Theorem clwwlkn 30058

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 6920	. . . . 5 ⊢ (𝑔 = 𝐺 → (ClWWalks‘𝑔) = (ClWWalks‘𝐺))
2	1	adantl 481	. . . 4 ⊢ ((𝑛 = 𝑁 ∧ 𝑔 = 𝐺) → (ClWWalks‘𝑔) = (ClWWalks‘𝐺))
3		eqeq2 2752	. . . . 5 ⊢ (𝑛 = 𝑁 → ((♯‘𝑤) = 𝑛 ↔ (♯‘𝑤) = 𝑁))
4	3	adantr 480	. . . 4 ⊢ ((𝑛 = 𝑁 ∧ 𝑔 = 𝐺) → ((♯‘𝑤) = 𝑛 ↔ (♯‘𝑤) = 𝑁))
5	2, 4	rabeqbidv 3462	. . 3 ⊢ ((𝑛 = 𝑁 ∧ 𝑔 = 𝐺) → {𝑤 ∈ (ClWWalks‘𝑔) ∣ (♯‘𝑤) = 𝑛} = {𝑤 ∈ (ClWWalks‘𝐺) ∣ (♯‘𝑤) = 𝑁})
6		df-clwwlkn 30057	. . 3 ⊢ ClWWalksN = (𝑛 ∈ ℕ0, 𝑔 ∈ V ↦ {𝑤 ∈ (ClWWalks‘𝑔) ∣ (♯‘𝑤) = 𝑛})
7		fvex 6933	. . . 4 ⊢ (ClWWalks‘𝐺) ∈ V
8	7	rabex 5357	. . 3 ⊢ {𝑤 ∈ (ClWWalks‘𝐺) ∣ (♯‘𝑤) = 𝑁} ∈ V
9	5, 6, 8	ovmpoa 7605	. 2 ⊢ ((𝑁 ∈ ℕ0 ∧ 𝐺 ∈ V) → (𝑁 ClWWalksN 𝐺) = {𝑤 ∈ (ClWWalks‘𝐺) ∣ (♯‘𝑤) = 𝑁})
10	6	mpondm0 7690	. . 3 ⊢ (¬ (𝑁 ∈ ℕ0 ∧ 𝐺 ∈ V) → (𝑁 ClWWalksN 𝐺) = ∅)
11		eqid 2740	. . . . . . . . . . 11 ⊢ (Vtx‘𝐺) = (Vtx‘𝐺)
12	11	clwwlkbp 30017	. . . . . . . . . 10 ⊢ (𝑤 ∈ (ClWWalks‘𝐺) → (𝐺 ∈ V ∧ 𝑤 ∈ Word (Vtx‘𝐺) ∧ 𝑤 ≠ ∅))
13	12	simp2d 1143	. . . . . . . . 9 ⊢ (𝑤 ∈ (ClWWalks‘𝐺) → 𝑤 ∈ Word (Vtx‘𝐺))
14		lencl 14581	. . . . . . . . 9 ⊢ (𝑤 ∈ Word (Vtx‘𝐺) → (♯‘𝑤) ∈ ℕ0)
15	13, 14	syl 17	. . . . . . . 8 ⊢ (𝑤 ∈ (ClWWalks‘𝐺) → (♯‘𝑤) ∈ ℕ0)
16		eleq1 2832	. . . . . . . 8 ⊢ ((♯‘𝑤) = 𝑁 → ((♯‘𝑤) ∈ ℕ0 ↔ 𝑁 ∈ ℕ0))
17	15, 16	syl5ibcom 245	. . . . . . 7 ⊢ (𝑤 ∈ (ClWWalks‘𝐺) → ((♯‘𝑤) = 𝑁 → 𝑁 ∈ ℕ0))
18	17	con3rr3 155	. . . . . 6 ⊢ (¬ 𝑁 ∈ ℕ0 → (𝑤 ∈ (ClWWalks‘𝐺) → ¬ (♯‘𝑤) = 𝑁))
19	18	ralrimiv 3151	. . . . 5 ⊢ (¬ 𝑁 ∈ ℕ0 → ∀𝑤 ∈ (ClWWalks‘𝐺) ¬ (♯‘𝑤) = 𝑁)
20		ral0 4536	. . . . . 6 ⊢ ∀𝑤 ∈ ∅ ¬ (♯‘𝑤) = 𝑁
21		fvprc 6912	. . . . . . 7 ⊢ (¬ 𝐺 ∈ V → (ClWWalks‘𝐺) = ∅)
22	21	raleqdv 3334	. . . . . 6 ⊢ (¬ 𝐺 ∈ V → (∀𝑤 ∈ (ClWWalks‘𝐺) ¬ (♯‘𝑤) = 𝑁 ↔ ∀𝑤 ∈ ∅ ¬ (♯‘𝑤) = 𝑁))
23	20, 22	mpbiri 258	. . . . 5 ⊢ (¬ 𝐺 ∈ V → ∀𝑤 ∈ (ClWWalks‘𝐺) ¬ (♯‘𝑤) = 𝑁)
24	19, 23	jaoi 856	. . . 4 ⊢ ((¬ 𝑁 ∈ ℕ0 ∨ ¬ 𝐺 ∈ V) → ∀𝑤 ∈ (ClWWalks‘𝐺) ¬ (♯‘𝑤) = 𝑁)
25		ianor 982	. . . 4 ⊢ (¬ (𝑁 ∈ ℕ0 ∧ 𝐺 ∈ V) ↔ (¬ 𝑁 ∈ ℕ0 ∨ ¬ 𝐺 ∈ V))
26		rabeq0 4411	. . . 4 ⊢ ({𝑤 ∈ (ClWWalks‘𝐺) ∣ (♯‘𝑤) = 𝑁} = ∅ ↔ ∀𝑤 ∈ (ClWWalks‘𝐺) ¬ (♯‘𝑤) = 𝑁)
27	24, 25, 26	3imtr4i 292	. . 3 ⊢ (¬ (𝑁 ∈ ℕ0 ∧ 𝐺 ∈ V) → {𝑤 ∈ (ClWWalks‘𝐺) ∣ (♯‘𝑤) = 𝑁} = ∅)
28	10, 27	eqtr4d 2783	. 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 206   ∧ wa 395   ∨ wo 846   = wceq 1537   ∈ wcel 2108   ≠ wne 2946  ∀wral 3067  {crab 3443  Vcvv 3488  ∅c0 4352  ‘cfv 6573  (class class class)co 7448  ℕ₀cn0 12553  ♯chash 14379  Word cword 14562  Vtxcvtx 29031  ClWWalkscclwwlk 30013   ClWWalksN cclwwlkn 30056

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1793  ax-4 1807  ax-5 1909  ax-6 1967  ax-7 2007  ax-8 2110  ax-9 2118  ax-10 2141  ax-11 2158  ax-12 2178  ax-ext 2711  ax-rep 5303  ax-sep 5317  ax-nul 5324  ax-pow 5383  ax-pr 5447  ax-un 7770  ax-cnex 11240  ax-resscn 11241  ax-1cn 11242  ax-icn 11243  ax-addcl 11244  ax-addrcl 11245  ax-mulcl 11246  ax-mulrcl 11247  ax-mulcom 11248  ax-addass 11249  ax-mulass 11250  ax-distr 11251  ax-i2m1 11252  ax-1ne0 11253  ax-1rid 11254  ax-rnegex 11255  ax-rrecex 11256  ax-cnre 11257  ax-pre-lttri 11258  ax-pre-lttrn 11259  ax-pre-ltadd 11260  ax-pre-mulgt0 11261

This theorem depends on definitions:  df-bi 207  df-an 396  df-or 847  df-3or 1088  df-3an 1089  df-tru 1540  df-fal 1550  df-ex 1778  df-nf 1782  df-sb 2065  df-mo 2543  df-eu 2572  df-clab 2718  df-cleq 2732  df-clel 2819  df-nfc 2895  df-ne 2947  df-nel 3053  df-ral 3068  df-rex 3077  df-reu 3389  df-rab 3444  df-v 3490  df-sbc 3805  df-csb 3922  df-dif 3979  df-un 3981  df-in 3983  df-ss 3993  df-pss 3996  df-nul 4353  df-if 4549  df-pw 4624  df-sn 4649  df-pr 4651  df-op 4655  df-uni 4932  df-int 4971  df-iun 5017  df-br 5167  df-opab 5229  df-mpt 5250  df-tr 5284  df-id 5593  df-eprel 5599  df-po 5607  df-so 5608  df-fr 5652  df-we 5654  df-xp 5706  df-rel 5707  df-cnv 5708  df-co 5709  df-dm 5710  df-rn 5711  df-res 5712  df-ima 5713  df-pred 6332  df-ord 6398  df-on 6399  df-lim 6400  df-suc 6401  df-iota 6525  df-fun 6575  df-fn 6576  df-f 6577  df-f1 6578  df-fo 6579  df-f1o 6580  df-fv 6581  df-riota 7404  df-ov 7451  df-oprab 7452  df-mpo 7453  df-om 7904  df-1st 8030  df-2nd 8031  df-frecs 8322  df-wrecs 8353  df-recs 8427  df-rdg 8466  df-1o 8522  df-er 8763  df-map 8886  df-en 9004  df-dom 9005  df-sdom 9006  df-fin 9007  df-card 10008  df-pnf 11326  df-mnf 11327  df-xr 11328  df-ltxr 11329  df-le 11330  df-sub 11522  df-neg 11523  df-nn 12294  df-n0 12554  df-z 12640  df-uz 12904  df-fz 13568  df-fzo 13712  df-hash 14380  df-word 14563  df-clwwlk 30014  df-clwwlkn 30057

This theorem is referenced by:  isclwwlkn  30059  clwwlkn0  30060  clwwlknfi  30077  clwlknf1oclwwlkn  30116