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Theorem eupth2lem3lem1 28493

Description: Lemma for eupth2lem3 28501. (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
eupth2lem3lem1	⊢ (𝜑 → ((VtxDeg‘𝑋)‘𝑈) ∈ ℕ₀)

**Proof of Theorem eupth2lem3lem1**
Step	Hyp	Ref	Expression
1		trlsegvdeg.u	. . . . 5 ⊢ (𝜑 → 𝑈 ∈ 𝑉)
2		trlsegvdeg.vx	. . . . 5 ⊢ (𝜑 → (Vtx‘𝑋) = 𝑉)
3	1, 2	eleqtrrd 2842	. . . 4 ⊢ (𝜑 → 𝑈 ∈ (Vtx‘𝑋))
4	3	elfvexd 6790	. . 3 ⊢ (𝜑 → 𝑋 ∈ V)
5		trlsegvdeg.v	. . . 4 ⊢ 𝑉 = (Vtx‘𝐺)
6		trlsegvdeg.i	. . . 4 ⊢ 𝐼 = (iEdg‘𝐺)
7		trlsegvdeg.f	. . . 4 ⊢ (𝜑 → Fun 𝐼)
8		trlsegvdeg.n	. . . 4 ⊢ (𝜑 → 𝑁 ∈ (0..^(♯‘𝐹)))
9		trlsegvdeg.w	. . . 4 ⊢ (𝜑 → 𝐹(Trails‘𝐺)𝑃)
10		trlsegvdeg.vy	. . . 4 ⊢ (𝜑 → (Vtx‘𝑌) = 𝑉)
11		trlsegvdeg.vz	. . . 4 ⊢ (𝜑 → (Vtx‘𝑍) = 𝑉)
12		trlsegvdeg.ix	. . . 4 ⊢ (𝜑 → (iEdg‘𝑋) = (𝐼 ↾ (𝐹 “ (0..^𝑁))))
13		trlsegvdeg.iy	. . . 4 ⊢ (𝜑 → (iEdg‘𝑌) = {⟨(𝐹‘𝑁), (𝐼‘(𝐹‘𝑁))⟩})
14		trlsegvdeg.iz	. . . 4 ⊢ (𝜑 → (iEdg‘𝑍) = (𝐼 ↾ (𝐹 “ (0...𝑁))))
15	5, 6, 7, 8, 1, 9, 2, 10, 11, 12, 13, 14	trlsegvdeglem6 28490	. . 3 ⊢ (𝜑 → dom (iEdg‘𝑋) ∈ Fin)
16		eqid 2738	. . . 4 ⊢ (Vtx‘𝑋) = (Vtx‘𝑋)
17		eqid 2738	. . . 4 ⊢ (iEdg‘𝑋) = (iEdg‘𝑋)
18		eqid 2738	. . . 4 ⊢ dom (iEdg‘𝑋) = dom (iEdg‘𝑋)
19	16, 17, 18	vtxdgfisf 27746	. . 3 ⊢ ((𝑋 ∈ V ∧ dom (iEdg‘𝑋) ∈ Fin) → (VtxDeg‘𝑋):(Vtx‘𝑋)⟶ℕ₀)
20	4, 15, 19	syl2anc 583	. 2 ⊢ (𝜑 → (VtxDeg‘𝑋):(Vtx‘𝑋)⟶ℕ₀)
21	20, 3	ffvelrnd 6944	1 ⊢ (𝜑 → ((VtxDeg‘𝑋)‘𝑈) ∈ ℕ₀)

Colors of variables: wff setvar class

Syntax hints: → wi 4 = wceq 1539 ∈ wcel 2108 Vcvv 3422 {csn 4558 ⟨cop 4564 class class class wbr 5070 dom cdm 5580 ↾ cres 5582 “ cima 5583 Fun wfun 6412 ⟶wf 6414 ‘cfv 6418 (class class class)co 7255 Fincfn 8691 0cc0 10802 ℕ₀cn0 12163 ...cfz 13168 ..^cfzo 13311 ♯chash 13972 Vtxcvtx 27269 iEdgciedg 27270 VtxDegcvtxdg 27735 Trailsctrls 27960

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1799 ax-4 1813 ax-5 1914 ax-6 1972 ax-7 2012 ax-8 2110 ax-9 2118 ax-10 2139 ax-11 2156 ax-12 2173 ax-ext 2709 ax-rep 5205 ax-sep 5218 ax-nul 5225 ax-pow 5283 ax-pr 5347 ax-un 7566 ax-cnex 10858 ax-resscn 10859 ax-1cn 10860 ax-icn 10861 ax-addcl 10862 ax-addrcl 10863 ax-mulcl 10864 ax-mulrcl 10865 ax-mulcom 10866 ax-addass 10867 ax-mulass 10868 ax-distr 10869 ax-i2m1 10870 ax-1ne0 10871 ax-1rid 10872 ax-rnegex 10873 ax-rrecex 10874 ax-cnre 10875 ax-pre-lttri 10876 ax-pre-lttrn 10877 ax-pre-ltadd 10878 ax-pre-mulgt0 10879

This theorem depends on definitions: df-bi 206 df-an 396 df-or 844 df-ifp 1060 df-3or 1086 df-3an 1087 df-tru 1542 df-fal 1552 df-ex 1784 df-nf 1788 df-sb 2069 df-mo 2540 df-eu 2569 df-clab 2716 df-cleq 2730 df-clel 2817 df-nfc 2888 df-ne 2943 df-nel 3049 df-ral 3068 df-rex 3069 df-reu 3070 df-rab 3072 df-v 3424 df-sbc 3712 df-csb 3829 df-dif 3886 df-un 3888 df-in 3890 df-ss 3900 df-pss 3902 df-nul 4254 df-if 4457 df-pw 4532 df-sn 4559 df-pr 4561 df-tp 4563 df-op 4565 df-uni 4837 df-int 4877 df-iun 4923 df-br 5071 df-opab 5133 df-mpt 5154 df-tr 5188 df-id 5480 df-eprel 5486 df-po 5494 df-so 5495 df-fr 5535 df-we 5537 df-xp 5586 df-rel 5587 df-cnv 5588 df-co 5589 df-dm 5590 df-rn 5591 df-res 5592 df-ima 5593 df-pred 6191 df-ord 6254 df-on 6255 df-lim 6256 df-suc 6257 df-iota 6376 df-fun 6420 df-fn 6421 df-f 6422 df-f1 6423 df-fo 6424 df-f1o 6425 df-fv 6426 df-riota 7212 df-ov 7258 df-oprab 7259 df-mpo 7260 df-om 7688 df-1st 7804 df-2nd 7805 df-frecs 8068 df-wrecs 8099 df-recs 8173 df-rdg 8212 df-1o 8267 df-er 8456 df-map 8575 df-en 8692 df-dom 8693 df-sdom 8694 df-fin 8695 df-card 9628 df-pnf 10942 df-mnf 10943 df-xr 10944 df-ltxr 10945 df-le 10946 df-sub 11137 df-neg 11138 df-nn 11904 df-n0 12164 df-xnn0 12236 df-z 12250 df-uz 12512 df-xadd 12778 df-fz 13169 df-fzo 13312 df-hash 13973 df-word 14146 df-vtxdg 27736 df-wlks 27869 df-trls 27962

This theorem is referenced by: eupth2lem3lem3 28495 eupth2lem3lem4 28496 eupth2lem3lem6 28498

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