Theorem uhgrspan1lem1 28554

Description: Lemma 1 for uhgrspan1 28557. (Contributed by AV, 19-Nov-2020.)

Hypotheses

Ref	Expression
uhgrspan1.v	⊢ 𝑉 = (Vtx‘𝐺)
uhgrspan1.i	⊢ 𝐼 = (iEdg‘𝐺)
uhgrspan1.f	⊢ 𝐹 = {𝑖 ∈ dom 𝐼 ∣ 𝑁 ∉ (𝐼‘𝑖)}

Assertion

Ref	Expression
uhgrspan1lem1	⊢ ((𝑉 ∖ {𝑁}) ∈ V ∧ (𝐼 ↾ 𝐹) ∈ V)

Proof of Theorem uhgrspan1lem1

Step	Hyp	Ref	Expression
1		uhgrspan1.v	. . . 4 ⊢ 𝑉 = (Vtx‘𝐺)
2	1	fvexi 6905	. . 3 ⊢ 𝑉 ∈ V
3	2	difexi 5328	. 2 ⊢ (𝑉 ∖ {𝑁}) ∈ V
4		uhgrspan1.i	. . . 4 ⊢ 𝐼 = (iEdg‘𝐺)
5	4	fvexi 6905	. . 3 ⊢ 𝐼 ∈ V
6	5	resex 6029	. 2 ⊢ (𝐼 ↾ 𝐹) ∈ V
7	3, 6	pm3.2i 471	1 ⊢ ((𝑉 ∖ {𝑁}) ∈ V ∧ (𝐼 ↾ 𝐹) ∈ V)

Syntax hints:   ∧ wa 396   = wceq 1541   ∈ wcel 2106   ∉ wnel 3046  {crab 3432  Vcvv 3474   ∖ cdif 3945  {csn 4628  dom cdm 5676   ↾ cres 5678  ‘cfv 6543  Vtxcvtx 28253  iEdgciedg 28254

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1797  ax-4 1811  ax-5 1913  ax-6 1971  ax-7 2011  ax-8 2108  ax-9 2116  ax-ext 2703  ax-sep 5299  ax-nul 5306

This theorem depends on definitions:  df-bi 206  df-an 397  df-or 846  df-tru 1544  df-fal 1554  df-ex 1782  df-sb 2068  df-clab 2710  df-cleq 2724  df-clel 2810  df-ne 2941  df-rab 3433  df-v 3476  df-dif 3951  df-un 3953  df-in 3955  df-ss 3965  df-nul 4323  df-sn 4629  df-pr 4631  df-uni 4909  df-res 5688  df-iota 6495  df-fv 6551

This theorem is referenced by:  uhgrspan1lem2  28555  uhgrspan1lem3  28556