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Theorem trlsegvdeglem4 30311
Description: Lemma for trlsegvdeg 30315. (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
trlsegvdeglem4 (𝜑 → dom (iEdg‘𝑋) = ((𝐹 “ (0..^𝑁)) ∩ dom 𝐼))

Proof of Theorem trlsegvdeglem4
StepHypRef Expression
1 trlsegvdeg.ix . . 3 (𝜑 → (iEdg‘𝑋) = (𝐼 ↾ (𝐹 “ (0..^𝑁))))
21dmeqd 5847 . 2 (𝜑 → dom (iEdg‘𝑋) = dom (𝐼 ↾ (𝐹 “ (0..^𝑁))))
3 dmres 5964 . 2 dom (𝐼 ↾ (𝐹 “ (0..^𝑁))) = ((𝐹 “ (0..^𝑁)) ∩ dom 𝐼)
42, 3eqtrdi 2790 1 (𝜑 → dom (iEdg‘𝑋) = ((𝐹 “ (0..^𝑁)) ∩ dom 𝐼))
Colors of variables: wff setvar class
Syntax hints:  wi 4   = wceq 1547  wcel 2119  cin 3882  {csn 4555  cop 4561   class class class wbr 5072  dom cdm 5618  cres 5620  cima 5621  Fun wfun 6479  cfv 6485  (class class class)co 7356  0cc0 11029  ...cfz 13452  ..^cfzo 13599  chash 14283  Vtxcvtx 29083  iEdgciedg 29084  Trailsctrls 29775
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1802  ax-4 1816  ax-5 1917  ax-6 1974  ax-7 2015  ax-8 2121  ax-9 2129  ax-ext 2711  ax-sep 5218  ax-pr 5362
This theorem depends on definitions:  df-bi 208  df-an 397  df-or 854  df-3an 1094  df-tru 1550  df-fal 1560  df-ex 1787  df-sb 2074  df-clab 2718  df-cleq 2731  df-clel 2814  df-ral 3054  df-rex 3064  df-rab 3392  df-v 3433  df-dif 3886  df-un 3888  df-in 3890  df-ss 3900  df-nul 4262  df-if 4455  df-sn 4556  df-pr 4558  df-op 4562  df-br 5073  df-opab 5135  df-xp 5624  df-dm 5628  df-res 5630
This theorem is referenced by:  trlsegvdeglem6  30313  trlsegvdeg  30315
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