Theorem trlsegvdeglem5 28003

Description: Lemma for trlsegvdeg 28006. (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	⊢ (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
trlsegvdeglem5	⊢ (𝜑 → dom (iEdg‘𝑌) = {(𝐹‘𝑁)})

Proof of Theorem trlsegvdeglem5

Step	Hyp	Ref	Expression
1		trlsegvdeg.iy	. . 3 ⊢ (𝜑 → (iEdg‘𝑌) = {⟨(𝐹‘𝑁), (𝐼‘(𝐹‘𝑁))⟩})
2	1	dmeqd 5774	. 2 ⊢ (𝜑 → dom (iEdg‘𝑌) = dom {⟨(𝐹‘𝑁), (𝐼‘(𝐹‘𝑁))⟩})
3		fvex 6683	. . 3 ⊢ (𝐼‘(𝐹‘𝑁)) ∈ V
4		dmsnopg 6070	. . 3 ⊢ ((𝐼‘(𝐹‘𝑁)) ∈ V → dom {⟨(𝐹‘𝑁), (𝐼‘(𝐹‘𝑁))⟩} = {(𝐹‘𝑁)})
5	3, 4	mp1i 13	. 2 ⊢ (𝜑 → dom {⟨(𝐹‘𝑁), (𝐼‘(𝐹‘𝑁))⟩} = {(𝐹‘𝑁)})
6	2, 5	eqtrd 2856	1 ⊢ (𝜑 → dom (iEdg‘𝑌) = {(𝐹‘𝑁)})

Syntax hints:   → wi 4   = wceq 1537   ∈ wcel 2114  Vcvv 3494  {csn 4567  ⟨cop 4573   class class class wbr 5066  dom cdm 5555   ↾ cres 5557   “ cima 5558  Fun wfun 6349  ‘cfv 6355  (class class class)co 7156  0cc0 10537  ...cfz 12893  ..^cfzo 13034  ♯chash 13691  Vtxcvtx 26781  iEdgciedg 26782  Trailsctrls 27472

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1796  ax-4 1810  ax-5 1911  ax-6 1970  ax-7 2015  ax-8 2116  ax-9 2124  ax-10 2145  ax-11 2161  ax-12 2177  ax-ext 2793  ax-sep 5203  ax-nul 5210  ax-pr 5330

This theorem depends on definitions:  df-bi 209  df-an 399  df-or 844  df-3an 1085  df-tru 1540  df-ex 1781  df-nf 1785  df-sb 2070  df-mo 2622  df-eu 2654  df-clab 2800  df-cleq 2814  df-clel 2893  df-nfc 2963  df-ral 3143  df-rex 3144  df-rab 3147  df-v 3496  df-sbc 3773  df-dif 3939  df-un 3941  df-in 3943  df-ss 3952  df-nul 4292  df-if 4468  df-sn 4568  df-pr 4570  df-op 4574  df-uni 4839  df-br 5067  df-dm 5565  df-iota 6314  df-fv 6363

This theorem is referenced by:  trlsegvdeglem7  28005  trlsegvdeg  28006