667
This theorem is used by:  usgrexi  30049  cusgrexi  30051  cusgrexg  30052  structtousgr  30053  structtocusgr  30054
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