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Theorem trlsegvdeglem3 30267
Description: Lemma for trlsegvdeg 30272. (Contributed by AV, 20-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
trlsegvdeglem3 (𝜑 → Fun (iEdg‘𝑌))

Proof of Theorem trlsegvdeglem3
StepHypRef Expression
1 fvex 6927 . . . 4 (𝐹𝑁) ∈ V
2 fvex 6927 . . . 4 (𝐼‘(𝐹𝑁)) ∈ V
31, 2pm3.2i 470 . . 3 ((𝐹𝑁) ∈ V ∧ (𝐼‘(𝐹𝑁)) ∈ V)
4 funsng 6625 . . 3 (((𝐹𝑁) ∈ V ∧ (𝐼‘(𝐹𝑁)) ∈ V) → Fun {⟨(𝐹𝑁), (𝐼‘(𝐹𝑁))⟩})
53, 4mp1i 13 . 2 (𝜑 → Fun {⟨(𝐹𝑁), (𝐼‘(𝐹𝑁))⟩})
6 trlsegvdeg.iy . . 3 (𝜑 → (iEdg‘𝑌) = {⟨(𝐹𝑁), (𝐼‘(𝐹𝑁))⟩})
76funeqd 6596 . 2 (𝜑 → (Fun (iEdg‘𝑌) ↔ Fun {⟨(𝐹𝑁), (𝐼‘(𝐹𝑁))⟩}))
85, 7mpbird 257 1 (𝜑 → Fun (iEdg‘𝑌))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wa 395   = wceq 1539  wcel 2108  Vcvv 3481  {csn 4634  cop 4640   class class class wbr 5151  cres 5695  cima 5696  Fun wfun 6563  cfv 6569  (class class class)co 7438  0cc0 11162  ...cfz 13553  ..^cfzo 13700  chash 14375  Vtxcvtx 29039  iEdgciedg 29040  Trailsctrls 29734
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1794  ax-4 1808  ax-5 1910  ax-6 1967  ax-7 2007  ax-8 2110  ax-9 2118  ax-ext 2708  ax-sep 5305  ax-nul 5315  ax-pr 5441
This theorem depends on definitions:  df-bi 207  df-an 396  df-or 849  df-3an 1089  df-tru 1542  df-fal 1552  df-ex 1779  df-sb 2065  df-mo 2540  df-clab 2715  df-cleq 2729  df-clel 2816  df-ne 2941  df-ral 3062  df-rex 3071  df-rab 3437  df-v 3483  df-dif 3969  df-un 3971  df-ss 3983  df-nul 4343  df-if 4535  df-sn 4635  df-pr 4637  df-op 4641  df-uni 4916  df-br 5152  df-opab 5214  df-id 5587  df-xp 5699  df-rel 5700  df-cnv 5701  df-co 5702  df-iota 6522  df-fun 6571  df-fv 6577
This theorem is referenced by:  trlsegvdeg  30272
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