Mathbox for Alexander van der Vekens < Previous   Next > Nearby theorems Mirrors  >  Home  >  MPE Home  >  Th. List  >   Mathboxes  >  lfgrwlkprop Structured version   Visualization version   GIF version

Theorem lfgrwlkprop 40896
 Description: Two adjacent vertices in a 1-walk are different in a loop-free graph. (Contributed by AV, 28-Jan-2021.)
Hypothesis
Ref Expression
lfgrwlkprop.i 𝐼 = (iEdg‘𝐺)
Assertion
Ref Expression
lfgrwlkprop ((𝐹(1Walks‘𝐺)𝑃𝐼:dom 𝐼⟶{𝑥 ∈ 𝒫 𝑉 ∣ 2 ≤ (#‘𝑥)}) → ∀𝑘 ∈ (0..^(#‘𝐹))(𝑃𝑘) ≠ (𝑃‘(𝑘 + 1)))
Distinct variable groups:   𝑘,𝐹,𝑥   𝑘,𝐺   𝑘,𝐼,𝑥   𝑃,𝑘   𝑘,𝑉,𝑥
Allowed substitution hints:   𝑃(𝑥)   𝐺(𝑥)

Proof of Theorem lfgrwlkprop
StepHypRef Expression
1 wlkv 40815 . . . . 5 (𝐹(1Walks‘𝐺)𝑃 → (𝐺 ∈ V ∧ 𝐹 ∈ V ∧ 𝑃 ∈ V))
2 eqid 2610 . . . . . 6 (Vtx‘𝐺) = (Vtx‘𝐺)
3 lfgrwlkprop.i . . . . . 6 𝐼 = (iEdg‘𝐺)
42, 3is1wlk 40813 . . . . 5 ((𝐺 ∈ V ∧ 𝐹 ∈ V ∧ 𝑃 ∈ V) → (𝐹(1Walks‘𝐺)𝑃 ↔ (𝐹 ∈ Word dom 𝐼𝑃:(0...(#‘𝐹))⟶(Vtx‘𝐺) ∧ ∀𝑘 ∈ (0..^(#‘𝐹))if-((𝑃𝑘) = (𝑃‘(𝑘 + 1)), (𝐼‘(𝐹𝑘)) = {(𝑃𝑘)}, {(𝑃𝑘), (𝑃‘(𝑘 + 1))} ⊆ (𝐼‘(𝐹𝑘))))))
51, 4syl 17 . . . 4 (𝐹(1Walks‘𝐺)𝑃 → (𝐹(1Walks‘𝐺)𝑃 ↔ (𝐹 ∈ Word dom 𝐼𝑃:(0...(#‘𝐹))⟶(Vtx‘𝐺) ∧ ∀𝑘 ∈ (0..^(#‘𝐹))if-((𝑃𝑘) = (𝑃‘(𝑘 + 1)), (𝐼‘(𝐹𝑘)) = {(𝑃𝑘)}, {(𝑃𝑘), (𝑃‘(𝑘 + 1))} ⊆ (𝐼‘(𝐹𝑘))))))
6 ifptru 1017 . . . . . . . . . . . 12 ((𝑃𝑘) = (𝑃‘(𝑘 + 1)) → (if-((𝑃𝑘) = (𝑃‘(𝑘 + 1)), (𝐼‘(𝐹𝑘)) = {(𝑃𝑘)}, {(𝑃𝑘), (𝑃‘(𝑘 + 1))} ⊆ (𝐼‘(𝐹𝑘))) ↔ (𝐼‘(𝐹𝑘)) = {(𝑃𝑘)}))
76adantr 480 . . . . . . . . . . 11 (((𝑃𝑘) = (𝑃‘(𝑘 + 1)) ∧ (((𝐹 ∈ Word dom 𝐼𝑃:(0...(#‘𝐹))⟶(Vtx‘𝐺)) ∧ 𝐼:dom 𝐼⟶{𝑥 ∈ 𝒫 𝑉 ∣ 2 ≤ (#‘𝑥)}) ∧ 𝑘 ∈ (0..^(#‘𝐹)))) → (if-((𝑃𝑘) = (𝑃‘(𝑘 + 1)), (𝐼‘(𝐹𝑘)) = {(𝑃𝑘)}, {(𝑃𝑘), (𝑃‘(𝑘 + 1))} ⊆ (𝐼‘(𝐹𝑘))) ↔ (𝐼‘(𝐹𝑘)) = {(𝑃𝑘)}))
8 simplr 788 . . . . . . . . . . . . . 14 ((((𝐹 ∈ Word dom 𝐼𝑃:(0...(#‘𝐹))⟶(Vtx‘𝐺)) ∧ 𝐼:dom 𝐼⟶{𝑥 ∈ 𝒫 𝑉 ∣ 2 ≤ (#‘𝑥)}) ∧ 𝑘 ∈ (0..^(#‘𝐹))) → 𝐼:dom 𝐼⟶{𝑥 ∈ 𝒫 𝑉 ∣ 2 ≤ (#‘𝑥)})
9 wrdsymbcl 13173 . . . . . . . . . . . . . . 15 ((𝐹 ∈ Word dom 𝐼𝑘 ∈ (0..^(#‘𝐹))) → (𝐹𝑘) ∈ dom 𝐼)
109ad4ant14 1285 . . . . . . . . . . . . . 14 ((((𝐹 ∈ Word dom 𝐼𝑃:(0...(#‘𝐹))⟶(Vtx‘𝐺)) ∧ 𝐼:dom 𝐼⟶{𝑥 ∈ 𝒫 𝑉 ∣ 2 ≤ (#‘𝑥)}) ∧ 𝑘 ∈ (0..^(#‘𝐹))) → (𝐹𝑘) ∈ dom 𝐼)
118, 10ffvelrnd 6268 . . . . . . . . . . . . 13 ((((𝐹 ∈ Word dom 𝐼𝑃:(0...(#‘𝐹))⟶(Vtx‘𝐺)) ∧ 𝐼:dom 𝐼⟶{𝑥 ∈ 𝒫 𝑉 ∣ 2 ≤ (#‘𝑥)}) ∧ 𝑘 ∈ (0..^(#‘𝐹))) → (𝐼‘(𝐹𝑘)) ∈ {𝑥 ∈ 𝒫 𝑉 ∣ 2 ≤ (#‘𝑥)})
12 fveq2 6103 . . . . . . . . . . . . . . . 16 (𝑥 = (𝐼‘(𝐹𝑘)) → (#‘𝑥) = (#‘(𝐼‘(𝐹𝑘))))
1312breq2d 4595 . . . . . . . . . . . . . . 15 (𝑥 = (𝐼‘(𝐹𝑘)) → (2 ≤ (#‘𝑥) ↔ 2 ≤ (#‘(𝐼‘(𝐹𝑘)))))
1413elrab 3331 . . . . . . . . . . . . . 14 ((𝐼‘(𝐹𝑘)) ∈ {𝑥 ∈ 𝒫 𝑉 ∣ 2 ≤ (#‘𝑥)} ↔ ((𝐼‘(𝐹𝑘)) ∈ 𝒫 𝑉 ∧ 2 ≤ (#‘(𝐼‘(𝐹𝑘)))))
15 fveq2 6103 . . . . . . . . . . . . . . . . . . 19 ((𝐼‘(𝐹𝑘)) = {(𝑃𝑘)} → (#‘(𝐼‘(𝐹𝑘))) = (#‘{(𝑃𝑘)}))
1615breq2d 4595 . . . . . . . . . . . . . . . . . 18 ((𝐼‘(𝐹𝑘)) = {(𝑃𝑘)} → (2 ≤ (#‘(𝐼‘(𝐹𝑘))) ↔ 2 ≤ (#‘{(𝑃𝑘)})))
17 fvex 6113 . . . . . . . . . . . . . . . . . . . . 21 (𝑃𝑘) ∈ V
18 hashsng 13020 . . . . . . . . . . . . . . . . . . . . 21 ((𝑃𝑘) ∈ V → (#‘{(𝑃𝑘)}) = 1)
1917, 18ax-mp 5 . . . . . . . . . . . . . . . . . . . 20 (#‘{(𝑃𝑘)}) = 1
2019breq2i 4591 . . . . . . . . . . . . . . . . . . 19 (2 ≤ (#‘{(𝑃𝑘)}) ↔ 2 ≤ 1)
21 1lt2 11071 . . . . . . . . . . . . . . . . . . . 20 1 < 2
22 1re 9918 . . . . . . . . . . . . . . . . . . . . . 22 1 ∈ ℝ
23 2re 10967 . . . . . . . . . . . . . . . . . . . . . 22 2 ∈ ℝ
2422, 23ltnlei 10037 . . . . . . . . . . . . . . . . . . . . 21 (1 < 2 ↔ ¬ 2 ≤ 1)
25 pm2.21 119 . . . . . . . . . . . . . . . . . . . . 21 (¬ 2 ≤ 1 → (2 ≤ 1 → (𝑃𝑘) ≠ (𝑃‘(𝑘 + 1))))
2624, 25sylbi 206 . . . . . . . . . . . . . . . . . . . 20 (1 < 2 → (2 ≤ 1 → (𝑃𝑘) ≠ (𝑃‘(𝑘 + 1))))
2721, 26ax-mp 5 . . . . . . . . . . . . . . . . . . 19 (2 ≤ 1 → (𝑃𝑘) ≠ (𝑃‘(𝑘 + 1)))
2820, 27sylbi 206 . . . . . . . . . . . . . . . . . 18 (2 ≤ (#‘{(𝑃𝑘)}) → (𝑃𝑘) ≠ (𝑃‘(𝑘 + 1)))
2916, 28syl6bi 242 . . . . . . . . . . . . . . . . 17 ((𝐼‘(𝐹𝑘)) = {(𝑃𝑘)} → (2 ≤ (#‘(𝐼‘(𝐹𝑘))) → (𝑃𝑘) ≠ (𝑃‘(𝑘 + 1))))
3029com12 32 . . . . . . . . . . . . . . . 16 (2 ≤ (#‘(𝐼‘(𝐹𝑘))) → ((𝐼‘(𝐹𝑘)) = {(𝑃𝑘)} → (𝑃𝑘) ≠ (𝑃‘(𝑘 + 1))))
3130adantl 481 . . . . . . . . . . . . . . 15 (((𝐼‘(𝐹𝑘)) ∈ 𝒫 𝑉 ∧ 2 ≤ (#‘(𝐼‘(𝐹𝑘)))) → ((𝐼‘(𝐹𝑘)) = {(𝑃𝑘)} → (𝑃𝑘) ≠ (𝑃‘(𝑘 + 1))))
3231a1i 11 . . . . . . . . . . . . . 14 ((((𝐹 ∈ Word dom 𝐼𝑃:(0...(#‘𝐹))⟶(Vtx‘𝐺)) ∧ 𝐼:dom 𝐼⟶{𝑥 ∈ 𝒫 𝑉 ∣ 2 ≤ (#‘𝑥)}) ∧ 𝑘 ∈ (0..^(#‘𝐹))) → (((𝐼‘(𝐹𝑘)) ∈ 𝒫 𝑉 ∧ 2 ≤ (#‘(𝐼‘(𝐹𝑘)))) → ((𝐼‘(𝐹𝑘)) = {(𝑃𝑘)} → (𝑃𝑘) ≠ (𝑃‘(𝑘 + 1)))))
3314, 32syl5bi 231 . . . . . . . . . . . . 13 ((((𝐹 ∈ Word dom 𝐼𝑃:(0...(#‘𝐹))⟶(Vtx‘𝐺)) ∧ 𝐼:dom 𝐼⟶{𝑥 ∈ 𝒫 𝑉 ∣ 2 ≤ (#‘𝑥)}) ∧ 𝑘 ∈ (0..^(#‘𝐹))) → ((𝐼‘(𝐹𝑘)) ∈ {𝑥 ∈ 𝒫 𝑉 ∣ 2 ≤ (#‘𝑥)} → ((𝐼‘(𝐹𝑘)) = {(𝑃𝑘)} → (𝑃𝑘) ≠ (𝑃‘(𝑘 + 1)))))
3411, 33mpd 15 . . . . . . . . . . . 12 ((((𝐹 ∈ Word dom 𝐼𝑃:(0...(#‘𝐹))⟶(Vtx‘𝐺)) ∧ 𝐼:dom 𝐼⟶{𝑥 ∈ 𝒫 𝑉 ∣ 2 ≤ (#‘𝑥)}) ∧ 𝑘 ∈ (0..^(#‘𝐹))) → ((𝐼‘(𝐹𝑘)) = {(𝑃𝑘)} → (𝑃𝑘) ≠ (𝑃‘(𝑘 + 1))))
3534adantl 481 . . . . . . . . . . 11 (((𝑃𝑘) = (𝑃‘(𝑘 + 1)) ∧ (((𝐹 ∈ Word dom 𝐼𝑃:(0...(#‘𝐹))⟶(Vtx‘𝐺)) ∧ 𝐼:dom 𝐼⟶{𝑥 ∈ 𝒫 𝑉 ∣ 2 ≤ (#‘𝑥)}) ∧ 𝑘 ∈ (0..^(#‘𝐹)))) → ((𝐼‘(𝐹𝑘)) = {(𝑃𝑘)} → (𝑃𝑘) ≠ (𝑃‘(𝑘 + 1))))
367, 35sylbid 229 . . . . . . . . . 10 (((𝑃𝑘) = (𝑃‘(𝑘 + 1)) ∧ (((𝐹 ∈ Word dom 𝐼𝑃:(0...(#‘𝐹))⟶(Vtx‘𝐺)) ∧ 𝐼:dom 𝐼⟶{𝑥 ∈ 𝒫 𝑉 ∣ 2 ≤ (#‘𝑥)}) ∧ 𝑘 ∈ (0..^(#‘𝐹)))) → (if-((𝑃𝑘) = (𝑃‘(𝑘 + 1)), (𝐼‘(𝐹𝑘)) = {(𝑃𝑘)}, {(𝑃𝑘), (𝑃‘(𝑘 + 1))} ⊆ (𝐼‘(𝐹𝑘))) → (𝑃𝑘) ≠ (𝑃‘(𝑘 + 1))))
3736ex 449 . . . . . . . . 9 ((𝑃𝑘) = (𝑃‘(𝑘 + 1)) → ((((𝐹 ∈ Word dom 𝐼𝑃:(0...(#‘𝐹))⟶(Vtx‘𝐺)) ∧ 𝐼:dom 𝐼⟶{𝑥 ∈ 𝒫 𝑉 ∣ 2 ≤ (#‘𝑥)}) ∧ 𝑘 ∈ (0..^(#‘𝐹))) → (if-((𝑃𝑘) = (𝑃‘(𝑘 + 1)), (𝐼‘(𝐹𝑘)) = {(𝑃𝑘)}, {(𝑃𝑘), (𝑃‘(𝑘 + 1))} ⊆ (𝐼‘(𝐹𝑘))) → (𝑃𝑘) ≠ (𝑃‘(𝑘 + 1)))))
38 neqne 2790 . . . . . . . . . 10 (¬ (𝑃𝑘) = (𝑃‘(𝑘 + 1)) → (𝑃𝑘) ≠ (𝑃‘(𝑘 + 1)))
39382a1d 26 . . . . . . . . 9 (¬ (𝑃𝑘) = (𝑃‘(𝑘 + 1)) → ((((𝐹 ∈ Word dom 𝐼𝑃:(0...(#‘𝐹))⟶(Vtx‘𝐺)) ∧ 𝐼:dom 𝐼⟶{𝑥 ∈ 𝒫 𝑉 ∣ 2 ≤ (#‘𝑥)}) ∧ 𝑘 ∈ (0..^(#‘𝐹))) → (if-((𝑃𝑘) = (𝑃‘(𝑘 + 1)), (𝐼‘(𝐹𝑘)) = {(𝑃𝑘)}, {(𝑃𝑘), (𝑃‘(𝑘 + 1))} ⊆ (𝐼‘(𝐹𝑘))) → (𝑃𝑘) ≠ (𝑃‘(𝑘 + 1)))))
4037, 39pm2.61i 175 . . . . . . . 8 ((((𝐹 ∈ Word dom 𝐼𝑃:(0...(#‘𝐹))⟶(Vtx‘𝐺)) ∧ 𝐼:dom 𝐼⟶{𝑥 ∈ 𝒫 𝑉 ∣ 2 ≤ (#‘𝑥)}) ∧ 𝑘 ∈ (0..^(#‘𝐹))) → (if-((𝑃𝑘) = (𝑃‘(𝑘 + 1)), (𝐼‘(𝐹𝑘)) = {(𝑃𝑘)}, {(𝑃𝑘), (𝑃‘(𝑘 + 1))} ⊆ (𝐼‘(𝐹𝑘))) → (𝑃𝑘) ≠ (𝑃‘(𝑘 + 1))))
4140ralimdva 2945 . . . . . . 7 (((𝐹 ∈ Word dom 𝐼𝑃:(0...(#‘𝐹))⟶(Vtx‘𝐺)) ∧ 𝐼:dom 𝐼⟶{𝑥 ∈ 𝒫 𝑉 ∣ 2 ≤ (#‘𝑥)}) → (∀𝑘 ∈ (0..^(#‘𝐹))if-((𝑃𝑘) = (𝑃‘(𝑘 + 1)), (𝐼‘(𝐹𝑘)) = {(𝑃𝑘)}, {(𝑃𝑘), (𝑃‘(𝑘 + 1))} ⊆ (𝐼‘(𝐹𝑘))) → ∀𝑘 ∈ (0..^(#‘𝐹))(𝑃𝑘) ≠ (𝑃‘(𝑘 + 1))))
4241ex 449 . . . . . 6 ((𝐹 ∈ Word dom 𝐼𝑃:(0...(#‘𝐹))⟶(Vtx‘𝐺)) → (𝐼:dom 𝐼⟶{𝑥 ∈ 𝒫 𝑉 ∣ 2 ≤ (#‘𝑥)} → (∀𝑘 ∈ (0..^(#‘𝐹))if-((𝑃𝑘) = (𝑃‘(𝑘 + 1)), (𝐼‘(𝐹𝑘)) = {(𝑃𝑘)}, {(𝑃𝑘), (𝑃‘(𝑘 + 1))} ⊆ (𝐼‘(𝐹𝑘))) → ∀𝑘 ∈ (0..^(#‘𝐹))(𝑃𝑘) ≠ (𝑃‘(𝑘 + 1)))))
4342com23 84 . . . . 5 ((𝐹 ∈ Word dom 𝐼𝑃:(0...(#‘𝐹))⟶(Vtx‘𝐺)) → (∀𝑘 ∈ (0..^(#‘𝐹))if-((𝑃𝑘) = (𝑃‘(𝑘 + 1)), (𝐼‘(𝐹𝑘)) = {(𝑃𝑘)}, {(𝑃𝑘), (𝑃‘(𝑘 + 1))} ⊆ (𝐼‘(𝐹𝑘))) → (𝐼:dom 𝐼⟶{𝑥 ∈ 𝒫 𝑉 ∣ 2 ≤ (#‘𝑥)} → ∀𝑘 ∈ (0..^(#‘𝐹))(𝑃𝑘) ≠ (𝑃‘(𝑘 + 1)))))
44433impia 1253 . . . 4 ((𝐹 ∈ Word dom 𝐼𝑃:(0...(#‘𝐹))⟶(Vtx‘𝐺) ∧ ∀𝑘 ∈ (0..^(#‘𝐹))if-((𝑃𝑘) = (𝑃‘(𝑘 + 1)), (𝐼‘(𝐹𝑘)) = {(𝑃𝑘)}, {(𝑃𝑘), (𝑃‘(𝑘 + 1))} ⊆ (𝐼‘(𝐹𝑘)))) → (𝐼:dom 𝐼⟶{𝑥 ∈ 𝒫 𝑉 ∣ 2 ≤ (#‘𝑥)} → ∀𝑘 ∈ (0..^(#‘𝐹))(𝑃𝑘) ≠ (𝑃‘(𝑘 + 1))))
455, 44syl6bi 242 . . 3 (𝐹(1Walks‘𝐺)𝑃 → (𝐹(1Walks‘𝐺)𝑃 → (𝐼:dom 𝐼⟶{𝑥 ∈ 𝒫 𝑉 ∣ 2 ≤ (#‘𝑥)} → ∀𝑘 ∈ (0..^(#‘𝐹))(𝑃𝑘) ≠ (𝑃‘(𝑘 + 1)))))
4645pm2.43i 50 . 2 (𝐹(1Walks‘𝐺)𝑃 → (𝐼:dom 𝐼⟶{𝑥 ∈ 𝒫 𝑉 ∣ 2 ≤ (#‘𝑥)} → ∀𝑘 ∈ (0..^(#‘𝐹))(𝑃𝑘) ≠ (𝑃‘(𝑘 + 1))))
4746imp 444 1 ((𝐹(1Walks‘𝐺)𝑃𝐼:dom 𝐼⟶{𝑥 ∈ 𝒫 𝑉 ∣ 2 ≤ (#‘𝑥)}) → ∀𝑘 ∈ (0..^(#‘𝐹))(𝑃𝑘) ≠ (𝑃‘(𝑘 + 1)))
 Colors of variables: wff setvar class Syntax hints:  ¬ wn 3   → wi 4   ↔ wb 195   ∧ wa 383  if-wif 1006   ∧ w3a 1031   = wceq 1475   ∈ wcel 1977   ≠ wne 2780  ∀wral 2896  {crab 2900  Vcvv 3173   ⊆ wss 3540  𝒫 cpw 4108  {csn 4125  {cpr 4127   class class class wbr 4583  dom cdm 5038  ⟶wf 5800  ‘cfv 5804  (class class class)co 6549  0cc0 9815  1c1 9816   + caddc 9818   < clt 9953   ≤ cle 9954  2c2 10947  ...cfz 12197  ..^cfzo 12334  #chash 12979  Word cword 13146  Vtxcvtx 25673  iEdgciedg 25674  1Walksc1wlks 40796 This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1713  ax-4 1728  ax-5 1827  ax-6 1875  ax-7 1922  ax-8 1979  ax-9 1986  ax-10 2006  ax-11 2021  ax-12 2034  ax-13 2234  ax-ext 2590  ax-rep 4699  ax-sep 4709  ax-nul 4717  ax-pow 4769  ax-pr 4833  ax-un 6847  ax-cnex 9871  ax-resscn 9872  ax-1cn 9873  ax-icn 9874  ax-addcl 9875  ax-addrcl 9876  ax-mulcl 9877  ax-mulrcl 9878  ax-mulcom 9879  ax-addass 9880  ax-mulass 9881  ax-distr 9882  ax-i2m1 9883  ax-1ne0 9884  ax-1rid 9885  ax-rnegex 9886  ax-rrecex 9887  ax-cnre 9888  ax-pre-lttri 9889  ax-pre-lttrn 9890  ax-pre-ltadd 9891  ax-pre-mulgt0 9892 This theorem depends on definitions:  df-bi 196  df-or 384  df-an 385  df-ifp 1007  df-3or 1032  df-3an 1033  df-tru 1478  df-ex 1696  df-nf 1701  df-sb 1868  df-eu 2462  df-mo 2463  df-clab 2597  df-cleq 2603  df-clel 2606  df-nfc 2740  df-ne 2782  df-nel 2783  df-ral 2901  df-rex 2902  df-reu 2903  df-rab 2905  df-v 3175  df-sbc 3403  df-csb 3500  df-dif 3543  df-un 3545  df-in 3547  df-ss 3554  df-pss 3556  df-nul 3875  df-if 4037  df-pw 4110  df-sn 4126  df-pr 4128  df-tp 4130  df-op 4132  df-uni 4373  df-int 4411  df-iun 4457  df-br 4584  df-opab 4644  df-mpt 4645  df-tr 4681  df-eprel 4949  df-id 4953  df-po 4959  df-so 4960  df-fr 4997  df-we 4999  df-xp 5044  df-rel 5045  df-cnv 5046  df-co 5047  df-dm 5048  df-rn 5049  df-res 5050  df-ima 5051  df-pred 5597  df-ord 5643  df-on 5644  df-lim 5645  df-suc 5646  df-iota 5768  df-fun 5806  df-fn 5807  df-f 5808  df-f1 5809  df-fo 5810  df-f1o 5811  df-fv 5812  df-riota 6511  df-ov 6552  df-oprab 6553  df-mpt2 6554  df-om 6958  df-1st 7059  df-2nd 7060  df-wrecs 7294  df-recs 7355  df-rdg 7393  df-1o 7447  df-er 7629  df-map 7746  df-pm 7747  df-en 7842  df-dom 7843  df-sdom 7844  df-fin 7845  df-card 8648  df-pnf 9955  df-mnf 9956  df-xr 9957  df-ltxr 9958  df-le 9959  df-sub 10147  df-neg 10148  df-nn 10898  df-2 10956  df-n0 11170  df-z 11255  df-uz 11564  df-fz 12198  df-fzo 12335  df-hash 12980  df-word 13154  df-1wlks 40800 This theorem is referenced by:  lfgriswlk  40897
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