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Theorem clwwlknon 29332

Description: The set of closed walks on vertex 𝑋 of length 𝑁 in a graph 𝐺 as words over the set of vertices. (Contributed by Alexander van der Vekens, 14-Sep-2018.) (Revised by AV, 28-May-2021.) (Revised by AV, 24-Mar-2022.)

**Assertion**
Ref	Expression
clwwlknon	⊢ (𝑋(ClWWalksNOn‘𝐺)𝑁) = {𝑤 ∈ (𝑁 ClWWalksN 𝐺) ∣ (𝑤‘0) = 𝑋}

Distinct variable groups: 𝑤,𝐺 𝑤,𝑁 𝑤,𝑋

Proof of Theorem clwwlknon Dummy variables 𝑛 𝑣 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		eqeq2 2744	. . . 4 ⊢ (𝑣 = 𝑋 → ((𝑤‘0) = 𝑣 ↔ (𝑤‘0) = 𝑋))
2	1	rabbidv 3440	. . 3 ⊢ (𝑣 = 𝑋 → {𝑤 ∈ (𝑛 ClWWalksN 𝐺) ∣ (𝑤‘0) = 𝑣} = {𝑤 ∈ (𝑛 ClWWalksN 𝐺) ∣ (𝑤‘0) = 𝑋})
3		oveq1 7412	. . . 4 ⊢ (𝑛 = 𝑁 → (𝑛 ClWWalksN 𝐺) = (𝑁 ClWWalksN 𝐺))
4	3	rabeqdv 3447	. . 3 ⊢ (𝑛 = 𝑁 → {𝑤 ∈ (𝑛 ClWWalksN 𝐺) ∣ (𝑤‘0) = 𝑋} = {𝑤 ∈ (𝑁 ClWWalksN 𝐺) ∣ (𝑤‘0) = 𝑋})
5		clwwlknonmpo 29331	. . 3 ⊢ (ClWWalksNOn‘𝐺) = (𝑣 ∈ (Vtx‘𝐺), 𝑛 ∈ ℕ₀ ↦ {𝑤 ∈ (𝑛 ClWWalksN 𝐺) ∣ (𝑤‘0) = 𝑣})
6		ovex 7438	. . . 4 ⊢ (𝑁 ClWWalksN 𝐺) ∈ V
7	6	rabex 5331	. . 3 ⊢ {𝑤 ∈ (𝑁 ClWWalksN 𝐺) ∣ (𝑤‘0) = 𝑋} ∈ V
8	2, 4, 5, 7	ovmpo 7564	. 2 ⊢ ((𝑋 ∈ (Vtx‘𝐺) ∧ 𝑁 ∈ ℕ₀) → (𝑋(ClWWalksNOn‘𝐺)𝑁) = {𝑤 ∈ (𝑁 ClWWalksN 𝐺) ∣ (𝑤‘0) = 𝑋})
9	5	mpondm0 7643	. . 3 ⊢ (¬ (𝑋 ∈ (Vtx‘𝐺) ∧ 𝑁 ∈ ℕ₀) → (𝑋(ClWWalksNOn‘𝐺)𝑁) = ∅)
10		isclwwlkn 29269	. . . . . . . . . . 11 ⊢ (𝑤 ∈ (𝑁 ClWWalksN 𝐺) ↔ (𝑤 ∈ (ClWWalks‘𝐺) ∧ (♯‘𝑤) = 𝑁))
11		eqid 2732	. . . . . . . . . . . . . 14 ⊢ (Vtx‘𝐺) = (Vtx‘𝐺)
12	11	clwwlkbp 29227	. . . . . . . . . . . . 13 ⊢ (𝑤 ∈ (ClWWalks‘𝐺) → (𝐺 ∈ V ∧ 𝑤 ∈ Word (Vtx‘𝐺) ∧ 𝑤 ≠ ∅))
13		fstwrdne 14501	. . . . . . . . . . . . . 14 ⊢ ((𝑤 ∈ Word (Vtx‘𝐺) ∧ 𝑤 ≠ ∅) → (𝑤‘0) ∈ (Vtx‘𝐺))
14	13	3adant1 1130	. . . . . . . . . . . . 13 ⊢ ((𝐺 ∈ V ∧ 𝑤 ∈ Word (Vtx‘𝐺) ∧ 𝑤 ≠ ∅) → (𝑤‘0) ∈ (Vtx‘𝐺))
15	12, 14	syl 17	. . . . . . . . . . . 12 ⊢ (𝑤 ∈ (ClWWalks‘𝐺) → (𝑤‘0) ∈ (Vtx‘𝐺))
16	15	adantr 481	. . . . . . . . . . 11 ⊢ ((𝑤 ∈ (ClWWalks‘𝐺) ∧ (♯‘𝑤) = 𝑁) → (𝑤‘0) ∈ (Vtx‘𝐺))
17	10, 16	sylbi 216	. . . . . . . . . 10 ⊢ (𝑤 ∈ (𝑁 ClWWalksN 𝐺) → (𝑤‘0) ∈ (Vtx‘𝐺))
18	17	adantr 481	. . . . . . . . 9 ⊢ ((𝑤 ∈ (𝑁 ClWWalksN 𝐺) ∧ (𝑤‘0) = 𝑋) → (𝑤‘0) ∈ (Vtx‘𝐺))
19		eleq1 2821	. . . . . . . . . 10 ⊢ ((𝑤‘0) = 𝑋 → ((𝑤‘0) ∈ (Vtx‘𝐺) ↔ 𝑋 ∈ (Vtx‘𝐺)))
20	19	adantl 482	. . . . . . . . 9 ⊢ ((𝑤 ∈ (𝑁 ClWWalksN 𝐺) ∧ (𝑤‘0) = 𝑋) → ((𝑤‘0) ∈ (Vtx‘𝐺) ↔ 𝑋 ∈ (Vtx‘𝐺)))
21	18, 20	mpbid 231	. . . . . . . 8 ⊢ ((𝑤 ∈ (𝑁 ClWWalksN 𝐺) ∧ (𝑤‘0) = 𝑋) → 𝑋 ∈ (Vtx‘𝐺))
22		clwwlknnn 29275	. . . . . . . . . 10 ⊢ (𝑤 ∈ (𝑁 ClWWalksN 𝐺) → 𝑁 ∈ ℕ)
23	22	nnnn0d 12528	. . . . . . . . 9 ⊢ (𝑤 ∈ (𝑁 ClWWalksN 𝐺) → 𝑁 ∈ ℕ₀)
24	23	adantr 481	. . . . . . . 8 ⊢ ((𝑤 ∈ (𝑁 ClWWalksN 𝐺) ∧ (𝑤‘0) = 𝑋) → 𝑁 ∈ ℕ₀)
25	21, 24	jca 512	. . . . . . 7 ⊢ ((𝑤 ∈ (𝑁 ClWWalksN 𝐺) ∧ (𝑤‘0) = 𝑋) → (𝑋 ∈ (Vtx‘𝐺) ∧ 𝑁 ∈ ℕ₀))
26	25	ex 413	. . . . . 6 ⊢ (𝑤 ∈ (𝑁 ClWWalksN 𝐺) → ((𝑤‘0) = 𝑋 → (𝑋 ∈ (Vtx‘𝐺) ∧ 𝑁 ∈ ℕ₀)))
27	26	con3rr3 155	. . . . 5 ⊢ (¬ (𝑋 ∈ (Vtx‘𝐺) ∧ 𝑁 ∈ ℕ₀) → (𝑤 ∈ (𝑁 ClWWalksN 𝐺) → ¬ (𝑤‘0) = 𝑋))
28	27	ralrimiv 3145	. . . 4 ⊢ (¬ (𝑋 ∈ (Vtx‘𝐺) ∧ 𝑁 ∈ ℕ₀) → ∀𝑤 ∈ (𝑁 ClWWalksN 𝐺) ¬ (𝑤‘0) = 𝑋)
29		rabeq0 4383	. . . 4 ⊢ ({𝑤 ∈ (𝑁 ClWWalksN 𝐺) ∣ (𝑤‘0) = 𝑋} = ∅ ↔ ∀𝑤 ∈ (𝑁 ClWWalksN 𝐺) ¬ (𝑤‘0) = 𝑋)
30	28, 29	sylibr 233	. . 3 ⊢ (¬ (𝑋 ∈ (Vtx‘𝐺) ∧ 𝑁 ∈ ℕ₀) → {𝑤 ∈ (𝑁 ClWWalksN 𝐺) ∣ (𝑤‘0) = 𝑋} = ∅)
31	9, 30	eqtr4d 2775	. 2 ⊢ (¬ (𝑋 ∈ (Vtx‘𝐺) ∧ 𝑁 ∈ ℕ₀) → (𝑋(ClWWalksNOn‘𝐺)𝑁) = {𝑤 ∈ (𝑁 ClWWalksN 𝐺) ∣ (𝑤‘0) = 𝑋})
32	8, 31	pm2.61i 182	1 ⊢ (𝑋(ClWWalksNOn‘𝐺)𝑁) = {𝑤 ∈ (𝑁 ClWWalksN 𝐺) ∣ (𝑤‘0) = 𝑋}

Colors of variables: wff setvar class

Syntax hints: ¬ wn 3 ↔ wb 205 ∧ wa 396 ∧ w3a 1087 = wceq 1541 ∈ wcel 2106 ≠ wne 2940 ∀wral 3061 {crab 3432 Vcvv 3474 ∅c0 4321 ‘cfv 6540 (class class class)co 7405 0cc0 11106 ℕ₀cn0 12468 ♯chash 14286 Word cword 14460 Vtxcvtx 28245 ClWWalkscclwwlk 29223 ClWWalksN cclwwlkn 29266 ClWWalksNOncclwwlknon 29329

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 5284 ax-sep 5298 ax-nul 5305 ax-pow 5362 ax-pr 5426 ax-un 7721 ax-cnex 11162 ax-resscn 11163 ax-1cn 11164 ax-icn 11165 ax-addcl 11166 ax-addrcl 11167 ax-mulcl 11168 ax-mulrcl 11169 ax-mulcom 11170 ax-addass 11171 ax-mulass 11172 ax-distr 11173 ax-i2m1 11174 ax-1ne0 11175 ax-1rid 11176 ax-rnegex 11177 ax-rrecex 11178 ax-cnre 11179 ax-pre-lttri 11180 ax-pre-lttrn 11181 ax-pre-ltadd 11182 ax-pre-mulgt0 11183

This theorem depends on definitions: df-bi 206 df-an 397 df-or 846 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 3777 df-csb 3893 df-dif 3950 df-un 3952 df-in 3954 df-ss 3964 df-pss 3966 df-nul 4322 df-if 4528 df-pw 4603 df-sn 4628 df-pr 4630 df-op 4634 df-uni 4908 df-int 4950 df-iun 4998 df-br 5148 df-opab 5210 df-mpt 5231 df-tr 5265 df-id 5573 df-eprel 5579 df-po 5587 df-so 5588 df-fr 5630 df-we 5632 df-xp 5681 df-rel 5682 df-cnv 5683 df-co 5684 df-dm 5685 df-rn 5686 df-res 5687 df-ima 5688 df-pred 6297 df-ord 6364 df-on 6365 df-lim 6366 df-suc 6367 df-iota 6492 df-fun 6542 df-fn 6543 df-f 6544 df-f1 6545 df-fo 6546 df-f1o 6547 df-fv 6548 df-riota 7361 df-ov 7408 df-oprab 7409 df-mpo 7410 df-om 7852 df-1st 7971 df-2nd 7972 df-frecs 8262 df-wrecs 8293 df-recs 8367 df-rdg 8406 df-1o 8462 df-oadd 8466 df-er 8699 df-map 8818 df-en 8936 df-dom 8937 df-sdom 8938 df-fin 8939 df-card 9930 df-pnf 11246 df-mnf 11247 df-xr 11248 df-ltxr 11249 df-le 11250 df-sub 11442 df-neg 11443 df-nn 12209 df-n0 12469 df-xnn0 12541 df-z 12555 df-uz 12819 df-fz 13481 df-fzo 13624 df-hash 14287 df-word 14461 df-clwwlk 29224 df-clwwlkn 29267 df-clwwlknon 29330

This theorem is referenced by: isclwwlknon 29333 clwwlknonfin 29336 clwwlknon1 29339 clwwlknon2 29344 clwwlknondisj 29353 clwwlkvbij 29355 extwwlkfab 29594 clwwlknonclwlknonf1o 29604

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