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Theorem eupthp1 30019

Description: Append one path segment to an Eulerian path ⟨𝐹, 𝑃⟩ to become an Eulerian path ⟨𝐻, 𝑄⟩ of the supergraph 𝑆 obtained by adding the new edge to the graph 𝐺. (Contributed by Mario Carneiro, 7-Apr-2015.) (Revised by AV, 7-Mar-2021.) (Proof shortened by AV, 30-Oct-2021.) (Revised by AV, 8-Apr-2024.)

**Hypotheses**
Ref	Expression
eupthp1.v	⊢ 𝑉 = (Vtx‘𝐺)
eupthp1.i	⊢ 𝐼 = (iEdg‘𝐺)
eupthp1.f	⊢ (𝜑 → Fun 𝐼)
eupthp1.a	⊢ (𝜑 → 𝐼 ∈ Fin)
eupthp1.b	⊢ (𝜑 → 𝐵 ∈ 𝑊)
eupthp1.c	⊢ (𝜑 → 𝐶 ∈ 𝑉)
eupthp1.d	⊢ (𝜑 → ¬ 𝐵 ∈ dom 𝐼)
eupthp1.p	⊢ (𝜑 → 𝐹(EulerPaths‘𝐺)𝑃)
eupthp1.n	⊢ 𝑁 = (♯‘𝐹)
eupthp1.e	⊢ (𝜑 → 𝐸 ∈ (Edg‘𝐺))
eupthp1.x	⊢ (𝜑 → {(𝑃‘𝑁), 𝐶} ⊆ 𝐸)
eupthp1.u	⊢ (iEdg‘𝑆) = (𝐼 ∪ {⟨𝐵, 𝐸⟩})
eupthp1.h	⊢ 𝐻 = (𝐹 ∪ {⟨𝑁, 𝐵⟩})
eupthp1.q	⊢ 𝑄 = (𝑃 ∪ {⟨(𝑁 + 1), 𝐶⟩})
eupthp1.s	⊢ (Vtx‘𝑆) = 𝑉
eupthp1.l	⊢ ((𝜑 ∧ 𝐶 = (𝑃‘𝑁)) → 𝐸 = {𝐶})

**Assertion**
Ref	Expression
eupthp1	⊢ (𝜑 → 𝐻(EulerPaths‘𝑆)𝑄)

**Proof of Theorem eupthp1**
Step	Hyp	Ref	Expression
1		eupthp1.v	. . 3 ⊢ 𝑉 = (Vtx‘𝐺)
2		eupthp1.i	. . 3 ⊢ 𝐼 = (iEdg‘𝐺)
3		eupthp1.f	. . 3 ⊢ (𝜑 → Fun 𝐼)
4		eupthp1.a	. . 3 ⊢ (𝜑 → 𝐼 ∈ Fin)
5		eupthp1.b	. . 3 ⊢ (𝜑 → 𝐵 ∈ 𝑊)
6		eupthp1.c	. . 3 ⊢ (𝜑 → 𝐶 ∈ 𝑉)
7		eupthp1.d	. . 3 ⊢ (𝜑 → ¬ 𝐵 ∈ dom 𝐼)
8		eupthp1.p	. . . 4 ⊢ (𝜑 → 𝐹(EulerPaths‘𝐺)𝑃)
9		eupthiswlk 30015	. . . 4 ⊢ (𝐹(EulerPaths‘𝐺)𝑃 → 𝐹(Walks‘𝐺)𝑃)
10	8, 9	syl 17	. . 3 ⊢ (𝜑 → 𝐹(Walks‘𝐺)𝑃)
11		eupthp1.n	. . 3 ⊢ 𝑁 = (♯‘𝐹)
12		eupthp1.e	. . 3 ⊢ (𝜑 → 𝐸 ∈ (Edg‘𝐺))
13		eupthp1.x	. . 3 ⊢ (𝜑 → {(𝑃‘𝑁), 𝐶} ⊆ 𝐸)
14		eupthp1.u	. . . 4 ⊢ (iEdg‘𝑆) = (𝐼 ∪ {⟨𝐵, 𝐸⟩})
15	14	a1i 11	. . 3 ⊢ (𝜑 → (iEdg‘𝑆) = (𝐼 ∪ {⟨𝐵, 𝐸⟩}))
16		eupthp1.h	. . 3 ⊢ 𝐻 = (𝐹 ∪ {⟨𝑁, 𝐵⟩})
17		eupthp1.q	. . 3 ⊢ 𝑄 = (𝑃 ∪ {⟨(𝑁 + 1), 𝐶⟩})
18		eupthp1.s	. . . 4 ⊢ (Vtx‘𝑆) = 𝑉
19	18	a1i 11	. . 3 ⊢ (𝜑 → (Vtx‘𝑆) = 𝑉)
20		eupthp1.l	. . 3 ⊢ ((𝜑 ∧ 𝐶 = (𝑃‘𝑁)) → 𝐸 = {𝐶})
21	1, 2, 3, 4, 5, 6, 7, 10, 11, 12, 13, 15, 16, 17, 19, 20	wlkp1 29488	. 2 ⊢ (𝜑 → 𝐻(Walks‘𝑆)𝑄)
22	2	eupthi 30006	. . . . 5 ⊢ (𝐹(EulerPaths‘𝐺)𝑃 → (𝐹(Walks‘𝐺)𝑃 ∧ 𝐹:(0..^(♯‘𝐹))–1-1-onto→dom 𝐼))
23	11	eqcomi 2737	. . . . . . . . 9 ⊢ (♯‘𝐹) = 𝑁
24	23	oveq2i 7425	. . . . . . . 8 ⊢ (0..^(♯‘𝐹)) = (0..^𝑁)
25		f1oeq2 6822	. . . . . . . 8 ⊢ ((0..^(♯‘𝐹)) = (0..^𝑁) → (𝐹:(0..^(♯‘𝐹))–1-1-onto→dom 𝐼 ↔ 𝐹:(0..^𝑁)–1-1-onto→dom 𝐼))
26	24, 25	ax-mp 5	. . . . . . 7 ⊢ (𝐹:(0..^(♯‘𝐹))–1-1-onto→dom 𝐼 ↔ 𝐹:(0..^𝑁)–1-1-onto→dom 𝐼)
27	26	biimpi 215	. . . . . 6 ⊢ (𝐹:(0..^(♯‘𝐹))–1-1-onto→dom 𝐼 → 𝐹:(0..^𝑁)–1-1-onto→dom 𝐼)
28	27	adantl 481	. . . . 5 ⊢ ((𝐹(Walks‘𝐺)𝑃 ∧ 𝐹:(0..^(♯‘𝐹))–1-1-onto→dom 𝐼) → 𝐹:(0..^𝑁)–1-1-onto→dom 𝐼)
29	8, 22, 28	3syl 18	. . . 4 ⊢ (𝜑 → 𝐹:(0..^𝑁)–1-1-onto→dom 𝐼)
30	11	fvexi 6905	. . . . . 6 ⊢ 𝑁 ∈ V
31		f1osng 6874	. . . . . 6 ⊢ ((𝑁 ∈ V ∧ 𝐵 ∈ 𝑊) → {⟨𝑁, 𝐵⟩}:{𝑁}–1-1-onto→{𝐵})
32	30, 5, 31	sylancr 586	. . . . 5 ⊢ (𝜑 → {⟨𝑁, 𝐵⟩}:{𝑁}–1-1-onto→{𝐵})
33		dmsnopg 6211	. . . . . . 7 ⊢ (𝐸 ∈ (Edg‘𝐺) → dom {⟨𝐵, 𝐸⟩} = {𝐵})
34	12, 33	syl 17	. . . . . 6 ⊢ (𝜑 → dom {⟨𝐵, 𝐸⟩} = {𝐵})
35	34	f1oeq3d 6830	. . . . 5 ⊢ (𝜑 → ({⟨𝑁, 𝐵⟩}:{𝑁}–1-1-onto→dom {⟨𝐵, 𝐸⟩} ↔ {⟨𝑁, 𝐵⟩}:{𝑁}–1-1-onto→{𝐵}))
36	32, 35	mpbird 257	. . . 4 ⊢ (𝜑 → {⟨𝑁, 𝐵⟩}:{𝑁}–1-1-onto→dom {⟨𝐵, 𝐸⟩})
37		fzodisjsn 13696	. . . . 5 ⊢ ((0..^𝑁) ∩ {𝑁}) = ∅
38	37	a1i 11	. . . 4 ⊢ (𝜑 → ((0..^𝑁) ∩ {𝑁}) = ∅)
39	34	ineq2d 4208	. . . . 5 ⊢ (𝜑 → (dom 𝐼 ∩ dom {⟨𝐵, 𝐸⟩}) = (dom 𝐼 ∩ {𝐵}))
40		disjsn 4711	. . . . . 6 ⊢ ((dom 𝐼 ∩ {𝐵}) = ∅ ↔ ¬ 𝐵 ∈ dom 𝐼)
41	7, 40	sylibr 233	. . . . 5 ⊢ (𝜑 → (dom 𝐼 ∩ {𝐵}) = ∅)
42	39, 41	eqtrd 2768	. . . 4 ⊢ (𝜑 → (dom 𝐼 ∩ dom {⟨𝐵, 𝐸⟩}) = ∅)
43		f1oun 6852	. . . 4 ⊢ (((𝐹:(0..^𝑁)–1-1-onto→dom 𝐼 ∧ {⟨𝑁, 𝐵⟩}:{𝑁}–1-1-onto→dom {⟨𝐵, 𝐸⟩}) ∧ (((0..^𝑁) ∩ {𝑁}) = ∅ ∧ (dom 𝐼 ∩ dom {⟨𝐵, 𝐸⟩}) = ∅)) → (𝐹 ∪ {⟨𝑁, 𝐵⟩}):((0..^𝑁) ∪ {𝑁})–1-1-onto→(dom 𝐼 ∪ dom {⟨𝐵, 𝐸⟩}))
44	29, 36, 38, 42, 43	syl22anc 838	. . 3 ⊢ (𝜑 → (𝐹 ∪ {⟨𝑁, 𝐵⟩}):((0..^𝑁) ∪ {𝑁})–1-1-onto→(dom 𝐼 ∪ dom {⟨𝐵, 𝐸⟩}))
45	16	a1i 11	. . . 4 ⊢ (𝜑 → 𝐻 = (𝐹 ∪ {⟨𝑁, 𝐵⟩}))
46	1, 2, 3, 4, 5, 6, 7, 10, 11, 12, 13, 15, 16	wlkp1lem2 29481	. . . . . 6 ⊢ (𝜑 → (♯‘𝐻) = (𝑁 + 1))
47	46	oveq2d 7430	. . . . 5 ⊢ (𝜑 → (0..^(♯‘𝐻)) = (0..^(𝑁 + 1)))
48		wlkcl 29422	. . . . . . . 8 ⊢ (𝐹(Walks‘𝐺)𝑃 → (♯‘𝐹) ∈ ℕ₀)
49	11	eleq1i 2820	. . . . . . . . 9 ⊢ (𝑁 ∈ ℕ₀ ↔ (♯‘𝐹) ∈ ℕ₀)
50		elnn0uz 12891	. . . . . . . . 9 ⊢ (𝑁 ∈ ℕ₀ ↔ 𝑁 ∈ (ℤ_≥‘0))
51	49, 50	sylbb1 236	. . . . . . . 8 ⊢ ((♯‘𝐹) ∈ ℕ₀ → 𝑁 ∈ (ℤ_≥‘0))
52	48, 51	syl 17	. . . . . . 7 ⊢ (𝐹(Walks‘𝐺)𝑃 → 𝑁 ∈ (ℤ_≥‘0))
53	8, 9, 52	3syl 18	. . . . . 6 ⊢ (𝜑 → 𝑁 ∈ (ℤ_≥‘0))
54		fzosplitsn 13766	. . . . . 6 ⊢ (𝑁 ∈ (ℤ_≥‘0) → (0..^(𝑁 + 1)) = ((0..^𝑁) ∪ {𝑁}))
55	53, 54	syl 17	. . . . 5 ⊢ (𝜑 → (0..^(𝑁 + 1)) = ((0..^𝑁) ∪ {𝑁}))
56	47, 55	eqtrd 2768	. . . 4 ⊢ (𝜑 → (0..^(♯‘𝐻)) = ((0..^𝑁) ∪ {𝑁}))
57		dmun 5907	. . . . 5 ⊢ dom (𝐼 ∪ {⟨𝐵, 𝐸⟩}) = (dom 𝐼 ∪ dom {⟨𝐵, 𝐸⟩})
58	57	a1i 11	. . . 4 ⊢ (𝜑 → dom (𝐼 ∪ {⟨𝐵, 𝐸⟩}) = (dom 𝐼 ∪ dom {⟨𝐵, 𝐸⟩}))
59	45, 56, 58	f1oeq123d 6827	. . 3 ⊢ (𝜑 → (𝐻:(0..^(♯‘𝐻))–1-1-onto→dom (𝐼 ∪ {⟨𝐵, 𝐸⟩}) ↔ (𝐹 ∪ {⟨𝑁, 𝐵⟩}):((0..^𝑁) ∪ {𝑁})–1-1-onto→(dom 𝐼 ∪ dom {⟨𝐵, 𝐸⟩})))
60	44, 59	mpbird 257	. 2 ⊢ (𝜑 → 𝐻:(0..^(♯‘𝐻))–1-1-onto→dom (𝐼 ∪ {⟨𝐵, 𝐸⟩}))
61	14	eqcomi 2737	. . 3 ⊢ (𝐼 ∪ {⟨𝐵, 𝐸⟩}) = (iEdg‘𝑆)
62	61	iseupthf1o 30005	. 2 ⊢ (𝐻(EulerPaths‘𝑆)𝑄 ↔ (𝐻(Walks‘𝑆)𝑄 ∧ 𝐻:(0..^(♯‘𝐻))–1-1-onto→dom (𝐼 ∪ {⟨𝐵, 𝐸⟩})))
63	21, 60, 62	sylanbrc 582	1 ⊢ (𝜑 → 𝐻(EulerPaths‘𝑆)𝑄)

Colors of variables: wff setvar class

Syntax hints: ¬ wn 3 → wi 4 ↔ wb 205 ∧ wa 395 = wceq 1534 ∈ wcel 2099 Vcvv 3470 ∪ cun 3943 ∩ cin 3944 ⊆ wss 3945 ∅c0 4318 {csn 4624 {cpr 4626 ⟨cop 4630 class class class wbr 5142 dom cdm 5672 Fun wfun 6536 –1-1-onto→wf1o 6541 ‘cfv 6542 (class class class)co 7414 Fincfn 8957 0cc0 11132 1c1 11133 + caddc 11135 ℕ₀cn0 12496 ℤ_≥cuz 12846 ..^cfzo 13653 ♯chash 14315 Vtxcvtx 28802 iEdgciedg 28803 Edgcedg 28853 Walkscwlks 29403 EulerPathsceupth 30000

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1790 ax-4 1804 ax-5 1906 ax-6 1964 ax-7 2004 ax-8 2101 ax-9 2109 ax-10 2130 ax-11 2147 ax-12 2167 ax-ext 2699 ax-rep 5279 ax-sep 5293 ax-nul 5300 ax-pow 5359 ax-pr 5423 ax-un 7734 ax-cnex 11188 ax-resscn 11189 ax-1cn 11190 ax-icn 11191 ax-addcl 11192 ax-addrcl 11193 ax-mulcl 11194 ax-mulrcl 11195 ax-mulcom 11196 ax-addass 11197 ax-mulass 11198 ax-distr 11199 ax-i2m1 11200 ax-1ne0 11201 ax-1rid 11202 ax-rnegex 11203 ax-rrecex 11204 ax-cnre 11205 ax-pre-lttri 11206 ax-pre-lttrn 11207 ax-pre-ltadd 11208 ax-pre-mulgt0 11209

This theorem depends on definitions: df-bi 206 df-an 396 df-or 847 df-ifp 1062 df-3or 1086 df-3an 1087 df-tru 1537 df-fal 1547 df-ex 1775 df-nf 1779 df-sb 2061 df-mo 2530 df-eu 2559 df-clab 2706 df-cleq 2720 df-clel 2806 df-nfc 2881 df-ne 2937 df-nel 3043 df-ral 3058 df-rex 3067 df-reu 3373 df-rab 3429 df-v 3472 df-sbc 3776 df-csb 3891 df-dif 3948 df-un 3950 df-in 3952 df-ss 3962 df-pss 3964 df-nul 4319 df-if 4525 df-pw 4600 df-sn 4625 df-pr 4627 df-op 4631 df-uni 4904 df-int 4945 df-iun 4993 df-br 5143 df-opab 5205 df-mpt 5226 df-tr 5260 df-id 5570 df-eprel 5576 df-po 5584 df-so 5585 df-fr 5627 df-we 5629 df-xp 5678 df-rel 5679 df-cnv 5680 df-co 5681 df-dm 5682 df-rn 5683 df-res 5684 df-ima 5685 df-pred 6299 df-ord 6366 df-on 6367 df-lim 6368 df-suc 6369 df-iota 6494 df-fun 6544 df-fn 6545 df-f 6546 df-f1 6547 df-fo 6548 df-f1o 6549 df-fv 6550 df-riota 7370 df-ov 7417 df-oprab 7418 df-mpo 7419 df-om 7865 df-1st 7987 df-2nd 7988 df-frecs 8280 df-wrecs 8311 df-recs 8385 df-rdg 8424 df-1o 8480 df-oadd 8484 df-er 8718 df-map 8840 df-pm 8841 df-en 8958 df-dom 8959 df-sdom 8960 df-fin 8961 df-dju 9918 df-card 9956 df-pnf 11274 df-mnf 11275 df-xr 11276 df-ltxr 11277 df-le 11278 df-sub 11470 df-neg 11471 df-nn 12237 df-n0 12497 df-z 12583 df-uz 12847 df-fz 13511 df-fzo 13654 df-hash 14316 df-word 14491 df-wlks 29406 df-trls 29499 df-eupth 30001

This theorem is referenced by: eupth2eucrct 30020

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