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Theorem trlsegvdeglem2 16907
Description: Lemma for trlsegvdeg . (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 (𝜑 → 𝑁 ∈ (0..^(♯‘𝐹)))
trlsegvdeg.u (𝜑 → 𝑈 ∈ 𝑉)
trlsegvdeg.w (𝜑 → 𝐹(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) = {⟨(𝐹‘𝑁), (𝐼‘(𝐹‘𝑁))⟩})
trlsegvdeg.iz (𝜑 → (iEdg‘𝑍) = (𝐼 ↾ (𝐹 “ (0...𝑁))))
Assertion
Ref Expression
trlsegvdeglem2 (𝜑 → Fun (iEdg‘𝑋))

Proof of Theorem trlsegvdeglem2
StepHypRef Expression
1 trlsegvdeg.f . . 3 (𝜑 → Fun 𝐼)
21funresd 5422 . 2 (𝜑 → Fun (𝐼 ↾ (𝐹 “ (0..^𝑁))))
3 trlsegvdeg.ix . . 3 (𝜑 → (iEdg‘𝑋) = (𝐼 ↾ (𝐹 “ (0..^𝑁))))
43funeqd 5402 . 2 (𝜑 → (Fun (iEdg‘𝑋) ↔ Fun (𝐼 ↾ (𝐹 “ (0..^𝑁)))))
52, 4mpbird 167 1 (𝜑 → Fun (iEdg‘𝑋))
Colors of variables:    wff set class
This proof depends on syntax axioms:   → wi 4   = wceq 1402   ∈ wcel 2209  {csn 3709  ⟨cop 3712   class class class wbr 4131   ↾ cres 4778   “ cima 4779  Fun wfun 5374  ‘cfv 5380  (class class class)co 6088  0cc0 8185  ...cfz 10428  ..^cfzo 10566  ♯chash 11236  Vtxcvtx 16458  iEdgciedg 16459  Trailsctrls 16826
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-io 721  ax-5 1500  ax-7 1501  ax-gen 1502  ax-ie1 1546  ax-ie2 1547  ax-8 1557  ax-10 1558  ax-11 1559  ax-i12 1560  ax-bndl 1562  ax-4 1563  ax-17 1579  ax-i9 1583  ax-ial 1587  ax-i5r 1588  ax-ext 2220
This proof depends on definitions:  df-bi 117  df-tru 1405  df-nf 1514  df-sb 1816  df-clab 2225  df-cleq 2231  df-clel 2234  df-nfc 2381  df-v 2823  df-in 3226  df-ss 3233  df-br 4132  df-opab 4194  df-rel 4783  df-cnv 4784  df-co 4785  df-res 4788  df-fun 5382
This theorem is used by:  trlsegvdegfi  16913
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