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Theorem eupth2lem3lem1 30316

Description: Lemma for eupth2lem3 30324. (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 2840	. . . 4 ⊢ (𝜑 → 𝑈 ∈ (Vtx‘𝑋))
4	3	elfvexd 6871	. . 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 30313	. . 3 ⊢ (𝜑 → dom (iEdg‘𝑋) ∈ Fin)
16		eqid 2737	. . . 4 ⊢ (Vtx‘𝑋) = (Vtx‘𝑋)
17		eqid 2737	. . . 4 ⊢ (iEdg‘𝑋) = (iEdg‘𝑋)
18		eqid 2737	. . . 4 ⊢ dom (iEdg‘𝑋) = dom (iEdg‘𝑋)
19	16, 17, 18	vtxdgfisf 29563	. . 3 ⊢ ((𝑋 ∈ V ∧ dom (iEdg‘𝑋) ∈ Fin) → (VtxDeg‘𝑋):(Vtx‘𝑋)⟶ℕ₀)
20	4, 15, 19	syl2anc 585	. 2 ⊢ (𝜑 → (VtxDeg‘𝑋):(Vtx‘𝑋)⟶ℕ₀)
21	20, 3	ffvelcdmd 7032	1 ⊢ (𝜑 → ((VtxDeg‘𝑋)‘𝑈) ∈ ℕ₀)

Colors of variables: wff setvar class

Syntax hints: → wi 4 = wceq 1542 ∈ wcel 2114 Vcvv 3430 {csn 4568 ⟨cop 4574 class class class wbr 5086 dom cdm 5625 ↾ cres 5627 “ cima 5628 Fun wfun 6487 ⟶wf 6489 ‘cfv 6493 (class class class)co 7361 Fincfn 8887 0cc0 11032 ℕ₀cn0 12431 ...cfz 13455 ..^cfzo 13602 ♯chash 14286 Vtxcvtx 29082 iEdgciedg 29083 VtxDegcvtxdg 29552 Trailsctrls 29775

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1912 ax-6 1969 ax-7 2010 ax-8 2116 ax-9 2124 ax-10 2147 ax-11 2163 ax-12 2185 ax-ext 2709 ax-rep 5213 ax-sep 5232 ax-nul 5242 ax-pow 5303 ax-pr 5371 ax-un 7683 ax-cnex 11088 ax-resscn 11089 ax-1cn 11090 ax-icn 11091 ax-addcl 11092 ax-addrcl 11093 ax-mulcl 11094 ax-mulrcl 11095 ax-mulcom 11096 ax-addass 11097 ax-mulass 11098 ax-distr 11099 ax-i2m1 11100 ax-1ne0 11101 ax-1rid 11102 ax-rnegex 11103 ax-rrecex 11104 ax-cnre 11105 ax-pre-lttri 11106 ax-pre-lttrn 11107 ax-pre-ltadd 11108 ax-pre-mulgt0 11109

This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-ifp 1064 df-3or 1088 df-3an 1089 df-tru 1545 df-fal 1555 df-ex 1782 df-nf 1786 df-sb 2069 df-mo 2540 df-eu 2570 df-clab 2716 df-cleq 2729 df-clel 2812 df-nfc 2886 df-ne 2934 df-nel 3038 df-ral 3053 df-rex 3063 df-reu 3344 df-rab 3391 df-v 3432 df-sbc 3730 df-csb 3839 df-dif 3893 df-un 3895 df-in 3897 df-ss 3907 df-pss 3910 df-nul 4275 df-if 4468 df-pw 4544 df-sn 4569 df-pr 4571 df-op 4575 df-uni 4852 df-int 4891 df-iun 4936 df-br 5087 df-opab 5149 df-mpt 5168 df-tr 5194 df-id 5520 df-eprel 5525 df-po 5533 df-so 5534 df-fr 5578 df-we 5580 df-xp 5631 df-rel 5632 df-cnv 5633 df-co 5634 df-dm 5635 df-rn 5636 df-res 5637 df-ima 5638 df-pred 6260 df-ord 6321 df-on 6322 df-lim 6323 df-suc 6324 df-iota 6449 df-fun 6495 df-fn 6496 df-f 6497 df-f1 6498 df-fo 6499 df-f1o 6500 df-fv 6501 df-riota 7318 df-ov 7364 df-oprab 7365 df-mpo 7366 df-om 7812 df-1st 7936 df-2nd 7937 df-frecs 8225 df-wrecs 8256 df-recs 8305 df-rdg 8343 df-1o 8399 df-er 8637 df-map 8769 df-en 8888 df-dom 8889 df-sdom 8890 df-fin 8891 df-card 9857 df-pnf 11175 df-mnf 11176 df-xr 11177 df-ltxr 11178 df-le 11179 df-sub 11373 df-neg 11374 df-nn 12169 df-n0 12432 df-xnn0 12505 df-z 12519 df-uz 12783 df-xadd 13058 df-fz 13456 df-fzo 13603 df-hash 14287 df-word 14470 df-vtxdg 29553 df-wlks 29686 df-trls 29777

This theorem is referenced by: eupth2lem3lem3 30318 eupth2lem3lem4 30319 eupth2lem3lem6 30321

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