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Theorem clwlkcomp 29862

Description: A closed walk expressed by properties of its components. (Contributed by Alexander van der Vekens, 24-Jun-2018.) (Revised by AV, 17-Feb-2021.)

**Hypotheses**
Ref	Expression
isclwlke.v	⊢ 𝑉 = (Vtx‘𝐺)
isclwlke.i	⊢ 𝐼 = (iEdg‘𝐺)
clwlkcomp.1	⊢ 𝐹 = (1^st ‘𝑊)
clwlkcomp.2	⊢ 𝑃 = (2^nd ‘𝑊)

**Assertion**
Ref	Expression
clwlkcomp	⊢ ((𝐺 ∈ 𝑋 ∧ 𝑊 ∈ (𝑆 × 𝑇)) → (𝑊 ∈ (ClWalks‘𝐺) ↔ ((𝐹 ∈ Word dom 𝐼 ∧ 𝑃:(0...(♯‘𝐹))⟶𝑉) ∧ (∀𝑘 ∈ (0..^(♯‘𝐹))if-((𝑃‘𝑘) = (𝑃‘(𝑘 + 1)), (𝐼‘(𝐹‘𝑘)) = {(𝑃‘𝑘)}, {(𝑃‘𝑘), (𝑃‘(𝑘 + 1))} ⊆ (𝐼‘(𝐹‘𝑘))) ∧ (𝑃‘0) = (𝑃‘(♯‘𝐹))))))

Distinct variable groups: 𝑘,𝐹 𝑘,𝐺 𝑃,𝑘 𝑘,𝐼 𝑘,𝑉 Allowed substitution hints: 𝑆(𝑘) 𝑇(𝑘) 𝑊(𝑘) 𝑋(𝑘)

**Proof of Theorem clwlkcomp**
Step	Hyp	Ref	Expression
1		clwlkcomp.1	. . . . . . 7 ⊢ 𝐹 = (1^st ‘𝑊)
2	1	eqcomi 2746	. . . . . 6 ⊢ (1^st ‘𝑊) = 𝐹
3		clwlkcomp.2	. . . . . . 7 ⊢ 𝑃 = (2^nd ‘𝑊)
4	3	eqcomi 2746	. . . . . 6 ⊢ (2^nd ‘𝑊) = 𝑃
5	2, 4	pm3.2i 470	. . . . 5 ⊢ ((1^st ‘𝑊) = 𝐹 ∧ (2^nd ‘𝑊) = 𝑃)
6		eqop 7977	. . . . 5 ⊢ (𝑊 ∈ (𝑆 × 𝑇) → (𝑊 = ⟨𝐹, 𝑃⟩ ↔ ((1^st ‘𝑊) = 𝐹 ∧ (2^nd ‘𝑊) = 𝑃)))
7	5, 6	mpbiri 258	. . . 4 ⊢ (𝑊 ∈ (𝑆 × 𝑇) → 𝑊 = ⟨𝐹, 𝑃⟩)
8	7	eleq1d 2822	. . 3 ⊢ (𝑊 ∈ (𝑆 × 𝑇) → (𝑊 ∈ (ClWalks‘𝐺) ↔ ⟨𝐹, 𝑃⟩ ∈ (ClWalks‘𝐺)))
9		df-br 5087	. . 3 ⊢ (𝐹(ClWalks‘𝐺)𝑃 ↔ ⟨𝐹, 𝑃⟩ ∈ (ClWalks‘𝐺))
10	8, 9	bitr4di 289	. 2 ⊢ (𝑊 ∈ (𝑆 × 𝑇) → (𝑊 ∈ (ClWalks‘𝐺) ↔ 𝐹(ClWalks‘𝐺)𝑃))
11		isclwlke.v	. . 3 ⊢ 𝑉 = (Vtx‘𝐺)
12		isclwlke.i	. . 3 ⊢ 𝐼 = (iEdg‘𝐺)
13	11, 12	isclwlke 29860	. 2 ⊢ (𝐺 ∈ 𝑋 → (𝐹(ClWalks‘𝐺)𝑃 ↔ ((𝐹 ∈ Word dom 𝐼 ∧ 𝑃:(0...(♯‘𝐹))⟶𝑉) ∧ (∀𝑘 ∈ (0..^(♯‘𝐹))if-((𝑃‘𝑘) = (𝑃‘(𝑘 + 1)), (𝐼‘(𝐹‘𝑘)) = {(𝑃‘𝑘)}, {(𝑃‘𝑘), (𝑃‘(𝑘 + 1))} ⊆ (𝐼‘(𝐹‘𝑘))) ∧ (𝑃‘0) = (𝑃‘(♯‘𝐹))))))
14	10, 13	sylan9bbr 510	1 ⊢ ((𝐺 ∈ 𝑋 ∧ 𝑊 ∈ (𝑆 × 𝑇)) → (𝑊 ∈ (ClWalks‘𝐺) ↔ ((𝐹 ∈ Word dom 𝐼 ∧ 𝑃:(0...(♯‘𝐹))⟶𝑉) ∧ (∀𝑘 ∈ (0..^(♯‘𝐹))if-((𝑃‘𝑘) = (𝑃‘(𝑘 + 1)), (𝐼‘(𝐹‘𝑘)) = {(𝑃‘𝑘)}, {(𝑃‘𝑘), (𝑃‘(𝑘 + 1))} ⊆ (𝐼‘(𝐹‘𝑘))) ∧ (𝑃‘0) = (𝑃‘(♯‘𝐹))))))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ↔ wb 206 ∧ wa 395 if-wif 1063 = wceq 1542 ∈ wcel 2114 ∀wral 3052 ⊆ wss 3890 {csn 4568 {cpr 4570 ⟨cop 4574 class class class wbr 5086 × cxp 5622 dom cdm 5624 ⟶wf 6488 ‘cfv 6492 (class class class)co 7360 1^st c1st 7933 2^nd c2nd 7934 0cc0 11029 1c1 11030 + caddc 11032 ...cfz 13452 ..^cfzo 13599 ♯chash 14283 Word cword 14466 Vtxcvtx 29079 iEdgciedg 29080 ClWalkscclwlks 29853

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 5212 ax-sep 5231 ax-nul 5241 ax-pow 5302 ax-pr 5370 ax-un 7682 ax-cnex 11085 ax-resscn 11086 ax-1cn 11087 ax-icn 11088 ax-addcl 11089 ax-addrcl 11090 ax-mulcl 11091 ax-mulrcl 11092 ax-mulcom 11093 ax-addass 11094 ax-mulass 11095 ax-distr 11096 ax-i2m1 11097 ax-1ne0 11098 ax-1rid 11099 ax-rnegex 11100 ax-rrecex 11101 ax-cnre 11102 ax-pre-lttri 11103 ax-pre-lttrn 11104 ax-pre-ltadd 11105 ax-pre-mulgt0 11106

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 5519 df-eprel 5524 df-po 5532 df-so 5533 df-fr 5577 df-we 5579 df-xp 5630 df-rel 5631 df-cnv 5632 df-co 5633 df-dm 5634 df-rn 5635 df-res 5636 df-ima 5637 df-pred 6259 df-ord 6320 df-on 6321 df-lim 6322 df-suc 6323 df-iota 6448 df-fun 6494 df-fn 6495 df-f 6496 df-f1 6497 df-fo 6498 df-f1o 6499 df-fv 6500 df-riota 7317 df-ov 7363 df-oprab 7364 df-mpo 7365 df-om 7811 df-1st 7935 df-2nd 7936 df-frecs 8224 df-wrecs 8255 df-recs 8304 df-rdg 8342 df-1o 8398 df-er 8636 df-map 8768 df-pm 8769 df-en 8887 df-dom 8888 df-sdom 8889 df-fin 8890 df-card 9854 df-pnf 11172 df-mnf 11173 df-xr 11174 df-ltxr 11175 df-le 11176 df-sub 11370 df-neg 11371 df-nn 12166 df-n0 12429 df-z 12516 df-uz 12780 df-fz 13453 df-fzo 13600 df-hash 14284 df-word 14467 df-wlks 29683 df-clwlks 29854

This theorem is referenced by: clwlkcompim 29863

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