Theorem swrdwlk 35192

Description: Two matching subwords of a walk also represent a walk. (Contributed by BTernaryTau, 7-Dec-2023.)

Assertion

Ref	Expression
swrdwlk	⊢ ((𝐹(Walks‘𝐺)𝑃 ∧ 𝐵 ∈ (0...𝐿) ∧ 𝐿 ∈ (0...(♯‘𝐹))) → (𝐹 substr ⟨𝐵, 𝐿⟩)(Walks‘𝐺)(𝑃 substr ⟨𝐵, (𝐿 + 1)⟩))

Proof of Theorem swrdwlk

Step	Hyp	Ref	Expression
1		pfxwlk 35189	. . . . . . 7 ⊢ ((𝐹(Walks‘𝐺)𝑃 ∧ 𝐿 ∈ (0...(♯‘𝐹))) → (𝐹 prefix 𝐿)(Walks‘𝐺)(𝑃 prefix (𝐿 + 1)))
2	1	3adant2 1131	. . . . . 6 ⊢ ((𝐹(Walks‘𝐺)𝑃 ∧ 𝐵 ∈ (0...𝐿) ∧ 𝐿 ∈ (0...(♯‘𝐹))) → (𝐹 prefix 𝐿)(Walks‘𝐺)(𝑃 prefix (𝐿 + 1)))
3		revwlk 35190	. . . . . 6 ⊢ ((𝐹 prefix 𝐿)(Walks‘𝐺)(𝑃 prefix (𝐿 + 1)) → (reverse‘(𝐹 prefix 𝐿))(Walks‘𝐺)(reverse‘(𝑃 prefix (𝐿 + 1))))
4	2, 3	syl 17	. . . . 5 ⊢ ((𝐹(Walks‘𝐺)𝑃 ∧ 𝐵 ∈ (0...𝐿) ∧ 𝐿 ∈ (0...(♯‘𝐹))) → (reverse‘(𝐹 prefix 𝐿))(Walks‘𝐺)(reverse‘(𝑃 prefix (𝐿 + 1))))
5		fznn0sub2 13537	. . . . . . 7 ⊢ (𝐵 ∈ (0...𝐿) → (𝐿 − 𝐵) ∈ (0...𝐿))
6	5	3ad2ant2 1134	. . . . . 6 ⊢ ((𝐹(Walks‘𝐺)𝑃 ∧ 𝐵 ∈ (0...𝐿) ∧ 𝐿 ∈ (0...(♯‘𝐹))) → (𝐿 − 𝐵) ∈ (0...𝐿))
7		eqid 2733	. . . . . . . . . . 11 ⊢ (iEdg‘𝐺) = (iEdg‘𝐺)
8	7	wlkf 29595	. . . . . . . . . 10 ⊢ (𝐹(Walks‘𝐺)𝑃 → 𝐹 ∈ Word dom (iEdg‘𝐺))
9	8	3ad2ant1 1133	. . . . . . . . 9 ⊢ ((𝐹(Walks‘𝐺)𝑃 ∧ 𝐵 ∈ (0...𝐿) ∧ 𝐿 ∈ (0...(♯‘𝐹))) → 𝐹 ∈ Word dom (iEdg‘𝐺))
10		pfxcl 14587	. . . . . . . . 9 ⊢ (𝐹 ∈ Word dom (iEdg‘𝐺) → (𝐹 prefix 𝐿) ∈ Word dom (iEdg‘𝐺))
11		revlen 14671	. . . . . . . . 9 ⊢ ((𝐹 prefix 𝐿) ∈ Word dom (iEdg‘𝐺) → (♯‘(reverse‘(𝐹 prefix 𝐿))) = (♯‘(𝐹 prefix 𝐿)))
12	9, 10, 11	3syl 18	. . . . . . . 8 ⊢ ((𝐹(Walks‘𝐺)𝑃 ∧ 𝐵 ∈ (0...𝐿) ∧ 𝐿 ∈ (0...(♯‘𝐹))) → (♯‘(reverse‘(𝐹 prefix 𝐿))) = (♯‘(𝐹 prefix 𝐿)))
13		pfxlen 14593	. . . . . . . . . 10 ⊢ ((𝐹 ∈ Word dom (iEdg‘𝐺) ∧ 𝐿 ∈ (0...(♯‘𝐹))) → (♯‘(𝐹 prefix 𝐿)) = 𝐿)
14	8, 13	sylan 580	. . . . . . . . 9 ⊢ ((𝐹(Walks‘𝐺)𝑃 ∧ 𝐿 ∈ (0...(♯‘𝐹))) → (♯‘(𝐹 prefix 𝐿)) = 𝐿)
15	14	3adant2 1131	. . . . . . . 8 ⊢ ((𝐹(Walks‘𝐺)𝑃 ∧ 𝐵 ∈ (0...𝐿) ∧ 𝐿 ∈ (0...(♯‘𝐹))) → (♯‘(𝐹 prefix 𝐿)) = 𝐿)
16	12, 15	eqtrd 2768	. . . . . . 7 ⊢ ((𝐹(Walks‘𝐺)𝑃 ∧ 𝐵 ∈ (0...𝐿) ∧ 𝐿 ∈ (0...(♯‘𝐹))) → (♯‘(reverse‘(𝐹 prefix 𝐿))) = 𝐿)
17	16	oveq2d 7368	. . . . . 6 ⊢ ((𝐹(Walks‘𝐺)𝑃 ∧ 𝐵 ∈ (0...𝐿) ∧ 𝐿 ∈ (0...(♯‘𝐹))) → (0...(♯‘(reverse‘(𝐹 prefix 𝐿)))) = (0...𝐿))
18	6, 17	eleqtrrd 2836	. . . . 5 ⊢ ((𝐹(Walks‘𝐺)𝑃 ∧ 𝐵 ∈ (0...𝐿) ∧ 𝐿 ∈ (0...(♯‘𝐹))) → (𝐿 − 𝐵) ∈ (0...(♯‘(reverse‘(𝐹 prefix 𝐿)))))
19		pfxwlk 35189	. . . . 5 ⊢ (((reverse‘(𝐹 prefix 𝐿))(Walks‘𝐺)(reverse‘(𝑃 prefix (𝐿 + 1))) ∧ (𝐿 − 𝐵) ∈ (0...(♯‘(reverse‘(𝐹 prefix 𝐿))))) → ((reverse‘(𝐹 prefix 𝐿)) prefix (𝐿 − 𝐵))(Walks‘𝐺)((reverse‘(𝑃 prefix (𝐿 + 1))) prefix ((𝐿 − 𝐵) + 1)))
20	4, 18, 19	syl2anc 584	. . . 4 ⊢ ((𝐹(Walks‘𝐺)𝑃 ∧ 𝐵 ∈ (0...𝐿) ∧ 𝐿 ∈ (0...(♯‘𝐹))) → ((reverse‘(𝐹 prefix 𝐿)) prefix (𝐿 − 𝐵))(Walks‘𝐺)((reverse‘(𝑃 prefix (𝐿 + 1))) prefix ((𝐿 − 𝐵) + 1)))
21		elfzel2 13424	. . . . . . . 8 ⊢ (𝐵 ∈ (0...𝐿) → 𝐿 ∈ ℤ)
22	21	3ad2ant2 1134	. . . . . . 7 ⊢ ((𝐹(Walks‘𝐺)𝑃 ∧ 𝐵 ∈ (0...𝐿) ∧ 𝐿 ∈ (0...(♯‘𝐹))) → 𝐿 ∈ ℤ)
23	22	zcnd 12584	. . . . . 6 ⊢ ((𝐹(Walks‘𝐺)𝑃 ∧ 𝐵 ∈ (0...𝐿) ∧ 𝐿 ∈ (0...(♯‘𝐹))) → 𝐿 ∈ ℂ)
24		1cnd 11114	. . . . . 6 ⊢ ((𝐹(Walks‘𝐺)𝑃 ∧ 𝐵 ∈ (0...𝐿) ∧ 𝐿 ∈ (0...(♯‘𝐹))) → 1 ∈ ℂ)
25		elfzelz 13426	. . . . . . . 8 ⊢ (𝐵 ∈ (0...𝐿) → 𝐵 ∈ ℤ)
26	25	3ad2ant2 1134	. . . . . . 7 ⊢ ((𝐹(Walks‘𝐺)𝑃 ∧ 𝐵 ∈ (0...𝐿) ∧ 𝐿 ∈ (0...(♯‘𝐹))) → 𝐵 ∈ ℤ)
27	26	zcnd 12584	. . . . . 6 ⊢ ((𝐹(Walks‘𝐺)𝑃 ∧ 𝐵 ∈ (0...𝐿) ∧ 𝐿 ∈ (0...(♯‘𝐹))) → 𝐵 ∈ ℂ)
28	23, 24, 27	addsubd 11500	. . . . 5 ⊢ ((𝐹(Walks‘𝐺)𝑃 ∧ 𝐵 ∈ (0...𝐿) ∧ 𝐿 ∈ (0...(♯‘𝐹))) → ((𝐿 + 1) − 𝐵) = ((𝐿 − 𝐵) + 1))
29	28	oveq2d 7368	. . . 4 ⊢ ((𝐹(Walks‘𝐺)𝑃 ∧ 𝐵 ∈ (0...𝐿) ∧ 𝐿 ∈ (0...(♯‘𝐹))) → ((reverse‘(𝑃 prefix (𝐿 + 1))) prefix ((𝐿 + 1) − 𝐵)) = ((reverse‘(𝑃 prefix (𝐿 + 1))) prefix ((𝐿 − 𝐵) + 1)))
30	20, 29	breqtrrd 5121	. . 3 ⊢ ((𝐹(Walks‘𝐺)𝑃 ∧ 𝐵 ∈ (0...𝐿) ∧ 𝐿 ∈ (0...(♯‘𝐹))) → ((reverse‘(𝐹 prefix 𝐿)) prefix (𝐿 − 𝐵))(Walks‘𝐺)((reverse‘(𝑃 prefix (𝐿 + 1))) prefix ((𝐿 + 1) − 𝐵)))
31		revwlk 35190	. . 3 ⊢ (((reverse‘(𝐹 prefix 𝐿)) prefix (𝐿 − 𝐵))(Walks‘𝐺)((reverse‘(𝑃 prefix (𝐿 + 1))) prefix ((𝐿 + 1) − 𝐵)) → (reverse‘((reverse‘(𝐹 prefix 𝐿)) prefix (𝐿 − 𝐵)))(Walks‘𝐺)(reverse‘((reverse‘(𝑃 prefix (𝐿 + 1))) prefix ((𝐿 + 1) − 𝐵))))
32	30, 31	syl 17	. 2 ⊢ ((𝐹(Walks‘𝐺)𝑃 ∧ 𝐵 ∈ (0...𝐿) ∧ 𝐿 ∈ (0...(♯‘𝐹))) → (reverse‘((reverse‘(𝐹 prefix 𝐿)) prefix (𝐿 − 𝐵)))(Walks‘𝐺)(reverse‘((reverse‘(𝑃 prefix (𝐿 + 1))) prefix ((𝐿 + 1) − 𝐵))))
33		swrdrevpfx 35182	. . 3 ⊢ ((𝐹 ∈ Word dom (iEdg‘𝐺) ∧ 𝐵 ∈ (0...𝐿) ∧ 𝐿 ∈ (0...(♯‘𝐹))) → (𝐹 substr ⟨𝐵, 𝐿⟩) = (reverse‘((reverse‘(𝐹 prefix 𝐿)) prefix (𝐿 − 𝐵))))
34	8, 33	syl3an1 1163	. 2 ⊢ ((𝐹(Walks‘𝐺)𝑃 ∧ 𝐵 ∈ (0...𝐿) ∧ 𝐿 ∈ (0...(♯‘𝐹))) → (𝐹 substr ⟨𝐵, 𝐿⟩) = (reverse‘((reverse‘(𝐹 prefix 𝐿)) prefix (𝐿 − 𝐵))))
35		eqid 2733	. . . . 5 ⊢ (Vtx‘𝐺) = (Vtx‘𝐺)
36	35	wlkpwrd 29598	. . . 4 ⊢ (𝐹(Walks‘𝐺)𝑃 → 𝑃 ∈ Word (Vtx‘𝐺))
37	36	3ad2ant1 1133	. . 3 ⊢ ((𝐹(Walks‘𝐺)𝑃 ∧ 𝐵 ∈ (0...𝐿) ∧ 𝐿 ∈ (0...(♯‘𝐹))) → 𝑃 ∈ Word (Vtx‘𝐺))
38		fzelp1 13478	. . . 4 ⊢ (𝐵 ∈ (0...𝐿) → 𝐵 ∈ (0...(𝐿 + 1)))
39	38	3ad2ant2 1134	. . 3 ⊢ ((𝐹(Walks‘𝐺)𝑃 ∧ 𝐵 ∈ (0...𝐿) ∧ 𝐿 ∈ (0...(♯‘𝐹))) → 𝐵 ∈ (0...(𝐿 + 1)))
40		fzp1elp1 13479	. . . . 5 ⊢ (𝐿 ∈ (0...(♯‘𝐹)) → (𝐿 + 1) ∈ (0...((♯‘𝐹) + 1)))
41	40	3ad2ant3 1135	. . . 4 ⊢ ((𝐹(Walks‘𝐺)𝑃 ∧ 𝐵 ∈ (0...𝐿) ∧ 𝐿 ∈ (0...(♯‘𝐹))) → (𝐿 + 1) ∈ (0...((♯‘𝐹) + 1)))
42		wlklenvp1 29599	. . . . . 6 ⊢ (𝐹(Walks‘𝐺)𝑃 → (♯‘𝑃) = ((♯‘𝐹) + 1))
43	42	3ad2ant1 1133	. . . . 5 ⊢ ((𝐹(Walks‘𝐺)𝑃 ∧ 𝐵 ∈ (0...𝐿) ∧ 𝐿 ∈ (0...(♯‘𝐹))) → (♯‘𝑃) = ((♯‘𝐹) + 1))
44	43	oveq2d 7368	. . . 4 ⊢ ((𝐹(Walks‘𝐺)𝑃 ∧ 𝐵 ∈ (0...𝐿) ∧ 𝐿 ∈ (0...(♯‘𝐹))) → (0...(♯‘𝑃)) = (0...((♯‘𝐹) + 1)))
45	41, 44	eleqtrrd 2836	. . 3 ⊢ ((𝐹(Walks‘𝐺)𝑃 ∧ 𝐵 ∈ (0...𝐿) ∧ 𝐿 ∈ (0...(♯‘𝐹))) → (𝐿 + 1) ∈ (0...(♯‘𝑃)))
46		swrdrevpfx 35182	. . 3 ⊢ ((𝑃 ∈ Word (Vtx‘𝐺) ∧ 𝐵 ∈ (0...(𝐿 + 1)) ∧ (𝐿 + 1) ∈ (0...(♯‘𝑃))) → (𝑃 substr ⟨𝐵, (𝐿 + 1)⟩) = (reverse‘((reverse‘(𝑃 prefix (𝐿 + 1))) prefix ((𝐿 + 1) − 𝐵))))
47	37, 39, 45, 46	syl3anc 1373	. 2 ⊢ ((𝐹(Walks‘𝐺)𝑃 ∧ 𝐵 ∈ (0...𝐿) ∧ 𝐿 ∈ (0...(♯‘𝐹))) → (𝑃 substr ⟨𝐵, (𝐿 + 1)⟩) = (reverse‘((reverse‘(𝑃 prefix (𝐿 + 1))) prefix ((𝐿 + 1) − 𝐵))))
48	32, 34, 47	3brtr4d 5125	1 ⊢ ((𝐹(Walks‘𝐺)𝑃 ∧ 𝐵 ∈ (0...𝐿) ∧ 𝐿 ∈ (0...(♯‘𝐹))) → (𝐹 substr ⟨𝐵, 𝐿⟩)(Walks‘𝐺)(𝑃 substr ⟨𝐵, (𝐿 + 1)⟩))

Syntax hints:   → wi 4   ∧ w3a 1086   = wceq 1541   ∈ wcel 2113  ⟨cop 4581   class class class wbr 5093  dom cdm 5619  ‘cfv 6486  (class class class)co 7352  0cc0 11013  1c1 11014   + caddc 11016   − cmin 11351  ℤcz 12475  ...cfz 13409  ♯chash 14239  Word cword 14422   substr csubstr 14550   prefix cpfx 14580  reversecreverse 14667  Vtxcvtx 28976  iEdgciedg 28977  Walkscwlks 29577

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 1968  ax-7 2009  ax-8 2115  ax-9 2123  ax-10 2146  ax-11 2162  ax-12 2182  ax-ext 2705  ax-rep 5219  ax-sep 5236  ax-nul 5246  ax-pow 5305  ax-pr 5372  ax-un 7674  ax-cnex 11069  ax-resscn 11070  ax-1cn 11071  ax-icn 11072  ax-addcl 11073  ax-addrcl 11074  ax-mulcl 11075  ax-mulrcl 11076  ax-mulcom 11077  ax-addass 11078  ax-mulass 11079  ax-distr 11080  ax-i2m1 11081  ax-1ne0 11082  ax-1rid 11083  ax-rnegex 11084  ax-rrecex 11085  ax-cnre 11086  ax-pre-lttri 11087  ax-pre-lttrn 11088  ax-pre-ltadd 11089  ax-pre-mulgt0 11090

This theorem depends on definitions:  df-bi 207  df-an 396  df-or 848  df-ifp 1063  df-3or 1087  df-3an 1088  df-tru 1544  df-fal 1554  df-ex 1781  df-nf 1785  df-sb 2068  df-mo 2537  df-eu 2566  df-clab 2712  df-cleq 2725  df-clel 2808  df-nfc 2882  df-ne 2930  df-nel 3034  df-ral 3049  df-rex 3058  df-reu 3348  df-rab 3397  df-v 3439  df-sbc 3738  df-csb 3847  df-dif 3901  df-un 3903  df-in 3905  df-ss 3915  df-pss 3918  df-nul 4283  df-if 4475  df-pw 4551  df-sn 4576  df-pr 4578  df-op 4582  df-uni 4859  df-int 4898  df-iun 4943  df-br 5094  df-opab 5156  df-mpt 5175  df-tr 5201  df-id 5514  df-eprel 5519  df-po 5527  df-so 5528  df-fr 5572  df-we 5574  df-xp 5625  df-rel 5626  df-cnv 5627  df-co 5628  df-dm 5629  df-rn 5630  df-res 5631  df-ima 5632  df-pred 6253  df-ord 6314  df-on 6315  df-lim 6316  df-suc 6317  df-iota 6442  df-fun 6488  df-fn 6489  df-f 6490  df-f1 6491  df-fo 6492  df-f1o 6493  df-fv 6494  df-riota 7309  df-ov 7355  df-oprab 7356  df-mpo 7357  df-om 7803  df-1st 7927  df-2nd 7928  df-frecs 8217  df-wrecs 8248  df-recs 8297  df-rdg 8335  df-1o 8391  df-er 8628  df-map 8758  df-pm 8759  df-en 8876  df-dom 8877  df-sdom 8878  df-fin 8879  df-card 9839  df-pnf 11155  df-mnf 11156  df-xr 11157  df-ltxr 11158  df-le 11159  df-sub 11353  df-neg 11354  df-nn 12133  df-2 12195  df-n0 12389  df-z 12476  df-uz 12739  df-fz 13410  df-fzo 13557  df-hash 14240  df-word 14423  df-substr 14551  df-pfx 14581  df-reverse 14668  df-wlks 29580

This theorem is referenced by: (None)