Theorem eupthp1 27076

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.)

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 ∈ V)
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 ∈ V)
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 27072	. . . 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 26578	. 2 ⊢ (𝜑 → 𝐻(Walks‘𝑆)𝑄)
22	2	eupthi 27063	. . . . 5 ⊢ (𝐹(EulerPaths‘𝐺)𝑃 → (𝐹(Walks‘𝐺)𝑃 ∧ 𝐹:(0..^(#‘𝐹))–1-1-onto→dom 𝐼))
23	11	eqcomi 2631	. . . . . . . . 9 ⊢ (#‘𝐹) = 𝑁
24	23	oveq2i 6661	. . . . . . . 8 ⊢ (0..^(#‘𝐹)) = (0..^𝑁)
25		f1oeq2 6128	. . . . . . . 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 206	. . . . . 6 ⊢ (𝐹:(0..^(#‘𝐹))–1-1-onto→dom 𝐼 → 𝐹:(0..^𝑁)–1-1-onto→dom 𝐼)
28	27	adantl 482	. . . . 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		fvex 6201	. . . . . . 7 ⊢ (#‘𝐹) ∈ V
31	11, 30	eqeltri 2697	. . . . . 6 ⊢ 𝑁 ∈ V
32		f1osng 6177	. . . . . 6 ⊢ ((𝑁 ∈ V ∧ 𝐵 ∈ V) → {⟨𝑁, 𝐵⟩}:{𝑁}–1-1-onto→{𝐵})
33	31, 5, 32	sylancr 695	. . . . 5 ⊢ (𝜑 → {⟨𝑁, 𝐵⟩}:{𝑁}–1-1-onto→{𝐵})
34		dmsnopg 5606	. . . . . . 7 ⊢ (𝐸 ∈ (Edg‘𝐺) → dom {⟨𝐵, 𝐸⟩} = {𝐵})
35	12, 34	syl 17	. . . . . 6 ⊢ (𝜑 → dom {⟨𝐵, 𝐸⟩} = {𝐵})
36	35	f1oeq3d 6134	. . . . 5 ⊢ (𝜑 → ({⟨𝑁, 𝐵⟩}:{𝑁}–1-1-onto→dom {⟨𝐵, 𝐸⟩} ↔ {⟨𝑁, 𝐵⟩}:{𝑁}–1-1-onto→{𝐵}))
37	33, 36	mpbird 247	. . . 4 ⊢ (𝜑 → {⟨𝑁, 𝐵⟩}:{𝑁}–1-1-onto→dom {⟨𝐵, 𝐸⟩})
38		fzodisjsn 12505	. . . . 5 ⊢ ((0..^𝑁) ∩ {𝑁}) = ∅
39	38	a1i 11	. . . 4 ⊢ (𝜑 → ((0..^𝑁) ∩ {𝑁}) = ∅)
40	35	ineq2d 3814	. . . . 5 ⊢ (𝜑 → (dom 𝐼 ∩ dom {⟨𝐵, 𝐸⟩}) = (dom 𝐼 ∩ {𝐵}))
41		disjsn 4246	. . . . . 6 ⊢ ((dom 𝐼 ∩ {𝐵}) = ∅ ↔ ¬ 𝐵 ∈ dom 𝐼)
42	7, 41	sylibr 224	. . . . 5 ⊢ (𝜑 → (dom 𝐼 ∩ {𝐵}) = ∅)
43	40, 42	eqtrd 2656	. . . 4 ⊢ (𝜑 → (dom 𝐼 ∩ dom {⟨𝐵, 𝐸⟩}) = ∅)
44		f1oun 6156	. . . 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⟩}))
45	29, 37, 39, 43, 44	syl22anc 1327	. . 3 ⊢ (𝜑 → (𝐹 ∪ {⟨𝑁, 𝐵⟩}):((0..^𝑁) ∪ {𝑁})–1-1-onto→(dom 𝐼 ∪ dom {⟨𝐵, 𝐸⟩}))
46	16	a1i 11	. . . 4 ⊢ (𝜑 → 𝐻 = (𝐹 ∪ {⟨𝑁, 𝐵⟩}))
47	1, 2, 3, 4, 5, 6, 7, 10, 11, 12, 13, 15, 16	wlkp1lem2 26571	. . . . . 6 ⊢ (𝜑 → (#‘𝐻) = (𝑁 + 1))
48	47	oveq2d 6666	. . . . 5 ⊢ (𝜑 → (0..^(#‘𝐻)) = (0..^(𝑁 + 1)))
49		wlkcl 26511	. . . . . . . 8 ⊢ (𝐹(Walks‘𝐺)𝑃 → (#‘𝐹) ∈ ℕ0)
50	11	eleq1i 2692	. . . . . . . . 9 ⊢ (𝑁 ∈ ℕ0 ↔ (#‘𝐹) ∈ ℕ0)
51		elnn0uz 11725	. . . . . . . . 9 ⊢ (𝑁 ∈ ℕ0 ↔ 𝑁 ∈ (ℤ≥‘0))
52	50, 51	sylbb1 227	. . . . . . . 8 ⊢ ((#‘𝐹) ∈ ℕ0 → 𝑁 ∈ (ℤ≥‘0))
53	49, 52	syl 17	. . . . . . 7 ⊢ (𝐹(Walks‘𝐺)𝑃 → 𝑁 ∈ (ℤ≥‘0))
54	8, 9, 53	3syl 18	. . . . . 6 ⊢ (𝜑 → 𝑁 ∈ (ℤ≥‘0))
55		fzosplitsn 12576	. . . . . 6 ⊢ (𝑁 ∈ (ℤ≥‘0) → (0..^(𝑁 + 1)) = ((0..^𝑁) ∪ {𝑁}))
56	54, 55	syl 17	. . . . 5 ⊢ (𝜑 → (0..^(𝑁 + 1)) = ((0..^𝑁) ∪ {𝑁}))
57	48, 56	eqtrd 2656	. . . 4 ⊢ (𝜑 → (0..^(#‘𝐻)) = ((0..^𝑁) ∪ {𝑁}))
58		dmun 5331	. . . . 5 ⊢ dom (𝐼 ∪ {⟨𝐵, 𝐸⟩}) = (dom 𝐼 ∪ dom {⟨𝐵, 𝐸⟩})
59	58	a1i 11	. . . 4 ⊢ (𝜑 → dom (𝐼 ∪ {⟨𝐵, 𝐸⟩}) = (dom 𝐼 ∪ dom {⟨𝐵, 𝐸⟩}))
60	46, 57, 59	f1oeq123d 6133	. . 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⟩})))
61	45, 60	mpbird 247	. 2 ⊢ (𝜑 → 𝐻:(0..^(#‘𝐻))–1-1-onto→dom (𝐼 ∪ {⟨𝐵, 𝐸⟩}))
62	14	eqcomi 2631	. . 3 ⊢ (𝐼 ∪ {⟨𝐵, 𝐸⟩}) = (iEdg‘𝑆)
63	62	iseupthf1o 27062	. 2 ⊢ (𝐻(EulerPaths‘𝑆)𝑄 ↔ (𝐻(Walks‘𝑆)𝑄 ∧ 𝐻:(0..^(#‘𝐻))–1-1-onto→dom (𝐼 ∪ {⟨𝐵, 𝐸⟩})))
64	21, 61, 63	sylanbrc 698	1 ⊢ (𝜑 → 𝐻(EulerPaths‘𝑆)𝑄)

Syntax hints:  ¬ wn 3   → wi 4   ↔ wb 196   ∧ wa 384   = wceq 1483   ∈ wcel 1990  Vcvv 3200   ∪ cun 3572   ∩ cin 3573   ⊆ wss 3574  ∅c0 3915  {csn 4177  {cpr 4179  ⟨cop 4183   class class class wbr 4653  dom cdm 5114  Fun wfun 5882  –1-1-onto→wf1o 5887  ‘cfv 5888  (class class class)co 6650  Fincfn 7955  0cc0 9936  1c1 9937   + caddc 9939  ℕ₀cn0 11292  ℤ_≥cuz 11687  ..^cfzo 12465  #chash 13117  Vtxcvtx 25874  iEdgciedg 25875  Edgcedg 25939  Walkscwlks 26492  EulerPathsceupth 27057

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1722  ax-4 1737  ax-5 1839  ax-6 1888  ax-7 1935  ax-8 1992  ax-9 1999  ax-10 2019  ax-11 2034  ax-12 2047  ax-13 2246  ax-ext 2602  ax-rep 4771  ax-sep 4781  ax-nul 4789  ax-pow 4843  ax-pr 4906  ax-un 6949  ax-cnex 9992  ax-resscn 9993  ax-1cn 9994  ax-icn 9995  ax-addcl 9996  ax-addrcl 9997  ax-mulcl 9998  ax-mulrcl 9999  ax-mulcom 10000  ax-addass 10001  ax-mulass 10002  ax-distr 10003  ax-i2m1 10004  ax-1ne0 10005  ax-1rid 10006  ax-rnegex 10007  ax-rrecex 10008  ax-cnre 10009  ax-pre-lttri 10010  ax-pre-lttrn 10011  ax-pre-ltadd 10012  ax-pre-mulgt0 10013

This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  df-ifp 1013  df-3or 1038  df-3an 1039  df-tru 1486  df-ex 1705  df-nf 1710  df-sb 1881  df-eu 2474  df-mo 2475  df-clab 2609  df-cleq 2615  df-clel 2618  df-nfc 2753  df-ne 2795  df-nel 2898  df-ral 2917  df-rex 2918  df-reu 2919  df-rmo 2920  df-rab 2921  df-v 3202  df-sbc 3436  df-csb 3534  df-dif 3577  df-un 3579  df-in 3581  df-ss 3588  df-pss 3590  df-nul 3916  df-if 4087  df-pw 4160  df-sn 4178  df-pr 4180  df-tp 4182  df-op 4184  df-uni 4437  df-int 4476  df-iun 4522  df-br 4654  df-opab 4713  df-mpt 4730  df-tr 4753  df-id 5024  df-eprel 5029  df-po 5035  df-so 5036  df-fr 5073  df-we 5075  df-xp 5120  df-rel 5121  df-cnv 5122  df-co 5123  df-dm 5124  df-rn 5125  df-res 5126  df-ima 5127  df-pred 5680  df-ord 5726  df-on 5727  df-lim 5728  df-suc 5729  df-iota 5851  df-fun 5890  df-fn 5891  df-f 5892  df-f1 5893  df-fo 5894  df-f1o 5895  df-fv 5896  df-riota 6611  df-ov 6653  df-oprab 6654  df-mpt2 6655  df-om 7066  df-1st 7168  df-2nd 7169  df-wrecs 7407  df-recs 7468  df-rdg 7506  df-1o 7560  df-oadd 7564  df-er 7742  df-map 7859  df-pm 7860  df-en 7956  df-dom 7957  df-sdom 7958  df-fin 7959  df-card 8765  df-cda 8990  df-pnf 10076  df-mnf 10077  df-xr 10078  df-ltxr 10079  df-le 10080  df-sub 10268  df-neg 10269  df-nn 11021  df-n0 11293  df-z 11378  df-uz 11688  df-fz 12327  df-fzo 12466  df-hash 13118  df-word 13299  df-wlks 26495  df-trls 26589  df-eupth 27058

This theorem is referenced by:  eupth2eucrct  27077