Theorem clwwlkn 29908

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 6896	. . . . 5 ⊢ (𝑔 = 𝐺 → (ClWWalks‘𝑔) = (ClWWalks‘𝐺))
2	1	adantl 480	. . . 4 ⊢ ((𝑛 = 𝑁 ∧ 𝑔 = 𝐺) → (ClWWalks‘𝑔) = (ClWWalks‘𝐺))
3		eqeq2 2737	. . . . 5 ⊢ (𝑛 = 𝑁 → ((♯‘𝑤) = 𝑛 ↔ (♯‘𝑤) = 𝑁))
4	3	adantr 479	. . . 4 ⊢ ((𝑛 = 𝑁 ∧ 𝑔 = 𝐺) → ((♯‘𝑤) = 𝑛 ↔ (♯‘𝑤) = 𝑁))
5	2, 4	rabeqbidv 3436	. . 3 ⊢ ((𝑛 = 𝑁 ∧ 𝑔 = 𝐺) → {𝑤 ∈ (ClWWalks‘𝑔) ∣ (♯‘𝑤) = 𝑛} = {𝑤 ∈ (ClWWalks‘𝐺) ∣ (♯‘𝑤) = 𝑁})
6		df-clwwlkn 29907	. . 3 ⊢ ClWWalksN = (𝑛 ∈ ℕ0, 𝑔 ∈ V ↦ {𝑤 ∈ (ClWWalks‘𝑔) ∣ (♯‘𝑤) = 𝑛})
7		fvex 6909	. . . 4 ⊢ (ClWWalks‘𝐺) ∈ V
8	7	rabex 5335	. . 3 ⊢ {𝑤 ∈ (ClWWalks‘𝐺) ∣ (♯‘𝑤) = 𝑁} ∈ V
9	5, 6, 8	ovmpoa 7576	. 2 ⊢ ((𝑁 ∈ ℕ0 ∧ 𝐺 ∈ V) → (𝑁 ClWWalksN 𝐺) = {𝑤 ∈ (ClWWalks‘𝐺) ∣ (♯‘𝑤) = 𝑁})
10	6	mpondm0 7661	. . 3 ⊢ (¬ (𝑁 ∈ ℕ0 ∧ 𝐺 ∈ V) → (𝑁 ClWWalksN 𝐺) = ∅)
11		eqid 2725	. . . . . . . . . . 11 ⊢ (Vtx‘𝐺) = (Vtx‘𝐺)
12	11	clwwlkbp 29867	. . . . . . . . . 10 ⊢ (𝑤 ∈ (ClWWalks‘𝐺) → (𝐺 ∈ V ∧ 𝑤 ∈ Word (Vtx‘𝐺) ∧ 𝑤 ≠ ∅))
13	12	simp2d 1140	. . . . . . . . 9 ⊢ (𝑤 ∈ (ClWWalks‘𝐺) → 𝑤 ∈ Word (Vtx‘𝐺))
14		lencl 14519	. . . . . . . . 9 ⊢ (𝑤 ∈ Word (Vtx‘𝐺) → (♯‘𝑤) ∈ ℕ0)
15	13, 14	syl 17	. . . . . . . 8 ⊢ (𝑤 ∈ (ClWWalks‘𝐺) → (♯‘𝑤) ∈ ℕ0)
16		eleq1 2813	. . . . . . . 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 3134	. . . . 5 ⊢ (¬ 𝑁 ∈ ℕ0 → ∀𝑤 ∈ (ClWWalks‘𝐺) ¬ (♯‘𝑤) = 𝑁)
20		ral0 4514	. . . . . 6 ⊢ ∀𝑤 ∈ ∅ ¬ (♯‘𝑤) = 𝑁
21		fvprc 6888	. . . . . . 7 ⊢ (¬ 𝐺 ∈ V → (ClWWalks‘𝐺) = ∅)
22	21	raleqdv 3314	. . . . . 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 855	. . . 4 ⊢ ((¬ 𝑁 ∈ ℕ0 ∨ ¬ 𝐺 ∈ V) → ∀𝑤 ∈ (ClWWalks‘𝐺) ¬ (♯‘𝑤) = 𝑁)
25		ianor 979	. . . 4 ⊢ (¬ (𝑁 ∈ ℕ0 ∧ 𝐺 ∈ V) ↔ (¬ 𝑁 ∈ ℕ0 ∨ ¬ 𝐺 ∈ V))
26		rabeq0 4386	. . . 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 2768	. 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 394   ∨ wo 845   = wceq 1533   ∈ wcel 2098   ≠ wne 2929  ∀wral 3050  {crab 3418  Vcvv 3461  ∅c0 4322  ‘cfv 6549  (class class class)co 7419  ℕ₀cn0 12505  ♯chash 14325  Word cword 14500  Vtxcvtx 28881  ClWWalkscclwwlk 29863   ClWWalksN cclwwlkn 29906

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 5286  ax-sep 5300  ax-nul 5307  ax-pow 5365  ax-pr 5429  ax-un 7741  ax-cnex 11196  ax-resscn 11197  ax-1cn 11198  ax-icn 11199  ax-addcl 11200  ax-addrcl 11201  ax-mulcl 11202  ax-mulrcl 11203  ax-mulcom 11204  ax-addass 11205  ax-mulass 11206  ax-distr 11207  ax-i2m1 11208  ax-1ne0 11209  ax-1rid 11210  ax-rnegex 11211  ax-rrecex 11212  ax-cnre 11213  ax-pre-lttri 11214  ax-pre-lttrn 11215  ax-pre-ltadd 11216  ax-pre-mulgt0 11217

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 2930  df-nel 3036  df-ral 3051  df-rex 3060  df-reu 3364  df-rab 3419  df-v 3463  df-sbc 3774  df-csb 3890  df-dif 3947  df-un 3949  df-in 3951  df-ss 3961  df-pss 3964  df-nul 4323  df-if 4531  df-pw 4606  df-sn 4631  df-pr 4633  df-op 4637  df-uni 4910  df-int 4951  df-iun 4999  df-br 5150  df-opab 5212  df-mpt 5233  df-tr 5267  df-id 5576  df-eprel 5582  df-po 5590  df-so 5591  df-fr 5633  df-we 5635  df-xp 5684  df-rel 5685  df-cnv 5686  df-co 5687  df-dm 5688  df-rn 5689  df-res 5690  df-ima 5691  df-pred 6307  df-ord 6374  df-on 6375  df-lim 6376  df-suc 6377  df-iota 6501  df-fun 6551  df-fn 6552  df-f 6553  df-f1 6554  df-fo 6555  df-f1o 6556  df-fv 6557  df-riota 7375  df-ov 7422  df-oprab 7423  df-mpo 7424  df-om 7872  df-1st 7994  df-2nd 7995  df-frecs 8287  df-wrecs 8318  df-recs 8392  df-rdg 8431  df-1o 8487  df-er 8725  df-map 8847  df-en 8965  df-dom 8966  df-sdom 8967  df-fin 8968  df-card 9964  df-pnf 11282  df-mnf 11283  df-xr 11284  df-ltxr 11285  df-le 11286  df-sub 11478  df-neg 11479  df-nn 12246  df-n0 12506  df-z 12592  df-uz 12856  df-fz 13520  df-fzo 13663  df-hash 14326  df-word 14501  df-clwwlk 29864  df-clwwlkn 29907

This theorem is referenced by:  isclwwlkn  29909  clwwlkn0  29910  clwwlknfi  29927  clwlknf1oclwwlkn  29966