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Theorem clwwlknon 29944

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 2737	. . . 4 ⊢ (𝑣 = 𝑋 → ((𝑤‘0) = 𝑣 ↔ (𝑤‘0) = 𝑋))
2	1	rabbidv 3427	. . 3 ⊢ (𝑣 = 𝑋 → {𝑤 ∈ (𝑛 ClWWalksN 𝐺) ∣ (𝑤‘0) = 𝑣} = {𝑤 ∈ (𝑛 ClWWalksN 𝐺) ∣ (𝑤‘0) = 𝑋})
3		oveq1 7423	. . . 4 ⊢ (𝑛 = 𝑁 → (𝑛 ClWWalksN 𝐺) = (𝑁 ClWWalksN 𝐺))
4	3	rabeqdv 3435	. . 3 ⊢ (𝑛 = 𝑁 → {𝑤 ∈ (𝑛 ClWWalksN 𝐺) ∣ (𝑤‘0) = 𝑋} = {𝑤 ∈ (𝑁 ClWWalksN 𝐺) ∣ (𝑤‘0) = 𝑋})
5		clwwlknonmpo 29943	. . 3 ⊢ (ClWWalksNOn‘𝐺) = (𝑣 ∈ (Vtx‘𝐺), 𝑛 ∈ ℕ₀ ↦ {𝑤 ∈ (𝑛 ClWWalksN 𝐺) ∣ (𝑤‘0) = 𝑣})
6		ovex 7449	. . . 4 ⊢ (𝑁 ClWWalksN 𝐺) ∈ V
7	6	rabex 5329	. . 3 ⊢ {𝑤 ∈ (𝑁 ClWWalksN 𝐺) ∣ (𝑤‘0) = 𝑋} ∈ V
8	2, 4, 5, 7	ovmpo 7578	. 2 ⊢ ((𝑋 ∈ (Vtx‘𝐺) ∧ 𝑁 ∈ ℕ₀) → (𝑋(ClWWalksNOn‘𝐺)𝑁) = {𝑤 ∈ (𝑁 ClWWalksN 𝐺) ∣ (𝑤‘0) = 𝑋})
9	5	mpondm0 7658	. . 3 ⊢ (¬ (𝑋 ∈ (Vtx‘𝐺) ∧ 𝑁 ∈ ℕ₀) → (𝑋(ClWWalksNOn‘𝐺)𝑁) = ∅)
10		isclwwlkn 29881	. . . . . . . . . . 11 ⊢ (𝑤 ∈ (𝑁 ClWWalksN 𝐺) ↔ (𝑤 ∈ (ClWWalks‘𝐺) ∧ (♯‘𝑤) = 𝑁))
11		eqid 2725	. . . . . . . . . . . . . 14 ⊢ (Vtx‘𝐺) = (Vtx‘𝐺)
12	11	clwwlkbp 29839	. . . . . . . . . . . . 13 ⊢ (𝑤 ∈ (ClWWalks‘𝐺) → (𝐺 ∈ V ∧ 𝑤 ∈ Word (Vtx‘𝐺) ∧ 𝑤 ≠ ∅))
13		fstwrdne 14537	. . . . . . . . . . . . . 14 ⊢ ((𝑤 ∈ Word (Vtx‘𝐺) ∧ 𝑤 ≠ ∅) → (𝑤‘0) ∈ (Vtx‘𝐺))
14	13	3adant1 1127	. . . . . . . . . . . . 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 479	. . . . . . . . . . 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 479	. . . . . . . . 9 ⊢ ((𝑤 ∈ (𝑁 ClWWalksN 𝐺) ∧ (𝑤‘0) = 𝑋) → (𝑤‘0) ∈ (Vtx‘𝐺))
19		eleq1 2813	. . . . . . . . . 10 ⊢ ((𝑤‘0) = 𝑋 → ((𝑤‘0) ∈ (Vtx‘𝐺) ↔ 𝑋 ∈ (Vtx‘𝐺)))
20	19	adantl 480	. . . . . . . . 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 29887	. . . . . . . . . 10 ⊢ (𝑤 ∈ (𝑁 ClWWalksN 𝐺) → 𝑁 ∈ ℕ)
23	22	nnnn0d 12562	. . . . . . . . 9 ⊢ (𝑤 ∈ (𝑁 ClWWalksN 𝐺) → 𝑁 ∈ ℕ₀)
24	23	adantr 479	. . . . . . . 8 ⊢ ((𝑤 ∈ (𝑁 ClWWalksN 𝐺) ∧ (𝑤‘0) = 𝑋) → 𝑁 ∈ ℕ₀)
25	21, 24	jca 510	. . . . . . 7 ⊢ ((𝑤 ∈ (𝑁 ClWWalksN 𝐺) ∧ (𝑤‘0) = 𝑋) → (𝑋 ∈ (Vtx‘𝐺) ∧ 𝑁 ∈ ℕ₀))
26	25	ex 411	. . . . . 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 3135	. . . 4 ⊢ (¬ (𝑋 ∈ (Vtx‘𝐺) ∧ 𝑁 ∈ ℕ₀) → ∀𝑤 ∈ (𝑁 ClWWalksN 𝐺) ¬ (𝑤‘0) = 𝑋)
29		rabeq0 4380	. . . 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 2768	. 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 394 ∧ w3a 1084 = wceq 1533 ∈ wcel 2098 ≠ wne 2930 ∀wral 3051 {crab 3419 Vcvv 3463 ∅c0 4318 ‘cfv 6543 (class class class)co 7416 0cc0 11138 ℕ₀cn0 12502 ♯chash 14321 Word cword 14496 Vtxcvtx 28853 ClWWalkscclwwlk 29835 ClWWalksN cclwwlkn 29878 ClWWalksNOncclwwlknon 29941

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1789 ax-4 1803 ax-5 1905 ax-6 1963 ax-7 2003 ax-8 2100 ax-9 2108 ax-10 2129 ax-11 2146 ax-12 2166 ax-ext 2696 ax-rep 5280 ax-sep 5294 ax-nul 5301 ax-pow 5359 ax-pr 5423 ax-un 7738 ax-cnex 11194 ax-resscn 11195 ax-1cn 11196 ax-icn 11197 ax-addcl 11198 ax-addrcl 11199 ax-mulcl 11200 ax-mulrcl 11201 ax-mulcom 11202 ax-addass 11203 ax-mulass 11204 ax-distr 11205 ax-i2m1 11206 ax-1ne0 11207 ax-1rid 11208 ax-rnegex 11209 ax-rrecex 11210 ax-cnre 11211 ax-pre-lttri 11212 ax-pre-lttrn 11213 ax-pre-ltadd 11214 ax-pre-mulgt0 11215

This theorem depends on definitions: df-bi 206 df-an 395 df-or 846 df-3or 1085 df-3an 1086 df-tru 1536 df-fal 1546 df-ex 1774 df-nf 1778 df-sb 2060 df-mo 2528 df-eu 2557 df-clab 2703 df-cleq 2717 df-clel 2802 df-nfc 2877 df-ne 2931 df-nel 3037 df-ral 3052 df-rex 3061 df-reu 3365 df-rab 3420 df-v 3465 df-sbc 3769 df-csb 3885 df-dif 3942 df-un 3944 df-in 3946 df-ss 3956 df-pss 3959 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 5144 df-opab 5206 df-mpt 5227 df-tr 5261 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 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 7372 df-ov 7419 df-oprab 7420 df-mpo 7421 df-om 7869 df-1st 7991 df-2nd 7992 df-frecs 8285 df-wrecs 8316 df-recs 8390 df-rdg 8429 df-1o 8485 df-oadd 8489 df-er 8723 df-map 8845 df-en 8963 df-dom 8964 df-sdom 8965 df-fin 8966 df-card 9962 df-pnf 11280 df-mnf 11281 df-xr 11282 df-ltxr 11283 df-le 11284 df-sub 11476 df-neg 11477 df-nn 12243 df-n0 12503 df-xnn0 12575 df-z 12589 df-uz 12853 df-fz 13517 df-fzo 13660 df-hash 14322 df-word 14497 df-clwwlk 29836 df-clwwlkn 29879 df-clwwlknon 29942

This theorem is referenced by: isclwwlknon 29945 clwwlknonfin 29948 clwwlknon1 29951 clwwlknon2 29956 clwwlknondisj 29965 clwwlkvbij 29967 extwwlkfab 30206 clwwlknonclwlknonf1o 30216

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