pthdadjvtx - Metamath Proof Explorer

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Theorem pthdadjvtx 29748

Description: The adjacent vertices of a path of length at least 2 are distinct. (Contributed by AV, 5-Feb-2021.)

**Assertion**
Ref	Expression
pthdadjvtx	⊢ ((𝐹(Paths‘𝐺)𝑃 ∧ 1 < (♯‘𝐹) ∧ 𝐼 ∈ (0..^(♯‘𝐹))) → (𝑃‘𝐼) ≠ (𝑃‘(𝐼 + 1)))

**Proof of Theorem pthdadjvtx**
Step	Hyp	Ref	Expression
1		elfzo0l 13795	. . 3 ⊢ (𝐼 ∈ (0..^(♯‘𝐹)) → (𝐼 = 0 ∨ 𝐼 ∈ (1..^(♯‘𝐹))))
2		simpr 484	. . . . . . . . 9 ⊢ ((1 < (♯‘𝐹) ∧ 𝐹(Paths‘𝐺)𝑃) → 𝐹(Paths‘𝐺)𝑃)
3		pthiswlk 29745	. . . . . . . . . . 11 ⊢ (𝐹(Paths‘𝐺)𝑃 → 𝐹(Walks‘𝐺)𝑃)
4		wlkcl 29633	. . . . . . . . . . 11 ⊢ (𝐹(Walks‘𝐺)𝑃 → (♯‘𝐹) ∈ ℕ₀)
5		1zzd 12648	. . . . . . . . . . . . . 14 ⊢ (((♯‘𝐹) ∈ ℕ₀ ∧ 1 < (♯‘𝐹)) → 1 ∈ ℤ)
6		nn0z 12638	. . . . . . . . . . . . . . 15 ⊢ ((♯‘𝐹) ∈ ℕ₀ → (♯‘𝐹) ∈ ℤ)
7	6	adantr 480	. . . . . . . . . . . . . 14 ⊢ (((♯‘𝐹) ∈ ℕ₀ ∧ 1 < (♯‘𝐹)) → (♯‘𝐹) ∈ ℤ)
8		simpr 484	. . . . . . . . . . . . . 14 ⊢ (((♯‘𝐹) ∈ ℕ₀ ∧ 1 < (♯‘𝐹)) → 1 < (♯‘𝐹))
9		fzolb 13705	. . . . . . . . . . . . . 14 ⊢ (1 ∈ (1..^(♯‘𝐹)) ↔ (1 ∈ ℤ ∧ (♯‘𝐹) ∈ ℤ ∧ 1 < (♯‘𝐹)))
10	5, 7, 8, 9	syl3anbrc 1344	. . . . . . . . . . . . 13 ⊢ (((♯‘𝐹) ∈ ℕ₀ ∧ 1 < (♯‘𝐹)) → 1 ∈ (1..^(♯‘𝐹)))
11		0elfz 13664	. . . . . . . . . . . . . 14 ⊢ ((♯‘𝐹) ∈ ℕ₀ → 0 ∈ (0...(♯‘𝐹)))
12	11	adantr 480	. . . . . . . . . . . . 13 ⊢ (((♯‘𝐹) ∈ ℕ₀ ∧ 1 < (♯‘𝐹)) → 0 ∈ (0...(♯‘𝐹)))
13		ax-1ne0 11224	. . . . . . . . . . . . . 14 ⊢ 1 ≠ 0
14	13	a1i 11	. . . . . . . . . . . . 13 ⊢ (((♯‘𝐹) ∈ ℕ₀ ∧ 1 < (♯‘𝐹)) → 1 ≠ 0)
15	10, 12, 14	3jca 1129	. . . . . . . . . . . 12 ⊢ (((♯‘𝐹) ∈ ℕ₀ ∧ 1 < (♯‘𝐹)) → (1 ∈ (1..^(♯‘𝐹)) ∧ 0 ∈ (0...(♯‘𝐹)) ∧ 1 ≠ 0))
16	15	ex 412	. . . . . . . . . . 11 ⊢ ((♯‘𝐹) ∈ ℕ₀ → (1 < (♯‘𝐹) → (1 ∈ (1..^(♯‘𝐹)) ∧ 0 ∈ (0...(♯‘𝐹)) ∧ 1 ≠ 0)))
17	3, 4, 16	3syl 18	. . . . . . . . . 10 ⊢ (𝐹(Paths‘𝐺)𝑃 → (1 < (♯‘𝐹) → (1 ∈ (1..^(♯‘𝐹)) ∧ 0 ∈ (0...(♯‘𝐹)) ∧ 1 ≠ 0)))
18	17	impcom 407	. . . . . . . . 9 ⊢ ((1 < (♯‘𝐹) ∧ 𝐹(Paths‘𝐺)𝑃) → (1 ∈ (1..^(♯‘𝐹)) ∧ 0 ∈ (0...(♯‘𝐹)) ∧ 1 ≠ 0))
19		pthdivtx 29747	. . . . . . . . 9 ⊢ ((𝐹(Paths‘𝐺)𝑃 ∧ (1 ∈ (1..^(♯‘𝐹)) ∧ 0 ∈ (0...(♯‘𝐹)) ∧ 1 ≠ 0)) → (𝑃‘1) ≠ (𝑃‘0))
20	2, 18, 19	syl2anc 584	. . . . . . . 8 ⊢ ((1 < (♯‘𝐹) ∧ 𝐹(Paths‘𝐺)𝑃) → (𝑃‘1) ≠ (𝑃‘0))
21	20	necomd 2996	. . . . . . 7 ⊢ ((1 < (♯‘𝐹) ∧ 𝐹(Paths‘𝐺)𝑃) → (𝑃‘0) ≠ (𝑃‘1))
22	21	3adant1 1131	. . . . . 6 ⊢ ((𝐼 = 0 ∧ 1 < (♯‘𝐹) ∧ 𝐹(Paths‘𝐺)𝑃) → (𝑃‘0) ≠ (𝑃‘1))
23		fveq2 6906	. . . . . . . 8 ⊢ (𝐼 = 0 → (𝑃‘𝐼) = (𝑃‘0))
24		fv0p1e1 12389	. . . . . . . 8 ⊢ (𝐼 = 0 → (𝑃‘(𝐼 + 1)) = (𝑃‘1))
25	23, 24	neeq12d 3002	. . . . . . 7 ⊢ (𝐼 = 0 → ((𝑃‘𝐼) ≠ (𝑃‘(𝐼 + 1)) ↔ (𝑃‘0) ≠ (𝑃‘1)))
26	25	3ad2ant1 1134	. . . . . 6 ⊢ ((𝐼 = 0 ∧ 1 < (♯‘𝐹) ∧ 𝐹(Paths‘𝐺)𝑃) → ((𝑃‘𝐼) ≠ (𝑃‘(𝐼 + 1)) ↔ (𝑃‘0) ≠ (𝑃‘1)))
27	22, 26	mpbird 257	. . . . 5 ⊢ ((𝐼 = 0 ∧ 1 < (♯‘𝐹) ∧ 𝐹(Paths‘𝐺)𝑃) → (𝑃‘𝐼) ≠ (𝑃‘(𝐼 + 1)))
28	27	3exp 1120	. . . 4 ⊢ (𝐼 = 0 → (1 < (♯‘𝐹) → (𝐹(Paths‘𝐺)𝑃 → (𝑃‘𝐼) ≠ (𝑃‘(𝐼 + 1)))))
29		simp3 1139	. . . . . 6 ⊢ ((𝐼 ∈ (1..^(♯‘𝐹)) ∧ 1 < (♯‘𝐹) ∧ 𝐹(Paths‘𝐺)𝑃) → 𝐹(Paths‘𝐺)𝑃)
30		id 22	. . . . . . . 8 ⊢ (𝐼 ∈ (1..^(♯‘𝐹)) → 𝐼 ∈ (1..^(♯‘𝐹)))
31		fzo0ss1 13729	. . . . . . . . . 10 ⊢ (1..^(♯‘𝐹)) ⊆ (0..^(♯‘𝐹))
32	31	sseli 3979	. . . . . . . . 9 ⊢ (𝐼 ∈ (1..^(♯‘𝐹)) → 𝐼 ∈ (0..^(♯‘𝐹)))
33		fzofzp1 13803	. . . . . . . . 9 ⊢ (𝐼 ∈ (0..^(♯‘𝐹)) → (𝐼 + 1) ∈ (0...(♯‘𝐹)))
34	32, 33	syl 17	. . . . . . . 8 ⊢ (𝐼 ∈ (1..^(♯‘𝐹)) → (𝐼 + 1) ∈ (0...(♯‘𝐹)))
35		elfzoelz 13699	. . . . . . . . . . 11 ⊢ (𝐼 ∈ (1..^(♯‘𝐹)) → 𝐼 ∈ ℤ)
36	35	zcnd 12723	. . . . . . . . . 10 ⊢ (𝐼 ∈ (1..^(♯‘𝐹)) → 𝐼 ∈ ℂ)
37		1cnd 11256	. . . . . . . . . 10 ⊢ (𝐼 ∈ (1..^(♯‘𝐹)) → 1 ∈ ℂ)
38	13	a1i 11	. . . . . . . . . 10 ⊢ (𝐼 ∈ (1..^(♯‘𝐹)) → 1 ≠ 0)
39	36, 37, 38	3jca 1129	. . . . . . . . 9 ⊢ (𝐼 ∈ (1..^(♯‘𝐹)) → (𝐼 ∈ ℂ ∧ 1 ∈ ℂ ∧ 1 ≠ 0))
40		addn0nid 11683	. . . . . . . . . 10 ⊢ ((𝐼 ∈ ℂ ∧ 1 ∈ ℂ ∧ 1 ≠ 0) → (𝐼 + 1) ≠ 𝐼)
41	40	necomd 2996	. . . . . . . . 9 ⊢ ((𝐼 ∈ ℂ ∧ 1 ∈ ℂ ∧ 1 ≠ 0) → 𝐼 ≠ (𝐼 + 1))
42	39, 41	syl 17	. . . . . . . 8 ⊢ (𝐼 ∈ (1..^(♯‘𝐹)) → 𝐼 ≠ (𝐼 + 1))
43	30, 34, 42	3jca 1129	. . . . . . 7 ⊢ (𝐼 ∈ (1..^(♯‘𝐹)) → (𝐼 ∈ (1..^(♯‘𝐹)) ∧ (𝐼 + 1) ∈ (0...(♯‘𝐹)) ∧ 𝐼 ≠ (𝐼 + 1)))
44	43	3ad2ant1 1134	. . . . . 6 ⊢ ((𝐼 ∈ (1..^(♯‘𝐹)) ∧ 1 < (♯‘𝐹) ∧ 𝐹(Paths‘𝐺)𝑃) → (𝐼 ∈ (1..^(♯‘𝐹)) ∧ (𝐼 + 1) ∈ (0...(♯‘𝐹)) ∧ 𝐼 ≠ (𝐼 + 1)))
45		pthdivtx 29747	. . . . . 6 ⊢ ((𝐹(Paths‘𝐺)𝑃 ∧ (𝐼 ∈ (1..^(♯‘𝐹)) ∧ (𝐼 + 1) ∈ (0...(♯‘𝐹)) ∧ 𝐼 ≠ (𝐼 + 1))) → (𝑃‘𝐼) ≠ (𝑃‘(𝐼 + 1)))
46	29, 44, 45	syl2anc 584	. . . . 5 ⊢ ((𝐼 ∈ (1..^(♯‘𝐹)) ∧ 1 < (♯‘𝐹) ∧ 𝐹(Paths‘𝐺)𝑃) → (𝑃‘𝐼) ≠ (𝑃‘(𝐼 + 1)))
47	46	3exp 1120	. . . 4 ⊢ (𝐼 ∈ (1..^(♯‘𝐹)) → (1 < (♯‘𝐹) → (𝐹(Paths‘𝐺)𝑃 → (𝑃‘𝐼) ≠ (𝑃‘(𝐼 + 1)))))
48	28, 47	jaoi 858	. . 3 ⊢ ((𝐼 = 0 ∨ 𝐼 ∈ (1..^(♯‘𝐹))) → (1 < (♯‘𝐹) → (𝐹(Paths‘𝐺)𝑃 → (𝑃‘𝐼) ≠ (𝑃‘(𝐼 + 1)))))
49	1, 48	syl 17	. 2 ⊢ (𝐼 ∈ (0..^(♯‘𝐹)) → (1 < (♯‘𝐹) → (𝐹(Paths‘𝐺)𝑃 → (𝑃‘𝐼) ≠ (𝑃‘(𝐼 + 1)))))
50	49	3imp31 1112	1 ⊢ ((𝐹(Paths‘𝐺)𝑃 ∧ 1 < (♯‘𝐹) ∧ 𝐼 ∈ (0..^(♯‘𝐹))) → (𝑃‘𝐼) ≠ (𝑃‘(𝐼 + 1)))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ↔ wb 206 ∧ wa 395 ∨ wo 848 ∧ w3a 1087 = wceq 1540 ∈ wcel 2108 ≠ wne 2940 class class class wbr 5143 ‘cfv 6561 (class class class)co 7431 ℂcc 11153 0cc0 11155 1c1 11156 + caddc 11158 < clt 11295 ℕ₀cn0 12526 ℤcz 12613 ...cfz 13547 ..^cfzo 13694 ♯chash 14369 Walkscwlks 29614 Pathscpths 29730

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1795 ax-4 1809 ax-5 1910 ax-6 1967 ax-7 2007 ax-8 2110 ax-9 2118 ax-10 2141 ax-11 2157 ax-12 2177 ax-ext 2708 ax-rep 5279 ax-sep 5296 ax-nul 5306 ax-pow 5365 ax-pr 5432 ax-un 7755 ax-cnex 11211 ax-resscn 11212 ax-1cn 11213 ax-icn 11214 ax-addcl 11215 ax-addrcl 11216 ax-mulcl 11217 ax-mulrcl 11218 ax-mulcom 11219 ax-addass 11220 ax-mulass 11221 ax-distr 11222 ax-i2m1 11223 ax-1ne0 11224 ax-1rid 11225 ax-rnegex 11226 ax-rrecex 11227 ax-cnre 11228 ax-pre-lttri 11229 ax-pre-lttrn 11230 ax-pre-ltadd 11231 ax-pre-mulgt0 11232

This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-ifp 1064 df-3or 1088 df-3an 1089 df-tru 1543 df-fal 1553 df-ex 1780 df-nf 1784 df-sb 2065 df-mo 2540 df-eu 2569 df-clab 2715 df-cleq 2729 df-clel 2816 df-nfc 2892 df-ne 2941 df-nel 3047 df-ral 3062 df-rex 3071 df-reu 3381 df-rab 3437 df-v 3482 df-sbc 3789 df-csb 3900 df-dif 3954 df-un 3956 df-in 3958 df-ss 3968 df-pss 3971 df-nul 4334 df-if 4526 df-pw 4602 df-sn 4627 df-pr 4629 df-op 4633 df-uni 4908 df-int 4947 df-iun 4993 df-br 5144 df-opab 5206 df-mpt 5226 df-tr 5260 df-id 5578 df-eprel 5584 df-po 5592 df-so 5593 df-fr 5637 df-we 5639 df-xp 5691 df-rel 5692 df-cnv 5693 df-co 5694 df-dm 5695 df-rn 5696 df-res 5697 df-ima 5698 df-pred 6321 df-ord 6387 df-on 6388 df-lim 6389 df-suc 6390 df-iota 6514 df-fun 6563 df-fn 6564 df-f 6565 df-f1 6566 df-fo 6567 df-f1o 6568 df-fv 6569 df-riota 7388 df-ov 7434 df-oprab 7435 df-mpo 7436 df-om 7888 df-1st 8014 df-2nd 8015 df-frecs 8306 df-wrecs 8337 df-recs 8411 df-rdg 8450 df-1o 8506 df-er 8745 df-map 8868 df-en 8986 df-dom 8987 df-sdom 8988 df-fin 8989 df-card 9979 df-pnf 11297 df-mnf 11298 df-xr 11299 df-ltxr 11300 df-le 11301 df-sub 11494 df-neg 11495 df-nn 12267 df-n0 12527 df-z 12614 df-uz 12879 df-fz 13548 df-fzo 13695 df-hash 14370 df-word 14553 df-wlks 29617 df-trls 29710 df-pths 29734

This theorem is referenced by: 2pthnloop 29751 upgr3v3e3cycl 30199 upgr4cycl4dv4e 30204

W3C validator