iswwlksnx - Metamath Proof Explorer

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Theorem iswwlksnx 29362

Description: Properties of a word to represent a walk of a fixed length, definition of WWalks expanded. (Contributed by AV, 28-Apr-2021.)

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

**Assertion**
Ref	Expression
iswwlksnx	⊢ (𝑁 ∈ ℕ₀ → (𝑊 ∈ (𝑁 WWalksN 𝐺) ↔ (𝑊 ∈ Word 𝑉 ∧ ∀𝑖 ∈ (0..^((♯‘𝑊) − 1)){(𝑊‘𝑖), (𝑊‘(𝑖 + 1))} ∈ 𝐸 ∧ (♯‘𝑊) = (𝑁 + 1))))

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

**Proof of Theorem iswwlksnx**
Step	Hyp	Ref	Expression
1		iswwlksn 29360	. 2 ⊢ (𝑁 ∈ ℕ₀ → (𝑊 ∈ (𝑁 WWalksN 𝐺) ↔ (𝑊 ∈ (WWalks‘𝐺) ∧ (♯‘𝑊) = (𝑁 + 1))))
2		iswwlksnx.v	. . . . . . 7 ⊢ 𝑉 = (Vtx‘𝐺)
3		iswwlksnx.e	. . . . . . 7 ⊢ 𝐸 = (Edg‘𝐺)
4	2, 3	iswwlks 29358	. . . . . 6 ⊢ (𝑊 ∈ (WWalks‘𝐺) ↔ (𝑊 ≠ ∅ ∧ 𝑊 ∈ Word 𝑉 ∧ ∀𝑖 ∈ (0..^((♯‘𝑊) − 1)){(𝑊‘𝑖), (𝑊‘(𝑖 + 1))} ∈ 𝐸))
5		df-3an 1088	. . . . . . 7 ⊢ ((𝑊 ≠ ∅ ∧ 𝑊 ∈ Word 𝑉 ∧ ∀𝑖 ∈ (0..^((♯‘𝑊) − 1)){(𝑊‘𝑖), (𝑊‘(𝑖 + 1))} ∈ 𝐸) ↔ ((𝑊 ≠ ∅ ∧ 𝑊 ∈ Word 𝑉) ∧ ∀𝑖 ∈ (0..^((♯‘𝑊) − 1)){(𝑊‘𝑖), (𝑊‘(𝑖 + 1))} ∈ 𝐸))
6		nn0p1gt0 12506	. . . . . . . . . . . . . 14 ⊢ (𝑁 ∈ ℕ₀ → 0 < (𝑁 + 1))
7	6	gt0ne0d 11783	. . . . . . . . . . . . 13 ⊢ (𝑁 ∈ ℕ₀ → (𝑁 + 1) ≠ 0)
8	7	adantr 480	. . . . . . . . . . . 12 ⊢ ((𝑁 ∈ ℕ₀ ∧ (♯‘𝑊) = (𝑁 + 1)) → (𝑁 + 1) ≠ 0)
9		neeq1 3002	. . . . . . . . . . . . 13 ⊢ ((♯‘𝑊) = (𝑁 + 1) → ((♯‘𝑊) ≠ 0 ↔ (𝑁 + 1) ≠ 0))
10	9	adantl 481	. . . . . . . . . . . 12 ⊢ ((𝑁 ∈ ℕ₀ ∧ (♯‘𝑊) = (𝑁 + 1)) → ((♯‘𝑊) ≠ 0 ↔ (𝑁 + 1) ≠ 0))
11	8, 10	mpbird 257	. . . . . . . . . . 11 ⊢ ((𝑁 ∈ ℕ₀ ∧ (♯‘𝑊) = (𝑁 + 1)) → (♯‘𝑊) ≠ 0)
12		hasheq0 14328	. . . . . . . . . . . 12 ⊢ (𝑊 ∈ Word 𝑉 → ((♯‘𝑊) = 0 ↔ 𝑊 = ∅))
13	12	necon3bid 2984	. . . . . . . . . . 11 ⊢ (𝑊 ∈ Word 𝑉 → ((♯‘𝑊) ≠ 0 ↔ 𝑊 ≠ ∅))
14	11, 13	syl5ibcom 244	. . . . . . . . . 10 ⊢ ((𝑁 ∈ ℕ₀ ∧ (♯‘𝑊) = (𝑁 + 1)) → (𝑊 ∈ Word 𝑉 → 𝑊 ≠ ∅))
15	14	pm4.71rd 562	. . . . . . . . 9 ⊢ ((𝑁 ∈ ℕ₀ ∧ (♯‘𝑊) = (𝑁 + 1)) → (𝑊 ∈ Word 𝑉 ↔ (𝑊 ≠ ∅ ∧ 𝑊 ∈ Word 𝑉)))
16	15	bicomd 222	. . . . . . . 8 ⊢ ((𝑁 ∈ ℕ₀ ∧ (♯‘𝑊) = (𝑁 + 1)) → ((𝑊 ≠ ∅ ∧ 𝑊 ∈ Word 𝑉) ↔ 𝑊 ∈ Word 𝑉))
17	16	anbi1d 629	. . . . . . 7 ⊢ ((𝑁 ∈ ℕ₀ ∧ (♯‘𝑊) = (𝑁 + 1)) → (((𝑊 ≠ ∅ ∧ 𝑊 ∈ Word 𝑉) ∧ ∀𝑖 ∈ (0..^((♯‘𝑊) − 1)){(𝑊‘𝑖), (𝑊‘(𝑖 + 1))} ∈ 𝐸) ↔ (𝑊 ∈ Word 𝑉 ∧ ∀𝑖 ∈ (0..^((♯‘𝑊) − 1)){(𝑊‘𝑖), (𝑊‘(𝑖 + 1))} ∈ 𝐸)))
18	5, 17	bitrid 283	. . . . . 6 ⊢ ((𝑁 ∈ ℕ₀ ∧ (♯‘𝑊) = (𝑁 + 1)) → ((𝑊 ≠ ∅ ∧ 𝑊 ∈ Word 𝑉 ∧ ∀𝑖 ∈ (0..^((♯‘𝑊) − 1)){(𝑊‘𝑖), (𝑊‘(𝑖 + 1))} ∈ 𝐸) ↔ (𝑊 ∈ Word 𝑉 ∧ ∀𝑖 ∈ (0..^((♯‘𝑊) − 1)){(𝑊‘𝑖), (𝑊‘(𝑖 + 1))} ∈ 𝐸)))
19	4, 18	bitrid 283	. . . . 5 ⊢ ((𝑁 ∈ ℕ₀ ∧ (♯‘𝑊) = (𝑁 + 1)) → (𝑊 ∈ (WWalks‘𝐺) ↔ (𝑊 ∈ Word 𝑉 ∧ ∀𝑖 ∈ (0..^((♯‘𝑊) − 1)){(𝑊‘𝑖), (𝑊‘(𝑖 + 1))} ∈ 𝐸)))
20	19	ex 412	. . . 4 ⊢ (𝑁 ∈ ℕ₀ → ((♯‘𝑊) = (𝑁 + 1) → (𝑊 ∈ (WWalks‘𝐺) ↔ (𝑊 ∈ Word 𝑉 ∧ ∀𝑖 ∈ (0..^((♯‘𝑊) − 1)){(𝑊‘𝑖), (𝑊‘(𝑖 + 1))} ∈ 𝐸))))
21	20	pm5.32rd 577	. . 3 ⊢ (𝑁 ∈ ℕ₀ → ((𝑊 ∈ (WWalks‘𝐺) ∧ (♯‘𝑊) = (𝑁 + 1)) ↔ ((𝑊 ∈ Word 𝑉 ∧ ∀𝑖 ∈ (0..^((♯‘𝑊) − 1)){(𝑊‘𝑖), (𝑊‘(𝑖 + 1))} ∈ 𝐸) ∧ (♯‘𝑊) = (𝑁 + 1))))
22		df-3an 1088	. . 3 ⊢ ((𝑊 ∈ Word 𝑉 ∧ ∀𝑖 ∈ (0..^((♯‘𝑊) − 1)){(𝑊‘𝑖), (𝑊‘(𝑖 + 1))} ∈ 𝐸 ∧ (♯‘𝑊) = (𝑁 + 1)) ↔ ((𝑊 ∈ Word 𝑉 ∧ ∀𝑖 ∈ (0..^((♯‘𝑊) − 1)){(𝑊‘𝑖), (𝑊‘(𝑖 + 1))} ∈ 𝐸) ∧ (♯‘𝑊) = (𝑁 + 1)))
23	21, 22	bitr4di 289	. 2 ⊢ (𝑁 ∈ ℕ₀ → ((𝑊 ∈ (WWalks‘𝐺) ∧ (♯‘𝑊) = (𝑁 + 1)) ↔ (𝑊 ∈ Word 𝑉 ∧ ∀𝑖 ∈ (0..^((♯‘𝑊) − 1)){(𝑊‘𝑖), (𝑊‘(𝑖 + 1))} ∈ 𝐸 ∧ (♯‘𝑊) = (𝑁 + 1))))
24	1, 23	bitrd 279	1 ⊢ (𝑁 ∈ ℕ₀ → (𝑊 ∈ (𝑁 WWalksN 𝐺) ↔ (𝑊 ∈ Word 𝑉 ∧ ∀𝑖 ∈ (0..^((♯‘𝑊) − 1)){(𝑊‘𝑖), (𝑊‘(𝑖 + 1))} ∈ 𝐸 ∧ (♯‘𝑊) = (𝑁 + 1))))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ↔ wb 205 ∧ wa 395 ∧ w3a 1086 = wceq 1540 ∈ wcel 2105 ≠ wne 2939 ∀wral 3060 ∅c0 4322 {cpr 4630 ‘cfv 6543 (class class class)co 7412 0cc0 11114 1c1 11115 + caddc 11117 − cmin 11449 ℕ₀cn0 12477 ..^cfzo 13632 ♯chash 14295 Word cword 14469 Vtxcvtx 28524 Edgcedg 28575 WWalkscwwlks 29347 WWalksN cwwlksn 29348

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 1912 ax-6 1970 ax-7 2010 ax-8 2107 ax-9 2115 ax-10 2136 ax-11 2153 ax-12 2170 ax-ext 2702 ax-rep 5285 ax-sep 5299 ax-nul 5306 ax-pow 5363 ax-pr 5427 ax-un 7729 ax-cnex 11170 ax-resscn 11171 ax-1cn 11172 ax-icn 11173 ax-addcl 11174 ax-addrcl 11175 ax-mulcl 11176 ax-mulrcl 11177 ax-mulcom 11178 ax-addass 11179 ax-mulass 11180 ax-distr 11181 ax-i2m1 11182 ax-1ne0 11183 ax-1rid 11184 ax-rnegex 11185 ax-rrecex 11186 ax-cnre 11187 ax-pre-lttri 11188 ax-pre-lttrn 11189 ax-pre-ltadd 11190 ax-pre-mulgt0 11191

This theorem depends on definitions: df-bi 206 df-an 396 df-or 845 df-3or 1087 df-3an 1088 df-tru 1543 df-fal 1553 df-ex 1781 df-nf 1785 df-sb 2067 df-mo 2533 df-eu 2562 df-clab 2709 df-cleq 2723 df-clel 2809 df-nfc 2884 df-ne 2940 df-nel 3046 df-ral 3061 df-rex 3070 df-reu 3376 df-rab 3432 df-v 3475 df-sbc 3778 df-csb 3894 df-dif 3951 df-un 3953 df-in 3955 df-ss 3965 df-pss 3967 df-nul 4323 df-if 4529 df-pw 4604 df-sn 4629 df-pr 4631 df-op 4635 df-uni 4909 df-int 4951 df-iun 4999 df-br 5149 df-opab 5211 df-mpt 5232 df-tr 5266 df-id 5574 df-eprel 5580 df-po 5588 df-so 5589 df-fr 5631 df-we 5633 df-xp 5682 df-rel 5683 df-cnv 5684 df-co 5685 df-dm 5686 df-rn 5687 df-res 5688 df-ima 5689 df-pred 6300 df-ord 6367 df-on 6368 df-lim 6369 df-suc 6370 df-iota 6495 df-fun 6545 df-fn 6546 df-f 6547 df-f1 6548 df-fo 6549 df-f1o 6550 df-fv 6551 df-riota 7368 df-ov 7415 df-oprab 7416 df-mpo 7417 df-om 7860 df-1st 7979 df-2nd 7980 df-frecs 8270 df-wrecs 8301 df-recs 8375 df-rdg 8414 df-1o 8470 df-er 8707 df-map 8826 df-en 8944 df-dom 8945 df-sdom 8946 df-fin 8947 df-card 9938 df-pnf 11255 df-mnf 11256 df-xr 11257 df-ltxr 11258 df-le 11259 df-sub 11451 df-neg 11452 df-nn 12218 df-n0 12478 df-z 12564 df-uz 12828 df-fz 13490 df-fzo 13633 df-hash 14296 df-word 14470 df-wwlks 29352 df-wwlksn 29353

This theorem is referenced by: clwwlknwwlksn 29559 wwlksubclwwlk 29579

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