pthdadjvtx - Metamath Proof Explorer

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Theorem pthdadjvtx 29710

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 13772	. . 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 29707	. . . . . . . . . . 11 ⊢ (𝐹(Paths‘𝐺)𝑃 → 𝐹(Walks‘𝐺)𝑃)
4		wlkcl 29595	. . . . . . . . . . 11 ⊢ (𝐹(Walks‘𝐺)𝑃 → (♯‘𝐹) ∈ ℕ₀)
5		1zzd 12623	. . . . . . . . . . . . . 14 ⊢ (((♯‘𝐹) ∈ ℕ₀ ∧ 1 < (♯‘𝐹)) → 1 ∈ ℤ)
6		nn0z 12613	. . . . . . . . . . . . . . 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 13682	. . . . . . . . . . . . . 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 13641	. . . . . . . . . . . . . 14 ⊢ ((♯‘𝐹) ∈ ℕ₀ → 0 ∈ (0...(♯‘𝐹)))
12	11	adantr 480	. . . . . . . . . . . . 13 ⊢ (((♯‘𝐹) ∈ ℕ₀ ∧ 1 < (♯‘𝐹)) → 0 ∈ (0...(♯‘𝐹)))
13		ax-1ne0 11198	. . . . . . . . . . . . . 14 ⊢ 1 ≠ 0
14	13	a1i 11	. . . . . . . . . . . . 13 ⊢ (((♯‘𝐹) ∈ ℕ₀ ∧ 1 < (♯‘𝐹)) → 1 ≠ 0)
15	10, 12, 14	3jca 1128	. . . . . . . . . . . 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 29709	. . . . . . . . 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 2987	. . . . . . 7 ⊢ ((1 < (♯‘𝐹) ∧ 𝐹(Paths‘𝐺)𝑃) → (𝑃‘0) ≠ (𝑃‘1))
22	21	3adant1 1130	. . . . . 6 ⊢ ((𝐼 = 0 ∧ 1 < (♯‘𝐹) ∧ 𝐹(Paths‘𝐺)𝑃) → (𝑃‘0) ≠ (𝑃‘1))
23		fveq2 6876	. . . . . . . 8 ⊢ (𝐼 = 0 → (𝑃‘𝐼) = (𝑃‘0))
24		fv0p1e1 12363	. . . . . . . 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 1133	. . . . . 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 1119	. . . 4 ⊢ (𝐼 = 0 → (1 < (♯‘𝐹) → (𝐹(Paths‘𝐺)𝑃 → (𝑃‘𝐼) ≠ (𝑃‘(𝐼 + 1)))))
29		simp3 1138	. . . . . 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 13706	. . . . . . . . . 10 ⊢ (1..^(♯‘𝐹)) ⊆ (0..^(♯‘𝐹))
32	31	sseli 3954	. . . . . . . . 9 ⊢ (𝐼 ∈ (1..^(♯‘𝐹)) → 𝐼 ∈ (0..^(♯‘𝐹)))
33		fzofzp1 13780	. . . . . . . . 9 ⊢ (𝐼 ∈ (0..^(♯‘𝐹)) → (𝐼 + 1) ∈ (0...(♯‘𝐹)))
34	32, 33	syl 17	. . . . . . . 8 ⊢ (𝐼 ∈ (1..^(♯‘𝐹)) → (𝐼 + 1) ∈ (0...(♯‘𝐹)))
35		elfzoelz 13676	. . . . . . . . . . 11 ⊢ (𝐼 ∈ (1..^(♯‘𝐹)) → 𝐼 ∈ ℤ)
36	35	zcnd 12698	. . . . . . . . . 10 ⊢ (𝐼 ∈ (1..^(♯‘𝐹)) → 𝐼 ∈ ℂ)
37		1cnd 11230	. . . . . . . . . 10 ⊢ (𝐼 ∈ (1..^(♯‘𝐹)) → 1 ∈ ℂ)
38	13	a1i 11	. . . . . . . . . 10 ⊢ (𝐼 ∈ (1..^(♯‘𝐹)) → 1 ≠ 0)
39	36, 37, 38	3jca 1128	. . . . . . . . 9 ⊢ (𝐼 ∈ (1..^(♯‘𝐹)) → (𝐼 ∈ ℂ ∧ 1 ∈ ℂ ∧ 1 ≠ 0))
40		addn0nid 11657	. . . . . . . . . 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 1128	. . . . . . 7 ⊢ (𝐼 ∈ (1..^(♯‘𝐹)) → (𝐼 ∈ (1..^(♯‘𝐹)) ∧ (𝐼 + 1) ∈ (0...(♯‘𝐹)) ∧ 𝐼 ≠ (𝐼 + 1)))
44	43	3ad2ant1 1133	. . . . . 6 ⊢ ((𝐼 ∈ (1..^(♯‘𝐹)) ∧ 1 < (♯‘𝐹) ∧ 𝐹(Paths‘𝐺)𝑃) → (𝐼 ∈ (1..^(♯‘𝐹)) ∧ (𝐼 + 1) ∈ (0...(♯‘𝐹)) ∧ 𝐼 ≠ (𝐼 + 1)))
45		pthdivtx 29709	. . . . . 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 1119	. . . 4 ⊢ (𝐼 ∈ (1..^(♯‘𝐹)) → (1 < (♯‘𝐹) → (𝐹(Paths‘𝐺)𝑃 → (𝑃‘𝐼) ≠ (𝑃‘(𝐼 + 1)))))
48	28, 47	jaoi 857	. . 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 1111	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 847 ∧ w3a 1086 = wceq 1540 ∈ wcel 2108 ≠ wne 2932 class class class wbr 5119 ‘cfv 6531 (class class class)co 7405 ℂcc 11127 0cc0 11129 1c1 11130 + caddc 11132 < clt 11269 ℕ₀cn0 12501 ℤcz 12588 ...cfz 13524 ..^cfzo 13671 ♯chash 14348 Walkscwlks 29576 Pathscpths 29692

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 2707 ax-rep 5249 ax-sep 5266 ax-nul 5276 ax-pow 5335 ax-pr 5402 ax-un 7729 ax-cnex 11185 ax-resscn 11186 ax-1cn 11187 ax-icn 11188 ax-addcl 11189 ax-addrcl 11190 ax-mulcl 11191 ax-mulrcl 11192 ax-mulcom 11193 ax-addass 11194 ax-mulass 11195 ax-distr 11196 ax-i2m1 11197 ax-1ne0 11198 ax-1rid 11199 ax-rnegex 11200 ax-rrecex 11201 ax-cnre 11202 ax-pre-lttri 11203 ax-pre-lttrn 11204 ax-pre-ltadd 11205 ax-pre-mulgt0 11206

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 1543 df-fal 1553 df-ex 1780 df-nf 1784 df-sb 2065 df-mo 2539 df-eu 2568 df-clab 2714 df-cleq 2727 df-clel 2809 df-nfc 2885 df-ne 2933 df-nel 3037 df-ral 3052 df-rex 3061 df-reu 3360 df-rab 3416 df-v 3461 df-sbc 3766 df-csb 3875 df-dif 3929 df-un 3931 df-in 3933 df-ss 3943 df-pss 3946 df-nul 4309 df-if 4501 df-pw 4577 df-sn 4602 df-pr 4604 df-op 4608 df-uni 4884 df-int 4923 df-iun 4969 df-br 5120 df-opab 5182 df-mpt 5202 df-tr 5230 df-id 5548 df-eprel 5553 df-po 5561 df-so 5562 df-fr 5606 df-we 5608 df-xp 5660 df-rel 5661 df-cnv 5662 df-co 5663 df-dm 5664 df-rn 5665 df-res 5666 df-ima 5667 df-pred 6290 df-ord 6355 df-on 6356 df-lim 6357 df-suc 6358 df-iota 6484 df-fun 6533 df-fn 6534 df-f 6535 df-f1 6536 df-fo 6537 df-f1o 6538 df-fv 6539 df-riota 7362 df-ov 7408 df-oprab 7409 df-mpo 7410 df-om 7862 df-1st 7988 df-2nd 7989 df-frecs 8280 df-wrecs 8311 df-recs 8385 df-rdg 8424 df-1o 8480 df-er 8719 df-map 8842 df-en 8960 df-dom 8961 df-sdom 8962 df-fin 8963 df-card 9953 df-pnf 11271 df-mnf 11272 df-xr 11273 df-ltxr 11274 df-le 11275 df-sub 11468 df-neg 11469 df-nn 12241 df-n0 12502 df-z 12589 df-uz 12853 df-fz 13525 df-fzo 13672 df-hash 14349 df-word 14532 df-wlks 29579 df-trls 29672 df-pths 29696

This theorem is referenced by: 2pthnloop 29713 upgr3v3e3cycl 30161 upgr4cycl4dv4e 30166

W3C validator