pthdadjvtx - Metamath Proof Explorer

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Theorem pthdadjvtx 29796

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 13711	. . 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 29793	. . . . . . . . . . 11 ⊢ (𝐹(Paths‘𝐺)𝑃 → 𝐹(Walks‘𝐺)𝑃)
4		wlkcl 29684	. . . . . . . . . . 11 ⊢ (𝐹(Walks‘𝐺)𝑃 → (♯‘𝐹) ∈ ℕ₀)
5		1zzd 12558	. . . . . . . . . . . . . 14 ⊢ (((♯‘𝐹) ∈ ℕ₀ ∧ 1 < (♯‘𝐹)) → 1 ∈ ℤ)
6		nn0z 12548	. . . . . . . . . . . . . . 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 13620	. . . . . . . . . . . . . 14 ⊢ (1 ∈ (1..^(♯‘𝐹)) ↔ (1 ∈ ℤ ∧ (♯‘𝐹) ∈ ℤ ∧ 1 < (♯‘𝐹)))
10	5, 7, 8, 9	syl3anbrc 1345	. . . . . . . . . . . . 13 ⊢ (((♯‘𝐹) ∈ ℕ₀ ∧ 1 < (♯‘𝐹)) → 1 ∈ (1..^(♯‘𝐹)))
11		0elfz 13578	. . . . . . . . . . . . . 14 ⊢ ((♯‘𝐹) ∈ ℕ₀ → 0 ∈ (0...(♯‘𝐹)))
12	11	adantr 480	. . . . . . . . . . . . 13 ⊢ (((♯‘𝐹) ∈ ℕ₀ ∧ 1 < (♯‘𝐹)) → 0 ∈ (0...(♯‘𝐹)))
13		ax-1ne0 11107	. . . . . . . . . . . . . 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 29795	. . . . . . . . 9 ⊢ ((𝐹(Paths‘𝐺)𝑃 ∧ (1 ∈ (1..^(♯‘𝐹)) ∧ 0 ∈ (0...(♯‘𝐹)) ∧ 1 ≠ 0)) → (𝑃‘1) ≠ (𝑃‘0))
20	2, 18, 19	syl2anc 585	. . . . . . . 8 ⊢ ((1 < (♯‘𝐹) ∧ 𝐹(Paths‘𝐺)𝑃) → (𝑃‘1) ≠ (𝑃‘0))
21	20	necomd 2987	. . . . . . 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 6840	. . . . . . . 8 ⊢ (𝐼 = 0 → (𝑃‘𝐼) = (𝑃‘0))
24		fv0p1e1 12299	. . . . . . . 8 ⊢ (𝐼 = 0 → (𝑃‘(𝐼 + 1)) = (𝑃‘1))
25	23, 24	neeq12d 2993	. . . . . . 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 13644	. . . . . . . . . 10 ⊢ (1..^(♯‘𝐹)) ⊆ (0..^(♯‘𝐹))
32	31	sseli 3917	. . . . . . . . 9 ⊢ (𝐼 ∈ (1..^(♯‘𝐹)) → 𝐼 ∈ (0..^(♯‘𝐹)))
33		fzofzp1 13719	. . . . . . . . 9 ⊢ (𝐼 ∈ (0..^(♯‘𝐹)) → (𝐼 + 1) ∈ (0...(♯‘𝐹)))
34	32, 33	syl 17	. . . . . . . 8 ⊢ (𝐼 ∈ (1..^(♯‘𝐹)) → (𝐼 + 1) ∈ (0...(♯‘𝐹)))
35		elfzoelz 13613	. . . . . . . . . . 11 ⊢ (𝐼 ∈ (1..^(♯‘𝐹)) → 𝐼 ∈ ℤ)
36	35	zcnd 12634	. . . . . . . . . 10 ⊢ (𝐼 ∈ (1..^(♯‘𝐹)) → 𝐼 ∈ ℂ)
37		1cnd 11139	. . . . . . . . . 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 11570	. . . . . . . . . 10 ⊢ ((𝐼 ∈ ℂ ∧ 1 ∈ ℂ ∧ 1 ≠ 0) → (𝐼 + 1) ≠ 𝐼)
41	40	necomd 2987	. . . . . . . . 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 29795	. . . . . 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 585	. . . . 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 1542 ∈ wcel 2114 ≠ wne 2932 class class class wbr 5085 ‘cfv 6498 (class class class)co 7367 ℂcc 11036 0cc0 11038 1c1 11039 + caddc 11041 < clt 11179 ℕ₀cn0 12437 ℤcz 12524 ...cfz 13461 ..^cfzo 13608 ♯chash 14292 Walkscwlks 29665 Pathscpths 29778

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1912 ax-6 1969 ax-7 2010 ax-8 2116 ax-9 2124 ax-10 2147 ax-11 2163 ax-12 2185 ax-ext 2708 ax-rep 5212 ax-sep 5231 ax-nul 5241 ax-pow 5307 ax-pr 5375 ax-un 7689 ax-cnex 11094 ax-resscn 11095 ax-1cn 11096 ax-icn 11097 ax-addcl 11098 ax-addrcl 11099 ax-mulcl 11100 ax-mulrcl 11101 ax-mulcom 11102 ax-addass 11103 ax-mulass 11104 ax-distr 11105 ax-i2m1 11106 ax-1ne0 11107 ax-1rid 11108 ax-rnegex 11109 ax-rrecex 11110 ax-cnre 11111 ax-pre-lttri 11112 ax-pre-lttrn 11113 ax-pre-ltadd 11114 ax-pre-mulgt0 11115

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 1545 df-fal 1555 df-ex 1782 df-nf 1786 df-sb 2069 df-mo 2539 df-eu 2569 df-clab 2715 df-cleq 2728 df-clel 2811 df-nfc 2885 df-ne 2933 df-nel 3037 df-ral 3052 df-rex 3062 df-reu 3343 df-rab 3390 df-v 3431 df-sbc 3729 df-csb 3838 df-dif 3892 df-un 3894 df-in 3896 df-ss 3906 df-pss 3909 df-nul 4274 df-if 4467 df-pw 4543 df-sn 4568 df-pr 4570 df-op 4574 df-uni 4851 df-int 4890 df-iun 4935 df-br 5086 df-opab 5148 df-mpt 5167 df-tr 5193 df-id 5526 df-eprel 5531 df-po 5539 df-so 5540 df-fr 5584 df-we 5586 df-xp 5637 df-rel 5638 df-cnv 5639 df-co 5640 df-dm 5641 df-rn 5642 df-res 5643 df-ima 5644 df-pred 6265 df-ord 6326 df-on 6327 df-lim 6328 df-suc 6329 df-iota 6454 df-fun 6500 df-fn 6501 df-f 6502 df-f1 6503 df-fo 6504 df-f1o 6505 df-fv 6506 df-riota 7324 df-ov 7370 df-oprab 7371 df-mpo 7372 df-om 7818 df-1st 7942 df-2nd 7943 df-frecs 8231 df-wrecs 8262 df-recs 8311 df-rdg 8349 df-1o 8405 df-er 8643 df-map 8775 df-en 8894 df-dom 8895 df-sdom 8896 df-fin 8897 df-card 9863 df-pnf 11181 df-mnf 11182 df-xr 11183 df-ltxr 11184 df-le 11185 df-sub 11379 df-neg 11380 df-nn 12175 df-n0 12438 df-z 12525 df-uz 12789 df-fz 13462 df-fzo 13609 df-hash 14293 df-word 14476 df-wlks 29668 df-trls 29759 df-pths 29782

This theorem is referenced by: 2pthnloop 29799 upgr3v3e3cycl 30250 upgr4cycl4dv4e 30255

W3C validator