Theorem cusgrexilem1 29730

Description: Lemma 1 for cusgrexi 29734. (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

Step	Hyp	Ref	Expression
1		usgrexi.p	. . 3 ⊢ 𝑃 = {𝑥 ∈ 𝒫 𝑉 ∣ (♯‘𝑥) = 2}
2		pwexg 5350	. . 3 ⊢ (𝑉 ∈ 𝑊 → 𝒫 𝑉 ∈ V)
3	1, 2	rabexd 5311	. 2 ⊢ (𝑉 ∈ 𝑊 → 𝑃 ∈ V)
4		resiexg 7909	. 2 ⊢ (𝑃 ∈ V → ( I ↾ 𝑃) ∈ V)
5	3, 4	syl 18	1 ⊢ (𝑉 ∈ 𝑊 → ( I ↾ 𝑃) ∈ V)

Syntax hints:   → wi 4   = wceq 1567   ∈ wcel 2149  {crab 3423  Vcvv 3463  𝒫 cpw 4567   I cid 5556   ↾ cres 5664  ‘cfv 6537  2c2 12295  ♯chash 14366

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1822  ax-4 1836  ax-5 1937  ax-6 1994  ax-7 2035  ax-8 2151  ax-9 2159  ax-ext 2741  ax-sep 5261  ax-pow 5337  ax-pr 5405  ax-un 7733

This theorem depends on definitions:  df-bi 210  df-an 401  df-or 861  df-3an 1103  df-tru 1570  df-fal 1580  df-ex 1807  df-sb 2098  df-clab 2748  df-cleq 2761  df-clel 2844  df-ral 3086  df-rex 3096  df-rab 3424  df-v 3465  df-dif 3916  df-un 3918  df-in 3920  df-ss 3930  df-nul 4295  df-if 4493  df-pw 4569  df-sn 4595  df-pr 4597  df-op 4601  df-uni 4877  df-br 5114  df-opab 5178  df-id 5557  df-xp 5668  df-rel 5669  df-res 5674

This theorem is referenced by:  usgrexi  29732  cusgrexi  29734  cusgrexg  29735  structtousgr  29736  structtocusgr  29737