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Theorem clwlkclwwlk2 29253

Description: A closed walk corresponds to a closed walk as word in a simple pseudograph. (Contributed by Alexander van der Vekens, 22-Jun-2018.) (Revised by AV, 24-Apr-2021.) (Proof shortened by AV, 2-Nov-2022.)

**Hypotheses**
Ref	Expression
clwlkclwwlk.v	⊢ 𝑉 = (Vtx‘𝐺)
clwlkclwwlk.e	⊢ 𝐸 = (iEdg‘𝐺)

**Assertion**
Ref	Expression
clwlkclwwlk2	⊢ ((𝐺 ∈ USPGraph ∧ 𝑃 ∈ Word 𝑉 ∧ 1 ≤ (♯‘𝑃)) → (∃𝑓 𝑓(ClWalks‘𝐺)(𝑃 ++ ⟨“(𝑃‘0)”⟩) ↔ 𝑃 ∈ (ClWWalks‘𝐺)))

Distinct variable groups: 𝑓,𝐸 𝑃,𝑓 𝑓,𝑉 𝑓,𝐺

**Proof of Theorem clwlkclwwlk2**
Step	Hyp	Ref	Expression
1		simp1 1136	. . 3 ⊢ ((𝐺 ∈ USPGraph ∧ 𝑃 ∈ Word 𝑉 ∧ 1 ≤ (♯‘𝑃)) → 𝐺 ∈ USPGraph)
2		wrdsymb1 14502	. . . . . 6 ⊢ ((𝑃 ∈ Word 𝑉 ∧ 1 ≤ (♯‘𝑃)) → (𝑃‘0) ∈ 𝑉)
3	2	s1cld 14552	. . . . 5 ⊢ ((𝑃 ∈ Word 𝑉 ∧ 1 ≤ (♯‘𝑃)) → ⟨“(𝑃‘0)”⟩ ∈ Word 𝑉)
4		ccatcl 14523	. . . . 5 ⊢ ((𝑃 ∈ Word 𝑉 ∧ ⟨“(𝑃‘0)”⟩ ∈ Word 𝑉) → (𝑃 ++ ⟨“(𝑃‘0)”⟩) ∈ Word 𝑉)
5	3, 4	syldan 591	. . . 4 ⊢ ((𝑃 ∈ Word 𝑉 ∧ 1 ≤ (♯‘𝑃)) → (𝑃 ++ ⟨“(𝑃‘0)”⟩) ∈ Word 𝑉)
6	5	3adant1 1130	. . 3 ⊢ ((𝐺 ∈ USPGraph ∧ 𝑃 ∈ Word 𝑉 ∧ 1 ≤ (♯‘𝑃)) → (𝑃 ++ ⟨“(𝑃‘0)”⟩) ∈ Word 𝑉)
7		lencl 14482	. . . . . . . 8 ⊢ (𝑃 ∈ Word 𝑉 → (♯‘𝑃) ∈ ℕ₀)
8		1e2m1 12338	. . . . . . . . . 10 ⊢ 1 = (2 − 1)
9	8	breq1i 5155	. . . . . . . . 9 ⊢ (1 ≤ (♯‘𝑃) ↔ (2 − 1) ≤ (♯‘𝑃))
10		2re 12285	. . . . . . . . . . 11 ⊢ 2 ∈ ℝ
11	10	a1i 11	. . . . . . . . . 10 ⊢ ((♯‘𝑃) ∈ ℕ₀ → 2 ∈ ℝ)
12		1red 11214	. . . . . . . . . 10 ⊢ ((♯‘𝑃) ∈ ℕ₀ → 1 ∈ ℝ)
13		nn0re 12480	. . . . . . . . . 10 ⊢ ((♯‘𝑃) ∈ ℕ₀ → (♯‘𝑃) ∈ ℝ)
14	11, 12, 13	lesubaddd 11810	. . . . . . . . 9 ⊢ ((♯‘𝑃) ∈ ℕ₀ → ((2 − 1) ≤ (♯‘𝑃) ↔ 2 ≤ ((♯‘𝑃) + 1)))
15	9, 14	bitrid 282	. . . . . . . 8 ⊢ ((♯‘𝑃) ∈ ℕ₀ → (1 ≤ (♯‘𝑃) ↔ 2 ≤ ((♯‘𝑃) + 1)))
16	7, 15	syl 17	. . . . . . 7 ⊢ (𝑃 ∈ Word 𝑉 → (1 ≤ (♯‘𝑃) ↔ 2 ≤ ((♯‘𝑃) + 1)))
17	16	biimpa 477	. . . . . 6 ⊢ ((𝑃 ∈ Word 𝑉 ∧ 1 ≤ (♯‘𝑃)) → 2 ≤ ((♯‘𝑃) + 1))
18		s1len 14555	. . . . . . 7 ⊢ (♯‘⟨“(𝑃‘0)”⟩) = 1
19	18	oveq2i 7419	. . . . . 6 ⊢ ((♯‘𝑃) + (♯‘⟨“(𝑃‘0)”⟩)) = ((♯‘𝑃) + 1)
20	17, 19	breqtrrdi 5190	. . . . 5 ⊢ ((𝑃 ∈ Word 𝑉 ∧ 1 ≤ (♯‘𝑃)) → 2 ≤ ((♯‘𝑃) + (♯‘⟨“(𝑃‘0)”⟩)))
21		ccatlen 14524	. . . . . 6 ⊢ ((𝑃 ∈ Word 𝑉 ∧ ⟨“(𝑃‘0)”⟩ ∈ Word 𝑉) → (♯‘(𝑃 ++ ⟨“(𝑃‘0)”⟩)) = ((♯‘𝑃) + (♯‘⟨“(𝑃‘0)”⟩)))
22	3, 21	syldan 591	. . . . 5 ⊢ ((𝑃 ∈ Word 𝑉 ∧ 1 ≤ (♯‘𝑃)) → (♯‘(𝑃 ++ ⟨“(𝑃‘0)”⟩)) = ((♯‘𝑃) + (♯‘⟨“(𝑃‘0)”⟩)))
23	20, 22	breqtrrd 5176	. . . 4 ⊢ ((𝑃 ∈ Word 𝑉 ∧ 1 ≤ (♯‘𝑃)) → 2 ≤ (♯‘(𝑃 ++ ⟨“(𝑃‘0)”⟩)))
24	23	3adant1 1130	. . 3 ⊢ ((𝐺 ∈ USPGraph ∧ 𝑃 ∈ Word 𝑉 ∧ 1 ≤ (♯‘𝑃)) → 2 ≤ (♯‘(𝑃 ++ ⟨“(𝑃‘0)”⟩)))
25		clwlkclwwlk.v	. . . 4 ⊢ 𝑉 = (Vtx‘𝐺)
26		clwlkclwwlk.e	. . . 4 ⊢ 𝐸 = (iEdg‘𝐺)
27	25, 26	clwlkclwwlk 29252	. . 3 ⊢ ((𝐺 ∈ USPGraph ∧ (𝑃 ++ ⟨“(𝑃‘0)”⟩) ∈ Word 𝑉 ∧ 2 ≤ (♯‘(𝑃 ++ ⟨“(𝑃‘0)”⟩))) → (∃𝑓 𝑓(ClWalks‘𝐺)(𝑃 ++ ⟨“(𝑃‘0)”⟩) ↔ ((lastS‘(𝑃 ++ ⟨“(𝑃‘0)”⟩)) = ((𝑃 ++ ⟨“(𝑃‘0)”⟩)‘0) ∧ ((𝑃 ++ ⟨“(𝑃‘0)”⟩) prefix ((♯‘(𝑃 ++ ⟨“(𝑃‘0)”⟩)) − 1)) ∈ (ClWWalks‘𝐺))))
28	1, 6, 24, 27	syl3anc 1371	. 2 ⊢ ((𝐺 ∈ USPGraph ∧ 𝑃 ∈ Word 𝑉 ∧ 1 ≤ (♯‘𝑃)) → (∃𝑓 𝑓(ClWalks‘𝐺)(𝑃 ++ ⟨“(𝑃‘0)”⟩) ↔ ((lastS‘(𝑃 ++ ⟨“(𝑃‘0)”⟩)) = ((𝑃 ++ ⟨“(𝑃‘0)”⟩)‘0) ∧ ((𝑃 ++ ⟨“(𝑃‘0)”⟩) prefix ((♯‘(𝑃 ++ ⟨“(𝑃‘0)”⟩)) − 1)) ∈ (ClWWalks‘𝐺))))
29		wrdlenccats1lenm1 14571	. . . . . . . 8 ⊢ (𝑃 ∈ Word 𝑉 → ((♯‘(𝑃 ++ ⟨“(𝑃‘0)”⟩)) − 1) = (♯‘𝑃))
30	29	oveq2d 7424	. . . . . . 7 ⊢ (𝑃 ∈ Word 𝑉 → ((𝑃 ++ ⟨“(𝑃‘0)”⟩) prefix ((♯‘(𝑃 ++ ⟨“(𝑃‘0)”⟩)) − 1)) = ((𝑃 ++ ⟨“(𝑃‘0)”⟩) prefix (♯‘𝑃)))
31	30	adantr 481	. . . . . 6 ⊢ ((𝑃 ∈ Word 𝑉 ∧ 1 ≤ (♯‘𝑃)) → ((𝑃 ++ ⟨“(𝑃‘0)”⟩) prefix ((♯‘(𝑃 ++ ⟨“(𝑃‘0)”⟩)) − 1)) = ((𝑃 ++ ⟨“(𝑃‘0)”⟩) prefix (♯‘𝑃)))
32		simpl 483	. . . . . . 7 ⊢ ((𝑃 ∈ Word 𝑉 ∧ 1 ≤ (♯‘𝑃)) → 𝑃 ∈ Word 𝑉)
33		eqidd 2733	. . . . . . 7 ⊢ ((𝑃 ∈ Word 𝑉 ∧ 1 ≤ (♯‘𝑃)) → (♯‘𝑃) = (♯‘𝑃))
34		pfxccatid 14690	. . . . . . 7 ⊢ ((𝑃 ∈ Word 𝑉 ∧ ⟨“(𝑃‘0)”⟩ ∈ Word 𝑉 ∧ (♯‘𝑃) = (♯‘𝑃)) → ((𝑃 ++ ⟨“(𝑃‘0)”⟩) prefix (♯‘𝑃)) = 𝑃)
35	32, 3, 33, 34	syl3anc 1371	. . . . . 6 ⊢ ((𝑃 ∈ Word 𝑉 ∧ 1 ≤ (♯‘𝑃)) → ((𝑃 ++ ⟨“(𝑃‘0)”⟩) prefix (♯‘𝑃)) = 𝑃)
36	31, 35	eqtr2d 2773	. . . . 5 ⊢ ((𝑃 ∈ Word 𝑉 ∧ 1 ≤ (♯‘𝑃)) → 𝑃 = ((𝑃 ++ ⟨“(𝑃‘0)”⟩) prefix ((♯‘(𝑃 ++ ⟨“(𝑃‘0)”⟩)) − 1)))
37	36	eleq1d 2818	. . . 4 ⊢ ((𝑃 ∈ Word 𝑉 ∧ 1 ≤ (♯‘𝑃)) → (𝑃 ∈ (ClWWalks‘𝐺) ↔ ((𝑃 ++ ⟨“(𝑃‘0)”⟩) prefix ((♯‘(𝑃 ++ ⟨“(𝑃‘0)”⟩)) − 1)) ∈ (ClWWalks‘𝐺)))
38		lswccats1fst 14584	. . . . 5 ⊢ ((𝑃 ∈ Word 𝑉 ∧ 1 ≤ (♯‘𝑃)) → (lastS‘(𝑃 ++ ⟨“(𝑃‘0)”⟩)) = ((𝑃 ++ ⟨“(𝑃‘0)”⟩)‘0))
39	38	biantrurd 533	. . . 4 ⊢ ((𝑃 ∈ Word 𝑉 ∧ 1 ≤ (♯‘𝑃)) → (((𝑃 ++ ⟨“(𝑃‘0)”⟩) prefix ((♯‘(𝑃 ++ ⟨“(𝑃‘0)”⟩)) − 1)) ∈ (ClWWalks‘𝐺) ↔ ((lastS‘(𝑃 ++ ⟨“(𝑃‘0)”⟩)) = ((𝑃 ++ ⟨“(𝑃‘0)”⟩)‘0) ∧ ((𝑃 ++ ⟨“(𝑃‘0)”⟩) prefix ((♯‘(𝑃 ++ ⟨“(𝑃‘0)”⟩)) − 1)) ∈ (ClWWalks‘𝐺))))
40	37, 39	bitr2d 279	. . 3 ⊢ ((𝑃 ∈ Word 𝑉 ∧ 1 ≤ (♯‘𝑃)) → (((lastS‘(𝑃 ++ ⟨“(𝑃‘0)”⟩)) = ((𝑃 ++ ⟨“(𝑃‘0)”⟩)‘0) ∧ ((𝑃 ++ ⟨“(𝑃‘0)”⟩) prefix ((♯‘(𝑃 ++ ⟨“(𝑃‘0)”⟩)) − 1)) ∈ (ClWWalks‘𝐺)) ↔ 𝑃 ∈ (ClWWalks‘𝐺)))
41	40	3adant1 1130	. 2 ⊢ ((𝐺 ∈ USPGraph ∧ 𝑃 ∈ Word 𝑉 ∧ 1 ≤ (♯‘𝑃)) → (((lastS‘(𝑃 ++ ⟨“(𝑃‘0)”⟩)) = ((𝑃 ++ ⟨“(𝑃‘0)”⟩)‘0) ∧ ((𝑃 ++ ⟨“(𝑃‘0)”⟩) prefix ((♯‘(𝑃 ++ ⟨“(𝑃‘0)”⟩)) − 1)) ∈ (ClWWalks‘𝐺)) ↔ 𝑃 ∈ (ClWWalks‘𝐺)))
42	28, 41	bitrd 278	1 ⊢ ((𝐺 ∈ USPGraph ∧ 𝑃 ∈ Word 𝑉 ∧ 1 ≤ (♯‘𝑃)) → (∃𝑓 𝑓(ClWalks‘𝐺)(𝑃 ++ ⟨“(𝑃‘0)”⟩) ↔ 𝑃 ∈ (ClWWalks‘𝐺)))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ↔ wb 205 ∧ wa 396 ∧ w3a 1087 = wceq 1541 ∃wex 1781 ∈ wcel 2106 class class class wbr 5148 ‘cfv 6543 (class class class)co 7408 ℝcr 11108 0cc0 11109 1c1 11110 + caddc 11112 ≤ cle 11248 − cmin 11443 2c2 12266 ℕ₀cn0 12471 ♯chash 14289 Word cword 14463 lastSclsw 14511 ++ cconcat 14519 ⟨“cs1 14544 prefix cpfx 14619 Vtxcvtx 28253 iEdgciedg 28254 USPGraphcuspgr 28405 ClWalkscclwlks 29024 ClWWalkscclwwlk 29231

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 1913 ax-6 1971 ax-7 2011 ax-8 2108 ax-9 2116 ax-10 2137 ax-11 2154 ax-12 2171 ax-ext 2703 ax-rep 5285 ax-sep 5299 ax-nul 5306 ax-pow 5363 ax-pr 5427 ax-un 7724 ax-cnex 11165 ax-resscn 11166 ax-1cn 11167 ax-icn 11168 ax-addcl 11169 ax-addrcl 11170 ax-mulcl 11171 ax-mulrcl 11172 ax-mulcom 11173 ax-addass 11174 ax-mulass 11175 ax-distr 11176 ax-i2m1 11177 ax-1ne0 11178 ax-1rid 11179 ax-rnegex 11180 ax-rrecex 11181 ax-cnre 11182 ax-pre-lttri 11183 ax-pre-lttrn 11184 ax-pre-ltadd 11185 ax-pre-mulgt0 11186

This theorem depends on definitions: df-bi 206 df-an 397 df-or 846 df-ifp 1062 df-3or 1088 df-3an 1089 df-tru 1544 df-fal 1554 df-ex 1782 df-nf 1786 df-sb 2068 df-mo 2534 df-eu 2563 df-clab 2710 df-cleq 2724 df-clel 2810 df-nfc 2885 df-ne 2941 df-nel 3047 df-ral 3062 df-rex 3071 df-reu 3377 df-rab 3433 df-v 3476 df-sbc 3778 df-csb 3894 df-dif 3951 df-un 3953 df-in 3955 df-ss 3965 df-pss 3967 df-nul 4323 df-if 4529 df-pw 4604 df-sn 4629 df-pr 4631 df-op 4635 df-uni 4909 df-int 4951 df-iun 4999 df-br 5149 df-opab 5211 df-mpt 5232 df-tr 5266 df-id 5574 df-eprel 5580 df-po 5588 df-so 5589 df-fr 5631 df-we 5633 df-xp 5682 df-rel 5683 df-cnv 5684 df-co 5685 df-dm 5686 df-rn 5687 df-res 5688 df-ima 5689 df-pred 6300 df-ord 6367 df-on 6368 df-lim 6369 df-suc 6370 df-iota 6495 df-fun 6545 df-fn 6546 df-f 6547 df-f1 6548 df-fo 6549 df-f1o 6550 df-fv 6551 df-riota 7364 df-ov 7411 df-oprab 7412 df-mpo 7413 df-om 7855 df-1st 7974 df-2nd 7975 df-frecs 8265 df-wrecs 8296 df-recs 8370 df-rdg 8409 df-1o 8465 df-2o 8466 df-oadd 8469 df-er 8702 df-map 8821 df-pm 8822 df-en 8939 df-dom 8940 df-sdom 8941 df-fin 8942 df-dju 9895 df-card 9933 df-pnf 11249 df-mnf 11250 df-xr 11251 df-ltxr 11252 df-le 11253 df-sub 11445 df-neg 11446 df-nn 12212 df-2 12274 df-n0 12472 df-xnn0 12544 df-z 12558 df-uz 12822 df-rp 12974 df-fz 13484 df-fzo 13627 df-hash 14290 df-word 14464 df-lsw 14512 df-concat 14520 df-s1 14545 df-substr 14590 df-pfx 14620 df-edg 28305 df-uhgr 28315 df-upgr 28339 df-uspgr 28407 df-wlks 28853 df-clwlks 29025 df-clwwlk 29232

This theorem is referenced by: clwlkclwwlkfo 29259

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