Theorem clwwlkn 27804

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 6670	. . . . 5 ⊢ (𝑔 = 𝐺 → (ClWWalks‘𝑔) = (ClWWalks‘𝐺))
2	1	adantl 484	. . . 4 ⊢ ((𝑛 = 𝑁 ∧ 𝑔 = 𝐺) → (ClWWalks‘𝑔) = (ClWWalks‘𝐺))
3		eqeq2 2833	. . . . 5 ⊢ (𝑛 = 𝑁 → ((♯‘𝑤) = 𝑛 ↔ (♯‘𝑤) = 𝑁))
4	3	adantr 483	. . . 4 ⊢ ((𝑛 = 𝑁 ∧ 𝑔 = 𝐺) → ((♯‘𝑤) = 𝑛 ↔ (♯‘𝑤) = 𝑁))
5	2, 4	rabeqbidv 3485	. . 3 ⊢ ((𝑛 = 𝑁 ∧ 𝑔 = 𝐺) → {𝑤 ∈ (ClWWalks‘𝑔) ∣ (♯‘𝑤) = 𝑛} = {𝑤 ∈ (ClWWalks‘𝐺) ∣ (♯‘𝑤) = 𝑁})
6		df-clwwlkn 27803	. . 3 ⊢ ClWWalksN = (𝑛 ∈ ℕ0, 𝑔 ∈ V ↦ {𝑤 ∈ (ClWWalks‘𝑔) ∣ (♯‘𝑤) = 𝑛})
7		fvex 6683	. . . 4 ⊢ (ClWWalks‘𝐺) ∈ V
8	7	rabex 5235	. . 3 ⊢ {𝑤 ∈ (ClWWalks‘𝐺) ∣ (♯‘𝑤) = 𝑁} ∈ V
9	5, 6, 8	ovmpoa 7305	. 2 ⊢ ((𝑁 ∈ ℕ0 ∧ 𝐺 ∈ V) → (𝑁 ClWWalksN 𝐺) = {𝑤 ∈ (ClWWalks‘𝐺) ∣ (♯‘𝑤) = 𝑁})
10	6	mpondm0 7386	. . 3 ⊢ (¬ (𝑁 ∈ ℕ0 ∧ 𝐺 ∈ V) → (𝑁 ClWWalksN 𝐺) = ∅)
11		eqid 2821	. . . . . . . . . . 11 ⊢ (Vtx‘𝐺) = (Vtx‘𝐺)
12	11	clwwlkbp 27763	. . . . . . . . . 10 ⊢ (𝑤 ∈ (ClWWalks‘𝐺) → (𝐺 ∈ V ∧ 𝑤 ∈ Word (Vtx‘𝐺) ∧ 𝑤 ≠ ∅))
13	12	simp2d 1139	. . . . . . . . 9 ⊢ (𝑤 ∈ (ClWWalks‘𝐺) → 𝑤 ∈ Word (Vtx‘𝐺))
14		lencl 13883	. . . . . . . . 9 ⊢ (𝑤 ∈ Word (Vtx‘𝐺) → (♯‘𝑤) ∈ ℕ0)
15	13, 14	syl 17	. . . . . . . 8 ⊢ (𝑤 ∈ (ClWWalks‘𝐺) → (♯‘𝑤) ∈ ℕ0)
16		eleq1 2900	. . . . . . . 8 ⊢ ((♯‘𝑤) = 𝑁 → ((♯‘𝑤) ∈ ℕ0 ↔ 𝑁 ∈ ℕ0))
17	15, 16	syl5ibcom 247	. . . . . . 7 ⊢ (𝑤 ∈ (ClWWalks‘𝐺) → ((♯‘𝑤) = 𝑁 → 𝑁 ∈ ℕ0))
18	17	con3rr3 158	. . . . . 6 ⊢ (¬ 𝑁 ∈ ℕ0 → (𝑤 ∈ (ClWWalks‘𝐺) → ¬ (♯‘𝑤) = 𝑁))
19	18	ralrimiv 3181	. . . . 5 ⊢ (¬ 𝑁 ∈ ℕ0 → ∀𝑤 ∈ (ClWWalks‘𝐺) ¬ (♯‘𝑤) = 𝑁)
20		ral0 4456	. . . . . 6 ⊢ ∀𝑤 ∈ ∅ ¬ (♯‘𝑤) = 𝑁
21		fvprc 6663	. . . . . . 7 ⊢ (¬ 𝐺 ∈ V → (ClWWalks‘𝐺) = ∅)
22	21	raleqdv 3415	. . . . . 6 ⊢ (¬ 𝐺 ∈ V → (∀𝑤 ∈ (ClWWalks‘𝐺) ¬ (♯‘𝑤) = 𝑁 ↔ ∀𝑤 ∈ ∅ ¬ (♯‘𝑤) = 𝑁))
23	20, 22	mpbiri 260	. . . . 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 4338	. . . 4 ⊢ ({𝑤 ∈ (ClWWalks‘𝐺) ∣ (♯‘𝑤) = 𝑁} = ∅ ↔ ∀𝑤 ∈ (ClWWalks‘𝐺) ¬ (♯‘𝑤) = 𝑁)
27	24, 25, 26	3imtr4i 294	. . 3 ⊢ (¬ (𝑁 ∈ ℕ0 ∧ 𝐺 ∈ V) → {𝑤 ∈ (ClWWalks‘𝐺) ∣ (♯‘𝑤) = 𝑁} = ∅)
28	10, 27	eqtr4d 2859	. 2 ⊢ (¬ (𝑁 ∈ ℕ0 ∧ 𝐺 ∈ V) → (𝑁 ClWWalksN 𝐺) = {𝑤 ∈ (ClWWalks‘𝐺) ∣ (♯‘𝑤) = 𝑁})
29	9, 28	pm2.61i 184	1 ⊢ (𝑁 ClWWalksN 𝐺) = {𝑤 ∈ (ClWWalks‘𝐺) ∣ (♯‘𝑤) = 𝑁}

Syntax hints:  ¬ wn 3   ↔ wb 208   ∧ wa 398   ∨ wo 843   = wceq 1537   ∈ wcel 2114   ≠ wne 3016  ∀wral 3138  {crab 3142  Vcvv 3494  ∅c0 4291  ‘cfv 6355  (class class class)co 7156  ℕ₀cn0 11898  ♯chash 13691  Word cword 13862  Vtxcvtx 26781  ClWWalkscclwwlk 27759   ClWWalksN cclwwlkn 27802

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1796  ax-4 1810  ax-5 1911  ax-6 1970  ax-7 2015  ax-8 2116  ax-9 2124  ax-10 2145  ax-11 2161  ax-12 2177  ax-ext 2793  ax-rep 5190  ax-sep 5203  ax-nul 5210  ax-pow 5266  ax-pr 5330  ax-un 7461  ax-cnex 10593  ax-resscn 10594  ax-1cn 10595  ax-icn 10596  ax-addcl 10597  ax-addrcl 10598  ax-mulcl 10599  ax-mulrcl 10600  ax-mulcom 10601  ax-addass 10602  ax-mulass 10603  ax-distr 10604  ax-i2m1 10605  ax-1ne0 10606  ax-1rid 10607  ax-rnegex 10608  ax-rrecex 10609  ax-cnre 10610  ax-pre-lttri 10611  ax-pre-lttrn 10612  ax-pre-ltadd 10613  ax-pre-mulgt0 10614

This theorem depends on definitions:  df-bi 209  df-an 399  df-or 844  df-3or 1084  df-3an 1085  df-tru 1540  df-ex 1781  df-nf 1785  df-sb 2070  df-mo 2622  df-eu 2654  df-clab 2800  df-cleq 2814  df-clel 2893  df-nfc 2963  df-ne 3017  df-nel 3124  df-ral 3143  df-rex 3144  df-reu 3145  df-rab 3147  df-v 3496  df-sbc 3773  df-csb 3884  df-dif 3939  df-un 3941  df-in 3943  df-ss 3952  df-pss 3954  df-nul 4292  df-if 4468  df-pw 4541  df-sn 4568  df-pr 4570  df-tp 4572  df-op 4574  df-uni 4839  df-int 4877  df-iun 4921  df-br 5067  df-opab 5129  df-mpt 5147  df-tr 5173  df-id 5460  df-eprel 5465  df-po 5474  df-so 5475  df-fr 5514  df-we 5516  df-xp 5561  df-rel 5562  df-cnv 5563  df-co 5564  df-dm 5565  df-rn 5566  df-res 5567  df-ima 5568  df-pred 6148  df-ord 6194  df-on 6195  df-lim 6196  df-suc 6197  df-iota 6314  df-fun 6357  df-fn 6358  df-f 6359  df-f1 6360  df-fo 6361  df-f1o 6362  df-fv 6363  df-riota 7114  df-ov 7159  df-oprab 7160  df-mpo 7161  df-om 7581  df-1st 7689  df-2nd 7690  df-wrecs 7947  df-recs 8008  df-rdg 8046  df-1o 8102  df-oadd 8106  df-er 8289  df-map 8408  df-en 8510  df-dom 8511  df-sdom 8512  df-fin 8513  df-card 9368  df-pnf 10677  df-mnf 10678  df-xr 10679  df-ltxr 10680  df-le 10681  df-sub 10872  df-neg 10873  df-nn 11639  df-n0 11899  df-z 11983  df-uz 12245  df-fz 12894  df-fzo 13035  df-hash 13692  df-word 13863  df-clwwlk 27760  df-clwwlkn 27803

This theorem is referenced by:  isclwwlkn  27805  clwwlkn0  27806  clwwlknfi  27823  clwwlknfiOLD  27824  clwlknf1oclwwlkn  27863