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Theorem trlsegvdeglem3 30424
Description: Lemma for trlsegvdeg 30429. (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 6880 . . . 4 (𝐹𝑁) ∈ V
2 fvex 6880 . . . 4 (𝐼‘(𝐹𝑁)) ∈ V
31, 2pm3.2i 474 . . 3 ((𝐹𝑁) ∈ V ∧ (𝐼‘(𝐹𝑁)) ∈ V)
4 funsng 6572 . . 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 6543 . 2 (𝜑 → (Fun (iEdg‘𝑌) ↔ Fun {⟨(𝐹𝑁), (𝐼‘(𝐹𝑁))⟩}))
85, 7mpbird 259 1 (𝜑 → Fun (iEdg‘𝑌))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wa 399   = wceq 1560  wcel 2142  Vcvv 3454  {csn 4582  cop 4588   class class class wbr 5100  cres 5649  cima 5650  Fun wfun 6515  cfv 6521  (class class class)co 7396  0cc0 11073  ...cfz 13512  ..^cfzo 13659  chash 14343  Vtxcvtx 29197  iEdgciedg 29198  Trailsctrls 29889
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1815  ax-4 1829  ax-5 1930  ax-6 1987  ax-7 2028  ax-8 2144  ax-9 2152  ax-ext 2734  ax-sep 5246  ax-nul 5256  ax-pr 5390
This theorem depends on definitions:  df-bi 209  df-an 400  df-or 859  df-3an 1100  df-tru 1563  df-fal 1573  df-ex 1800  df-sb 2091  df-mo 2566  df-clab 2741  df-cleq 2754  df-clel 2837  df-ne 2958  df-ral 3077  df-rex 3087  df-rab 3415  df-v 3456  df-dif 3907  df-un 3909  df-in 3911  df-ss 3921  df-nul 4286  df-if 4481  df-sn 4583  df-pr 4585  df-op 4589  df-uni 4866  df-br 5101  df-opab 5163  df-id 5542  df-xp 5653  df-rel 5654  df-cnv 5655  df-co 5656  df-iota 6477  df-fun 6523  df-fv 6529
This theorem is referenced by:  trlsegvdeg  30429
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