Theorem clwwlkn 28291

Description: The set of closed walks of a fixed length 𝑁 as words over the set of vertices in a graph 𝐺. (Contributed by Alexander van der Vekens, 20-Mar-2018.) (Revised by AV, 24-Apr-2021.) (Revised by AV, 22-Mar-2022.)

Assertion

Ref	Expression
clwwlkn	⊢ (𝑁 ClWWalksN 𝐺) = {𝑤 ∈ (ClWWalks‘𝐺) ∣ (♯‘𝑤) = 𝑁}

Distinct variable groups:   𝑤,𝐺   𝑤,𝑁

Proof of Theorem clwwlkn

Dummy variables 𝑔 𝑛 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		fveq2 6756	. . . . 5 ⊢ (𝑔 = 𝐺 → (ClWWalks‘𝑔) = (ClWWalks‘𝐺))
2	1	adantl 481	. . . 4 ⊢ ((𝑛 = 𝑁 ∧ 𝑔 = 𝐺) → (ClWWalks‘𝑔) = (ClWWalks‘𝐺))
3		eqeq2 2750	. . . . 5 ⊢ (𝑛 = 𝑁 → ((♯‘𝑤) = 𝑛 ↔ (♯‘𝑤) = 𝑁))
4	3	adantr 480	. . . 4 ⊢ ((𝑛 = 𝑁 ∧ 𝑔 = 𝐺) → ((♯‘𝑤) = 𝑛 ↔ (♯‘𝑤) = 𝑁))
5	2, 4	rabeqbidv 3410	. . 3 ⊢ ((𝑛 = 𝑁 ∧ 𝑔 = 𝐺) → {𝑤 ∈ (ClWWalks‘𝑔) ∣ (♯‘𝑤) = 𝑛} = {𝑤 ∈ (ClWWalks‘𝐺) ∣ (♯‘𝑤) = 𝑁})
6		df-clwwlkn 28290	. . 3 ⊢ ClWWalksN = (𝑛 ∈ ℕ0, 𝑔 ∈ V ↦ {𝑤 ∈ (ClWWalks‘𝑔) ∣ (♯‘𝑤) = 𝑛})
7		fvex 6769	. . . 4 ⊢ (ClWWalks‘𝐺) ∈ V
8	7	rabex 5251	. . 3 ⊢ {𝑤 ∈ (ClWWalks‘𝐺) ∣ (♯‘𝑤) = 𝑁} ∈ V
9	5, 6, 8	ovmpoa 7406	. 2 ⊢ ((𝑁 ∈ ℕ0 ∧ 𝐺 ∈ V) → (𝑁 ClWWalksN 𝐺) = {𝑤 ∈ (ClWWalks‘𝐺) ∣ (♯‘𝑤) = 𝑁})
10	6	mpondm0 7488	. . 3 ⊢ (¬ (𝑁 ∈ ℕ0 ∧ 𝐺 ∈ V) → (𝑁 ClWWalksN 𝐺) = ∅)
11		eqid 2738	. . . . . . . . . . 11 ⊢ (Vtx‘𝐺) = (Vtx‘𝐺)
12	11	clwwlkbp 28250	. . . . . . . . . 10 ⊢ (𝑤 ∈ (ClWWalks‘𝐺) → (𝐺 ∈ V ∧ 𝑤 ∈ Word (Vtx‘𝐺) ∧ 𝑤 ≠ ∅))
13	12	simp2d 1141	. . . . . . . . 9 ⊢ (𝑤 ∈ (ClWWalks‘𝐺) → 𝑤 ∈ Word (Vtx‘𝐺))
14		lencl 14164	. . . . . . . . 9 ⊢ (𝑤 ∈ Word (Vtx‘𝐺) → (♯‘𝑤) ∈ ℕ0)
15	13, 14	syl 17	. . . . . . . 8 ⊢ (𝑤 ∈ (ClWWalks‘𝐺) → (♯‘𝑤) ∈ ℕ0)
16		eleq1 2826	. . . . . . . 8 ⊢ ((♯‘𝑤) = 𝑁 → ((♯‘𝑤) ∈ ℕ0 ↔ 𝑁 ∈ ℕ0))
17	15, 16	syl5ibcom 244	. . . . . . 7 ⊢ (𝑤 ∈ (ClWWalks‘𝐺) → ((♯‘𝑤) = 𝑁 → 𝑁 ∈ ℕ0))
18	17	con3rr3 155	. . . . . 6 ⊢ (¬ 𝑁 ∈ ℕ0 → (𝑤 ∈ (ClWWalks‘𝐺) → ¬ (♯‘𝑤) = 𝑁))
19	18	ralrimiv 3106	. . . . 5 ⊢ (¬ 𝑁 ∈ ℕ0 → ∀𝑤 ∈ (ClWWalks‘𝐺) ¬ (♯‘𝑤) = 𝑁)
20		ral0 4440	. . . . . 6 ⊢ ∀𝑤 ∈ ∅ ¬ (♯‘𝑤) = 𝑁
21		fvprc 6748	. . . . . . 7 ⊢ (¬ 𝐺 ∈ V → (ClWWalks‘𝐺) = ∅)
22	21	raleqdv 3339	. . . . . 6 ⊢ (¬ 𝐺 ∈ V → (∀𝑤 ∈ (ClWWalks‘𝐺) ¬ (♯‘𝑤) = 𝑁 ↔ ∀𝑤 ∈ ∅ ¬ (♯‘𝑤) = 𝑁))
23	20, 22	mpbiri 257	. . . . 5 ⊢ (¬ 𝐺 ∈ V → ∀𝑤 ∈ (ClWWalks‘𝐺) ¬ (♯‘𝑤) = 𝑁)
24	19, 23	jaoi 853	. . . 4 ⊢ ((¬ 𝑁 ∈ ℕ0 ∨ ¬ 𝐺 ∈ V) → ∀𝑤 ∈ (ClWWalks‘𝐺) ¬ (♯‘𝑤) = 𝑁)
25		ianor 978	. . . 4 ⊢ (¬ (𝑁 ∈ ℕ0 ∧ 𝐺 ∈ V) ↔ (¬ 𝑁 ∈ ℕ0 ∨ ¬ 𝐺 ∈ V))
26		rabeq0 4315	. . . 4 ⊢ ({𝑤 ∈ (ClWWalks‘𝐺) ∣ (♯‘𝑤) = 𝑁} = ∅ ↔ ∀𝑤 ∈ (ClWWalks‘𝐺) ¬ (♯‘𝑤) = 𝑁)
27	24, 25, 26	3imtr4i 291	. . 3 ⊢ (¬ (𝑁 ∈ ℕ0 ∧ 𝐺 ∈ V) → {𝑤 ∈ (ClWWalks‘𝐺) ∣ (♯‘𝑤) = 𝑁} = ∅)
28	10, 27	eqtr4d 2781	. 2 ⊢ (¬ (𝑁 ∈ ℕ0 ∧ 𝐺 ∈ V) → (𝑁 ClWWalksN 𝐺) = {𝑤 ∈ (ClWWalks‘𝐺) ∣ (♯‘𝑤) = 𝑁})
29	9, 28	pm2.61i 182	1 ⊢ (𝑁 ClWWalksN 𝐺) = {𝑤 ∈ (ClWWalks‘𝐺) ∣ (♯‘𝑤) = 𝑁}

Syntax hints:  ¬ wn 3   ↔ wb 205   ∧ wa 395   ∨ wo 843   = wceq 1539   ∈ wcel 2108   ≠ wne 2942  ∀wral 3063  {crab 3067  Vcvv 3422  ∅c0 4253  ‘cfv 6418  (class class class)co 7255  ℕ₀cn0 12163  ♯chash 13972  Word cword 14145  Vtxcvtx 27269  ClWWalkscclwwlk 28246   ClWWalksN cclwwlkn 28289

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1799  ax-4 1813  ax-5 1914  ax-6 1972  ax-7 2012  ax-8 2110  ax-9 2118  ax-10 2139  ax-11 2156  ax-12 2173  ax-ext 2709  ax-rep 5205  ax-sep 5218  ax-nul 5225  ax-pow 5283  ax-pr 5347  ax-un 7566  ax-cnex 10858  ax-resscn 10859  ax-1cn 10860  ax-icn 10861  ax-addcl 10862  ax-addrcl 10863  ax-mulcl 10864  ax-mulrcl 10865  ax-mulcom 10866  ax-addass 10867  ax-mulass 10868  ax-distr 10869  ax-i2m1 10870  ax-1ne0 10871  ax-1rid 10872  ax-rnegex 10873  ax-rrecex 10874  ax-cnre 10875  ax-pre-lttri 10876  ax-pre-lttrn 10877  ax-pre-ltadd 10878  ax-pre-mulgt0 10879

This theorem depends on definitions:  df-bi 206  df-an 396  df-or 844  df-3or 1086  df-3an 1087  df-tru 1542  df-fal 1552  df-ex 1784  df-nf 1788  df-sb 2069  df-mo 2540  df-eu 2569  df-clab 2716  df-cleq 2730  df-clel 2817  df-nfc 2888  df-ne 2943  df-nel 3049  df-ral 3068  df-rex 3069  df-reu 3070  df-rab 3072  df-v 3424  df-sbc 3712  df-csb 3829  df-dif 3886  df-un 3888  df-in 3890  df-ss 3900  df-pss 3902  df-nul 4254  df-if 4457  df-pw 4532  df-sn 4559  df-pr 4561  df-tp 4563  df-op 4565  df-uni 4837  df-int 4877  df-iun 4923  df-br 5071  df-opab 5133  df-mpt 5154  df-tr 5188  df-id 5480  df-eprel 5486  df-po 5494  df-so 5495  df-fr 5535  df-we 5537  df-xp 5586  df-rel 5587  df-cnv 5588  df-co 5589  df-dm 5590  df-rn 5591  df-res 5592  df-ima 5593  df-pred 6191  df-ord 6254  df-on 6255  df-lim 6256  df-suc 6257  df-iota 6376  df-fun 6420  df-fn 6421  df-f 6422  df-f1 6423  df-fo 6424  df-f1o 6425  df-fv 6426  df-riota 7212  df-ov 7258  df-oprab 7259  df-mpo 7260  df-om 7688  df-1st 7804  df-2nd 7805  df-frecs 8068  df-wrecs 8099  df-recs 8173  df-rdg 8212  df-1o 8267  df-er 8456  df-map 8575  df-en 8692  df-dom 8693  df-sdom 8694  df-fin 8695  df-card 9628  df-pnf 10942  df-mnf 10943  df-xr 10944  df-ltxr 10945  df-le 10946  df-sub 11137  df-neg 11138  df-nn 11904  df-n0 12164  df-z 12250  df-uz 12512  df-fz 13169  df-fzo 13312  df-hash 13973  df-word 14146  df-clwwlk 28247  df-clwwlkn 28290

This theorem is referenced by:  isclwwlkn  28292  clwwlkn0  28293  clwwlknfi  28310  clwlknf1oclwwlkn  28349