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Theorem eupth2lem3lem1 30247

Description: Lemma for eupth2lem3 30255. (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 2844	. . . 4 ⊢ (𝜑 → 𝑈 ∈ (Vtx‘𝑋))
4	3	elfvexd 6945	. . 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 30244	. . 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 29494	. . 3 ⊢ ((𝑋 ∈ V ∧ dom (iEdg‘𝑋) ∈ Fin) → (VtxDeg‘𝑋):(Vtx‘𝑋)⟶ℕ₀)
20	4, 15, 19	syl2anc 584	. 2 ⊢ (𝜑 → (VtxDeg‘𝑋):(Vtx‘𝑋)⟶ℕ₀)
21	20, 3	ffvelcdmd 7105	1 ⊢ (𝜑 → ((VtxDeg‘𝑋)‘𝑈) ∈ ℕ₀)

Colors of variables: wff setvar class

Syntax hints: → wi 4 = wceq 1540 ∈ wcel 2108 Vcvv 3480 {csn 4626 ⟨cop 4632 class class class wbr 5143 dom cdm 5685 ↾ cres 5687 “ cima 5688 Fun wfun 6555 ⟶wf 6557 ‘cfv 6561 (class class class)co 7431 Fincfn 8985 0cc0 11155 ℕ₀cn0 12526 ...cfz 13547 ..^cfzo 13694 ♯chash 14369 Vtxcvtx 29013 iEdgciedg 29014 VtxDegcvtxdg 29483 Trailsctrls 29708

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1795 ax-4 1809 ax-5 1910 ax-6 1967 ax-7 2007 ax-8 2110 ax-9 2118 ax-10 2141 ax-11 2157 ax-12 2177 ax-ext 2708 ax-rep 5279 ax-sep 5296 ax-nul 5306 ax-pow 5365 ax-pr 5432 ax-un 7755 ax-cnex 11211 ax-resscn 11212 ax-1cn 11213 ax-icn 11214 ax-addcl 11215 ax-addrcl 11216 ax-mulcl 11217 ax-mulrcl 11218 ax-mulcom 11219 ax-addass 11220 ax-mulass 11221 ax-distr 11222 ax-i2m1 11223 ax-1ne0 11224 ax-1rid 11225 ax-rnegex 11226 ax-rrecex 11227 ax-cnre 11228 ax-pre-lttri 11229 ax-pre-lttrn 11230 ax-pre-ltadd 11231 ax-pre-mulgt0 11232

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 1543 df-fal 1553 df-ex 1780 df-nf 1784 df-sb 2065 df-mo 2540 df-eu 2569 df-clab 2715 df-cleq 2729 df-clel 2816 df-nfc 2892 df-ne 2941 df-nel 3047 df-ral 3062 df-rex 3071 df-reu 3381 df-rab 3437 df-v 3482 df-sbc 3789 df-csb 3900 df-dif 3954 df-un 3956 df-in 3958 df-ss 3968 df-pss 3971 df-nul 4334 df-if 4526 df-pw 4602 df-sn 4627 df-pr 4629 df-op 4633 df-uni 4908 df-int 4947 df-iun 4993 df-br 5144 df-opab 5206 df-mpt 5226 df-tr 5260 df-id 5578 df-eprel 5584 df-po 5592 df-so 5593 df-fr 5637 df-we 5639 df-xp 5691 df-rel 5692 df-cnv 5693 df-co 5694 df-dm 5695 df-rn 5696 df-res 5697 df-ima 5698 df-pred 6321 df-ord 6387 df-on 6388 df-lim 6389 df-suc 6390 df-iota 6514 df-fun 6563 df-fn 6564 df-f 6565 df-f1 6566 df-fo 6567 df-f1o 6568 df-fv 6569 df-riota 7388 df-ov 7434 df-oprab 7435 df-mpo 7436 df-om 7888 df-1st 8014 df-2nd 8015 df-frecs 8306 df-wrecs 8337 df-recs 8411 df-rdg 8450 df-1o 8506 df-er 8745 df-map 8868 df-en 8986 df-dom 8987 df-sdom 8988 df-fin 8989 df-card 9979 df-pnf 11297 df-mnf 11298 df-xr 11299 df-ltxr 11300 df-le 11301 df-sub 11494 df-neg 11495 df-nn 12267 df-n0 12527 df-xnn0 12600 df-z 12614 df-uz 12879 df-xadd 13155 df-fz 13548 df-fzo 13695 df-hash 14370 df-word 14553 df-vtxdg 29484 df-wlks 29617 df-trls 29710

This theorem is referenced by: eupth2lem3lem3 30249 eupth2lem3lem4 30250 eupth2lem3lem6 30252

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