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Theorem isclwwlk 29237

Description: Properties of a word to represent a closed walk (in an undirected graph). (Contributed by Alexander van der Vekens, 20-Mar-2018.) (Revised by AV, 24-Apr-2021.)

**Hypotheses**
Ref	Expression
clwwlk.v	⊢ 𝑉 = (Vtx‘𝐺)
clwwlk.e	⊢ 𝐸 = (Edg‘𝐺)

**Assertion**
Ref	Expression
isclwwlk	⊢ (𝑊 ∈ (ClWWalks‘𝐺) ↔ ((𝑊 ∈ Word 𝑉 ∧ 𝑊 ≠ ∅) ∧ ∀𝑖 ∈ (0..^((♯‘𝑊) − 1)){(𝑊‘𝑖), (𝑊‘(𝑖 + 1))} ∈ 𝐸 ∧ {(lastS‘𝑊), (𝑊‘0)} ∈ 𝐸))

Distinct variable groups: 𝑖,𝐺 𝑖,𝑊 Allowed substitution hints: 𝐸(𝑖) 𝑉(𝑖)

Proof of Theorem isclwwlk Dummy variable 𝑤 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		neeq1 3004	. . . 4 ⊢ (𝑤 = 𝑊 → (𝑤 ≠ ∅ ↔ 𝑊 ≠ ∅))
2		fveq2 6892	. . . . . . 7 ⊢ (𝑤 = 𝑊 → (♯‘𝑤) = (♯‘𝑊))
3	2	oveq1d 7424	. . . . . 6 ⊢ (𝑤 = 𝑊 → ((♯‘𝑤) − 1) = ((♯‘𝑊) − 1))
4	3	oveq2d 7425	. . . . 5 ⊢ (𝑤 = 𝑊 → (0..^((♯‘𝑤) − 1)) = (0..^((♯‘𝑊) − 1)))
5		fveq1 6891	. . . . . . 7 ⊢ (𝑤 = 𝑊 → (𝑤‘𝑖) = (𝑊‘𝑖))
6		fveq1 6891	. . . . . . 7 ⊢ (𝑤 = 𝑊 → (𝑤‘(𝑖 + 1)) = (𝑊‘(𝑖 + 1)))
7	5, 6	preq12d 4746	. . . . . 6 ⊢ (𝑤 = 𝑊 → {(𝑤‘𝑖), (𝑤‘(𝑖 + 1))} = {(𝑊‘𝑖), (𝑊‘(𝑖 + 1))})
8	7	eleq1d 2819	. . . . 5 ⊢ (𝑤 = 𝑊 → ({(𝑤‘𝑖), (𝑤‘(𝑖 + 1))} ∈ 𝐸 ↔ {(𝑊‘𝑖), (𝑊‘(𝑖 + 1))} ∈ 𝐸))
9	4, 8	raleqbidv 3343	. . . 4 ⊢ (𝑤 = 𝑊 → (∀𝑖 ∈ (0..^((♯‘𝑤) − 1)){(𝑤‘𝑖), (𝑤‘(𝑖 + 1))} ∈ 𝐸 ↔ ∀𝑖 ∈ (0..^((♯‘𝑊) − 1)){(𝑊‘𝑖), (𝑊‘(𝑖 + 1))} ∈ 𝐸))
10		fveq2 6892	. . . . . 6 ⊢ (𝑤 = 𝑊 → (lastS‘𝑤) = (lastS‘𝑊))
11		fveq1 6891	. . . . . 6 ⊢ (𝑤 = 𝑊 → (𝑤‘0) = (𝑊‘0))
12	10, 11	preq12d 4746	. . . . 5 ⊢ (𝑤 = 𝑊 → {(lastS‘𝑤), (𝑤‘0)} = {(lastS‘𝑊), (𝑊‘0)})
13	12	eleq1d 2819	. . . 4 ⊢ (𝑤 = 𝑊 → ({(lastS‘𝑤), (𝑤‘0)} ∈ 𝐸 ↔ {(lastS‘𝑊), (𝑊‘0)} ∈ 𝐸))
14	1, 9, 13	3anbi123d 1437	. . 3 ⊢ (𝑤 = 𝑊 → ((𝑤 ≠ ∅ ∧ ∀𝑖 ∈ (0..^((♯‘𝑤) − 1)){(𝑤‘𝑖), (𝑤‘(𝑖 + 1))} ∈ 𝐸 ∧ {(lastS‘𝑤), (𝑤‘0)} ∈ 𝐸) ↔ (𝑊 ≠ ∅ ∧ ∀𝑖 ∈ (0..^((♯‘𝑊) − 1)){(𝑊‘𝑖), (𝑊‘(𝑖 + 1))} ∈ 𝐸 ∧ {(lastS‘𝑊), (𝑊‘0)} ∈ 𝐸)))
15	14	elrab 3684	. 2 ⊢ (𝑊 ∈ {𝑤 ∈ Word 𝑉 ∣ (𝑤 ≠ ∅ ∧ ∀𝑖 ∈ (0..^((♯‘𝑤) − 1)){(𝑤‘𝑖), (𝑤‘(𝑖 + 1))} ∈ 𝐸 ∧ {(lastS‘𝑤), (𝑤‘0)} ∈ 𝐸)} ↔ (𝑊 ∈ Word 𝑉 ∧ (𝑊 ≠ ∅ ∧ ∀𝑖 ∈ (0..^((♯‘𝑊) − 1)){(𝑊‘𝑖), (𝑊‘(𝑖 + 1))} ∈ 𝐸 ∧ {(lastS‘𝑊), (𝑊‘0)} ∈ 𝐸)))
16		clwwlk.v	. . . 4 ⊢ 𝑉 = (Vtx‘𝐺)
17		clwwlk.e	. . . 4 ⊢ 𝐸 = (Edg‘𝐺)
18	16, 17	clwwlk 29236	. . 3 ⊢ (ClWWalks‘𝐺) = {𝑤 ∈ Word 𝑉 ∣ (𝑤 ≠ ∅ ∧ ∀𝑖 ∈ (0..^((♯‘𝑤) − 1)){(𝑤‘𝑖), (𝑤‘(𝑖 + 1))} ∈ 𝐸 ∧ {(lastS‘𝑤), (𝑤‘0)} ∈ 𝐸)}
19	18	eleq2i 2826	. 2 ⊢ (𝑊 ∈ (ClWWalks‘𝐺) ↔ 𝑊 ∈ {𝑤 ∈ Word 𝑉 ∣ (𝑤 ≠ ∅ ∧ ∀𝑖 ∈ (0..^((♯‘𝑤) − 1)){(𝑤‘𝑖), (𝑤‘(𝑖 + 1))} ∈ 𝐸 ∧ {(lastS‘𝑤), (𝑤‘0)} ∈ 𝐸)})
20		3anass 1096	. . 3 ⊢ (((𝑊 ∈ Word 𝑉 ∧ 𝑊 ≠ ∅) ∧ ∀𝑖 ∈ (0..^((♯‘𝑊) − 1)){(𝑊‘𝑖), (𝑊‘(𝑖 + 1))} ∈ 𝐸 ∧ {(lastS‘𝑊), (𝑊‘0)} ∈ 𝐸) ↔ ((𝑊 ∈ Word 𝑉 ∧ 𝑊 ≠ ∅) ∧ (∀𝑖 ∈ (0..^((♯‘𝑊) − 1)){(𝑊‘𝑖), (𝑊‘(𝑖 + 1))} ∈ 𝐸 ∧ {(lastS‘𝑊), (𝑊‘0)} ∈ 𝐸)))
21		anass 470	. . 3 ⊢ (((𝑊 ∈ Word 𝑉 ∧ 𝑊 ≠ ∅) ∧ (∀𝑖 ∈ (0..^((♯‘𝑊) − 1)){(𝑊‘𝑖), (𝑊‘(𝑖 + 1))} ∈ 𝐸 ∧ {(lastS‘𝑊), (𝑊‘0)} ∈ 𝐸)) ↔ (𝑊 ∈ Word 𝑉 ∧ (𝑊 ≠ ∅ ∧ (∀𝑖 ∈ (0..^((♯‘𝑊) − 1)){(𝑊‘𝑖), (𝑊‘(𝑖 + 1))} ∈ 𝐸 ∧ {(lastS‘𝑊), (𝑊‘0)} ∈ 𝐸))))
22		3anass 1096	. . . . 5 ⊢ ((𝑊 ≠ ∅ ∧ ∀𝑖 ∈ (0..^((♯‘𝑊) − 1)){(𝑊‘𝑖), (𝑊‘(𝑖 + 1))} ∈ 𝐸 ∧ {(lastS‘𝑊), (𝑊‘0)} ∈ 𝐸) ↔ (𝑊 ≠ ∅ ∧ (∀𝑖 ∈ (0..^((♯‘𝑊) − 1)){(𝑊‘𝑖), (𝑊‘(𝑖 + 1))} ∈ 𝐸 ∧ {(lastS‘𝑊), (𝑊‘0)} ∈ 𝐸)))
23	22	bicomi 223	. . . 4 ⊢ ((𝑊 ≠ ∅ ∧ (∀𝑖 ∈ (0..^((♯‘𝑊) − 1)){(𝑊‘𝑖), (𝑊‘(𝑖 + 1))} ∈ 𝐸 ∧ {(lastS‘𝑊), (𝑊‘0)} ∈ 𝐸)) ↔ (𝑊 ≠ ∅ ∧ ∀𝑖 ∈ (0..^((♯‘𝑊) − 1)){(𝑊‘𝑖), (𝑊‘(𝑖 + 1))} ∈ 𝐸 ∧ {(lastS‘𝑊), (𝑊‘0)} ∈ 𝐸))
24	23	anbi2i 624	. . 3 ⊢ ((𝑊 ∈ Word 𝑉 ∧ (𝑊 ≠ ∅ ∧ (∀𝑖 ∈ (0..^((♯‘𝑊) − 1)){(𝑊‘𝑖), (𝑊‘(𝑖 + 1))} ∈ 𝐸 ∧ {(lastS‘𝑊), (𝑊‘0)} ∈ 𝐸))) ↔ (𝑊 ∈ Word 𝑉 ∧ (𝑊 ≠ ∅ ∧ ∀𝑖 ∈ (0..^((♯‘𝑊) − 1)){(𝑊‘𝑖), (𝑊‘(𝑖 + 1))} ∈ 𝐸 ∧ {(lastS‘𝑊), (𝑊‘0)} ∈ 𝐸)))
25	20, 21, 24	3bitri 297	. 2 ⊢ (((𝑊 ∈ Word 𝑉 ∧ 𝑊 ≠ ∅) ∧ ∀𝑖 ∈ (0..^((♯‘𝑊) − 1)){(𝑊‘𝑖), (𝑊‘(𝑖 + 1))} ∈ 𝐸 ∧ {(lastS‘𝑊), (𝑊‘0)} ∈ 𝐸) ↔ (𝑊 ∈ Word 𝑉 ∧ (𝑊 ≠ ∅ ∧ ∀𝑖 ∈ (0..^((♯‘𝑊) − 1)){(𝑊‘𝑖), (𝑊‘(𝑖 + 1))} ∈ 𝐸 ∧ {(lastS‘𝑊), (𝑊‘0)} ∈ 𝐸)))
26	15, 19, 25	3bitr4i 303	1 ⊢ (𝑊 ∈ (ClWWalks‘𝐺) ↔ ((𝑊 ∈ Word 𝑉 ∧ 𝑊 ≠ ∅) ∧ ∀𝑖 ∈ (0..^((♯‘𝑊) − 1)){(𝑊‘𝑖), (𝑊‘(𝑖 + 1))} ∈ 𝐸 ∧ {(lastS‘𝑊), (𝑊‘0)} ∈ 𝐸))

Colors of variables: wff setvar class

Syntax hints: ↔ wb 205 ∧ wa 397 ∧ w3a 1088 = wceq 1542 ∈ wcel 2107 ≠ wne 2941 ∀wral 3062 {crab 3433 ∅c0 4323 {cpr 4631 ‘cfv 6544 (class class class)co 7409 0cc0 11110 1c1 11111 + caddc 11113 − cmin 11444 ..^cfzo 13627 ♯chash 14290 Word cword 14464 lastSclsw 14512 Vtxcvtx 28256 Edgcedg 28307 ClWWalkscclwwlk 29234

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1798 ax-4 1812 ax-5 1914 ax-6 1972 ax-7 2012 ax-8 2109 ax-9 2117 ax-10 2138 ax-11 2155 ax-12 2172 ax-ext 2704 ax-rep 5286 ax-sep 5300 ax-nul 5307 ax-pow 5364 ax-pr 5428 ax-un 7725 ax-cnex 11166 ax-resscn 11167 ax-1cn 11168 ax-icn 11169 ax-addcl 11170 ax-addrcl 11171 ax-mulcl 11172 ax-mulrcl 11173 ax-mulcom 11174 ax-addass 11175 ax-mulass 11176 ax-distr 11177 ax-i2m1 11178 ax-1ne0 11179 ax-1rid 11180 ax-rnegex 11181 ax-rrecex 11182 ax-cnre 11183 ax-pre-lttri 11184 ax-pre-lttrn 11185 ax-pre-ltadd 11186 ax-pre-mulgt0 11187

This theorem depends on definitions: df-bi 206 df-an 398 df-or 847 df-3or 1089 df-3an 1090 df-tru 1545 df-fal 1555 df-ex 1783 df-nf 1787 df-sb 2069 df-mo 2535 df-eu 2564 df-clab 2711 df-cleq 2725 df-clel 2811 df-nfc 2886 df-ne 2942 df-nel 3048 df-ral 3063 df-rex 3072 df-reu 3378 df-rab 3434 df-v 3477 df-sbc 3779 df-csb 3895 df-dif 3952 df-un 3954 df-in 3956 df-ss 3966 df-pss 3968 df-nul 4324 df-if 4530 df-pw 4605 df-sn 4630 df-pr 4632 df-op 4636 df-uni 4910 df-int 4952 df-iun 5000 df-br 5150 df-opab 5212 df-mpt 5233 df-tr 5267 df-id 5575 df-eprel 5581 df-po 5589 df-so 5590 df-fr 5632 df-we 5634 df-xp 5683 df-rel 5684 df-cnv 5685 df-co 5686 df-dm 5687 df-rn 5688 df-res 5689 df-ima 5690 df-pred 6301 df-ord 6368 df-on 6369 df-lim 6370 df-suc 6371 df-iota 6496 df-fun 6546 df-fn 6547 df-f 6548 df-f1 6549 df-fo 6550 df-f1o 6551 df-fv 6552 df-riota 7365 df-ov 7412 df-oprab 7413 df-mpo 7414 df-om 7856 df-1st 7975 df-2nd 7976 df-frecs 8266 df-wrecs 8297 df-recs 8371 df-rdg 8410 df-1o 8466 df-er 8703 df-map 8822 df-en 8940 df-dom 8941 df-sdom 8942 df-fin 8943 df-card 9934 df-pnf 11250 df-mnf 11251 df-xr 11252 df-ltxr 11253 df-le 11254 df-sub 11446 df-neg 11447 df-nn 12213 df-n0 12473 df-z 12559 df-uz 12823 df-fz 13485 df-fzo 13628 df-hash 14291 df-word 14465 df-clwwlk 29235

This theorem is referenced by: clwwlkbp 29238 clwwlk1loop 29241 clwwlkccat 29243 clwlkclwwlk 29255 clwwisshclwws 29268 isclwwlknx 29289 clwwlknwwlksn 29291 clwwlkinwwlk 29293 clwwlkwwlksb 29307 clwwlknonel 29348

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