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Theorem trlsegvdeglem5 30168
Description: Lemma for trlsegvdeg 30171. (Contributed by AV, 21-Feb-2021.)
Hypotheses
Ref Expression
trlsegvdeg.v 𝑉 = (Vtx‘𝐺)
trlsegvdeg.i 𝐼 = (iEdg‘𝐺)
trlsegvdeg.f (𝜑 → Fun 𝐼)
trlsegvdeg.n (𝜑𝑁 ∈ (0..^(♯‘𝐹)))
trlsegvdeg.u (𝜑𝑈𝑉)
trlsegvdeg.w (𝜑𝐹(Trails‘𝐺)𝑃)
trlsegvdeg.vx (𝜑 → (Vtx‘𝑋) = 𝑉)
trlsegvdeg.vy (𝜑 → (Vtx‘𝑌) = 𝑉)
trlsegvdeg.vz (𝜑 → (Vtx‘𝑍) = 𝑉)
trlsegvdeg.ix (𝜑 → (iEdg‘𝑋) = (𝐼 ↾ (𝐹 “ (0..^𝑁))))
trlsegvdeg.iy (𝜑 → (iEdg‘𝑌) = {⟨(𝐹𝑁), (𝐼‘(𝐹𝑁))⟩})
trlsegvdeg.iz (𝜑 → (iEdg‘𝑍) = (𝐼 ↾ (𝐹 “ (0...𝑁))))
Assertion
Ref Expression
trlsegvdeglem5 (𝜑 → dom (iEdg‘𝑌) = {(𝐹𝑁)})

Proof of Theorem trlsegvdeglem5
StepHypRef Expression
1 trlsegvdeg.iy . . 3 (𝜑 → (iEdg‘𝑌) = {⟨(𝐹𝑁), (𝐼‘(𝐹𝑁))⟩})
21dmeqd 5848 . 2 (𝜑 → dom (iEdg‘𝑌) = dom {⟨(𝐹𝑁), (𝐼‘(𝐹𝑁))⟩})
3 fvex 6835 . . 3 (𝐼‘(𝐹𝑁)) ∈ V
4 dmsnopg 6162 . . 3 ((𝐼‘(𝐹𝑁)) ∈ V → dom {⟨(𝐹𝑁), (𝐼‘(𝐹𝑁))⟩} = {(𝐹𝑁)})
53, 4mp1i 13 . 2 (𝜑 → dom {⟨(𝐹𝑁), (𝐼‘(𝐹𝑁))⟩} = {(𝐹𝑁)})
62, 5eqtrd 2764 1 (𝜑 → dom (iEdg‘𝑌) = {(𝐹𝑁)})
Colors of variables: wff setvar class
Syntax hints:  wi 4   = wceq 1540  wcel 2109  Vcvv 3436  {csn 4577  cop 4583   class class class wbr 5092  dom cdm 5619  cres 5621  cima 5622  Fun wfun 6476  cfv 6482  (class class class)co 7349  0cc0 11009  ...cfz 13410  ..^cfzo 13557  chash 14237  Vtxcvtx 28941  iEdgciedg 28942  Trailsctrls 29634
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-pr 5371
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-ne 2926  df-rab 3395  df-v 3438  df-dif 3906  df-un 3908  df-ss 3920  df-nul 4285  df-if 4477  df-sn 4578  df-pr 4580  df-op 4584  df-uni 4859  df-br 5093  df-dm 5629  df-iota 6438  df-fv 6490
This theorem is referenced by:  trlsegvdeglem7  30170  trlsegvdeg  30171
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