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Theorem pthhashvtx 30202

Description: A graph containing a path has at least as many vertices as there are edges in the path. (Contributed by BTernaryTau, 5-Oct-2023.)

**Hypothesis**
Ref	Expression
pthhashvtx.1	⊢ 𝑉 = (Vtx‘𝐺)

**Assertion**
Ref	Expression
pthhashvtx	⊢ (𝐹(Paths‘𝐺)𝑃 → (♯‘𝐹) ≤ (♯‘𝑉))

**Proof of Theorem pthhashvtx**
Step	Hyp	Ref	Expression
1		hashfz0 14501	. . . 4 ⊢ (((♯‘𝐹) − 1) ∈ ℕ₀ → (♯‘(0...((♯‘𝐹) − 1))) = (((♯‘𝐹) − 1) + 1))
2		pthiswlk 30197	. . . . . 6 ⊢ (𝐹(Paths‘𝐺)𝑃 → 𝐹(Walks‘𝐺)𝑃)
3		wlkcl 30083	. . . . . 6 ⊢ (𝐹(Walks‘𝐺)𝑃 → (♯‘𝐹) ∈ ℕ₀)
4	2, 3	syl 18	. . . . 5 ⊢ (𝐹(Paths‘𝐺)𝑃 → (♯‘𝐹) ∈ ℕ₀)
5		nn0cn 12542	. . . . 5 ⊢ ((♯‘𝐹) ∈ ℕ₀ → (♯‘𝐹) ∈ ℂ)
6		npcan1 11667	. . . . 5 ⊢ ((♯‘𝐹) ∈ ℂ → (((♯‘𝐹) − 1) + 1) = (♯‘𝐹))
7	4, 5, 6	3syl 19	. . . 4 ⊢ (𝐹(Paths‘𝐺)𝑃 → (((♯‘𝐹) − 1) + 1) = (♯‘𝐹))
8	1, 7	sylan9eqr 2819	. . 3 ⊢ ((𝐹(Paths‘𝐺)𝑃 ∧ ((♯‘𝐹) − 1) ∈ ℕ₀) → (♯‘(0...((♯‘𝐹) − 1))) = (♯‘𝐹))
9		pthhashvtx.1	. . . . . . . 8 ⊢ 𝑉 = (Vtx‘𝐺)
10	9	wlkp 30084	. . . . . . 7 ⊢ (𝐹(Walks‘𝐺)𝑃 → 𝑃:(0...(♯‘𝐹))⟶𝑉)
11	2, 10	syl 18	. . . . . 6 ⊢ (𝐹(Paths‘𝐺)𝑃 → 𝑃:(0...(♯‘𝐹))⟶𝑉)
12	11	ffnd 6707	. . . . 5 ⊢ (𝐹(Paths‘𝐺)𝑃 → 𝑃 Fn (0...(♯‘𝐹)))
13		fzfi 14040	. . . . 5 ⊢ (0...((♯‘𝐹) − 1)) ∈ Fin
14		resfnfinfin 9308	. . . . 5 ⊢ ((𝑃 Fn (0...(♯‘𝐹)) ∧ (0...((♯‘𝐹) − 1)) ∈ Fin) → (𝑃 ↾ (0...((♯‘𝐹) − 1))) ∈ Fin)
15	12, 13, 14	sylancl 598	. . . 4 ⊢ (𝐹(Paths‘𝐺)𝑃 → (𝑃 ↾ (0...((♯‘𝐹) − 1))) ∈ Fin)
16		simpr 490	. . . . 5 ⊢ ((𝐹(Paths‘𝐺)𝑃 ∧ ((♯‘𝐹) − 1) ∈ ℕ₀) → ((♯‘𝐹) − 1) ∈ ℕ₀)
17		fzssp1 13626	. . . . . . . 8 ⊢ (0...((♯‘𝐹) − 1)) ⊆ (0...(((♯‘𝐹) − 1) + 1))
18	7	oveq2d 7433	. . . . . . . 8 ⊢ (𝐹(Paths‘𝐺)𝑃 → (0...(((♯‘𝐹) − 1) + 1)) = (0...(♯‘𝐹)))
19	17, 18	sseqtrid 3976	. . . . . . 7 ⊢ (𝐹(Paths‘𝐺)𝑃 → (0...((♯‘𝐹) − 1)) ⊆ (0...(♯‘𝐹)))
20	11, 19	fssresd 6746	. . . . . 6 ⊢ (𝐹(Paths‘𝐺)𝑃 → (𝑃 ↾ (0...((♯‘𝐹) − 1))):(0...((♯‘𝐹) − 1))⟶𝑉)
21	20	adantr 486	. . . . 5 ⊢ ((𝐹(Paths‘𝐺)𝑃 ∧ ((♯‘𝐹) − 1) ∈ ℕ₀) → (𝑃 ↾ (0...((♯‘𝐹) − 1))):(0...((♯‘𝐹) − 1))⟶𝑉)
22		fz1ssfz0 13682	. . . . . . . . . 10 ⊢ (1...((♯‘𝐹) − 1)) ⊆ (0...((♯‘𝐹) − 1))
23	22	a1i 11	. . . . . . . . 9 ⊢ (𝐹(Paths‘𝐺)𝑃 → (1...((♯‘𝐹) − 1)) ⊆ (0...((♯‘𝐹) − 1)))
24	20, 23	fssresd 6746	. . . . . . . 8 ⊢ (𝐹(Paths‘𝐺)𝑃 → ((𝑃 ↾ (0...((♯‘𝐹) − 1))) ↾ (1...((♯‘𝐹) − 1))):(1...((♯‘𝐹) − 1))⟶𝑉)
25		ispth 30193	. . . . . . . . . 10 ⊢ (𝐹(Paths‘𝐺)𝑃 ↔ (𝐹(Trails‘𝐺)𝑃 ∧ Fun ^◡(𝑃 ↾ (1..^(♯‘𝐹))) ∧ ((𝑃 “ {0, (♯‘𝐹)}) ∩ (𝑃 “ (1..^(♯‘𝐹)))) = ∅))
26	25	simp2bi 1164	. . . . . . . . 9 ⊢ (𝐹(Paths‘𝐺)𝑃 → Fun ^◡(𝑃 ↾ (1..^(♯‘𝐹))))
27		nn0z 12643	. . . . . . . . . . . . . . 15 ⊢ ((♯‘𝐹) ∈ ℕ₀ → (♯‘𝐹) ∈ ℤ)
28		fzoval 13719	. . . . . . . . . . . . . . 15 ⊢ ((♯‘𝐹) ∈ ℤ → (1..^(♯‘𝐹)) = (1...((♯‘𝐹) − 1)))
29	27, 28	syl 18	. . . . . . . . . . . . . 14 ⊢ ((♯‘𝐹) ∈ ℕ₀ → (1..^(♯‘𝐹)) = (1...((♯‘𝐹) − 1)))
30	4, 29	syl 18	. . . . . . . . . . . . 13 ⊢ (𝐹(Paths‘𝐺)𝑃 → (1..^(♯‘𝐹)) = (1...((♯‘𝐹) − 1)))
31	30	reseq2d 5976	. . . . . . . . . . . 12 ⊢ (𝐹(Paths‘𝐺)𝑃 → (𝑃 ↾ (1..^(♯‘𝐹))) = (𝑃 ↾ (1...((♯‘𝐹) − 1))))
32		resabs1 6003	. . . . . . . . . . . . 13 ⊢ ((1...((♯‘𝐹) − 1)) ⊆ (0...((♯‘𝐹) − 1)) → ((𝑃 ↾ (0...((♯‘𝐹) − 1))) ↾ (1...((♯‘𝐹) − 1))) = (𝑃 ↾ (1...((♯‘𝐹) − 1))))
33	22, 32	ax-mp 5	. . . . . . . . . . . 12 ⊢ ((𝑃 ↾ (0...((♯‘𝐹) − 1))) ↾ (1...((♯‘𝐹) − 1))) = (𝑃 ↾ (1...((♯‘𝐹) − 1)))
34	31, 33	eqtr4di 2815	. . . . . . . . . . 11 ⊢ (𝐹(Paths‘𝐺)𝑃 → (𝑃 ↾ (1..^(♯‘𝐹))) = ((𝑃 ↾ (0...((♯‘𝐹) − 1))) ↾ (1...((♯‘𝐹) − 1))))
35	34	cnveqd 5859	. . . . . . . . . 10 ⊢ (𝐹(Paths‘𝐺)𝑃 → ^◡(𝑃 ↾ (1..^(♯‘𝐹))) = ^◡((𝑃 ↾ (0...((♯‘𝐹) − 1))) ↾ (1...((♯‘𝐹) − 1))))
36	35	funeqd 6559	. . . . . . . . 9 ⊢ (𝐹(Paths‘𝐺)𝑃 → (Fun ^◡(𝑃 ↾ (1..^(♯‘𝐹))) ↔ Fun ^◡((𝑃 ↾ (0...((♯‘𝐹) − 1))) ↾ (1...((♯‘𝐹) − 1)))))
37	26, 36	mpbid 235	. . . . . . . 8 ⊢ (𝐹(Paths‘𝐺)𝑃 → Fun ^◡((𝑃 ↾ (0...((♯‘𝐹) − 1))) ↾ (1...((♯‘𝐹) − 1))))
38		df-f1 6542	. . . . . . . 8 ⊢ (((𝑃 ↾ (0...((♯‘𝐹) − 1))) ↾ (1...((♯‘𝐹) − 1))):(1...((♯‘𝐹) − 1))–1-1→𝑉 ↔ (((𝑃 ↾ (0...((♯‘𝐹) − 1))) ↾ (1...((♯‘𝐹) − 1))):(1...((♯‘𝐹) − 1))⟶𝑉 ∧ Fun ^◡((𝑃 ↾ (0...((♯‘𝐹) − 1))) ↾ (1...((♯‘𝐹) − 1)))))
39	24, 37, 38	sylanbrc 595	. . . . . . 7 ⊢ (𝐹(Paths‘𝐺)𝑃 → ((𝑃 ↾ (0...((♯‘𝐹) − 1))) ↾ (1...((♯‘𝐹) − 1))):(1...((♯‘𝐹) − 1))–1-1→𝑉)
40	39	adantr 486	. . . . . 6 ⊢ ((𝐹(Paths‘𝐺)𝑃 ∧ ((♯‘𝐹) − 1) ∈ ℕ₀) → ((𝑃 ↾ (0...((♯‘𝐹) − 1))) ↾ (1...((♯‘𝐹) − 1))):(1...((♯‘𝐹) − 1))–1-1→𝑉)
41	38	simprbi 503	. . . . . 6 ⊢ (((𝑃 ↾ (0...((♯‘𝐹) − 1))) ↾ (1...((♯‘𝐹) − 1))):(1...((♯‘𝐹) − 1))–1-1→𝑉 → Fun ^◡((𝑃 ↾ (0...((♯‘𝐹) − 1))) ↾ (1...((♯‘𝐹) − 1))))
42	40, 41	syl 18	. . . . 5 ⊢ ((𝐹(Paths‘𝐺)𝑃 ∧ ((♯‘𝐹) − 1) ∈ ℕ₀) → Fun ^◡((𝑃 ↾ (0...((♯‘𝐹) − 1))) ↾ (1...((♯‘𝐹) − 1))))
43		snsspr1 4778	. . . . . . . 8 ⊢ {0} ⊆ {0, (♯‘𝐹)}
44		imass2 6102	. . . . . . . 8 ⊢ ({0} ⊆ {0, (♯‘𝐹)} → (𝑃 “ {0}) ⊆ (𝑃 “ {0, (♯‘𝐹)}))
45	43, 44	ax-mp 5	. . . . . . 7 ⊢ (𝑃 “ {0}) ⊆ (𝑃 “ {0, (♯‘𝐹)})
46		0elfz 13683	. . . . . . . . 9 ⊢ (((♯‘𝐹) − 1) ∈ ℕ₀ → 0 ∈ (0...((♯‘𝐹) − 1)))
47	46	snssd 4750	. . . . . . . 8 ⊢ (((♯‘𝐹) − 1) ∈ ℕ₀ → {0} ⊆ (0...((♯‘𝐹) − 1)))
48		resima2 6013	. . . . . . . 8 ⊢ ({0} ⊆ (0...((♯‘𝐹) − 1)) → ((𝑃 ↾ (0...((♯‘𝐹) − 1))) “ {0}) = (𝑃 “ {0}))
49		sseq1 3959	. . . . . . . 8 ⊢ (((𝑃 ↾ (0...((♯‘𝐹) − 1))) “ {0}) = (𝑃 “ {0}) → (((𝑃 ↾ (0...((♯‘𝐹) − 1))) “ {0}) ⊆ (𝑃 “ {0, (♯‘𝐹)}) ↔ (𝑃 “ {0}) ⊆ (𝑃 “ {0, (♯‘𝐹)})))
50	47, 48, 49	3syl 19	. . . . . . 7 ⊢ (((♯‘𝐹) − 1) ∈ ℕ₀ → (((𝑃 ↾ (0...((♯‘𝐹) − 1))) “ {0}) ⊆ (𝑃 “ {0, (♯‘𝐹)}) ↔ (𝑃 “ {0}) ⊆ (𝑃 “ {0, (♯‘𝐹)})))
51	45, 50	mpbiri 261	. . . . . 6 ⊢ (((♯‘𝐹) − 1) ∈ ℕ₀ → ((𝑃 ↾ (0...((♯‘𝐹) − 1))) “ {0}) ⊆ (𝑃 “ {0, (♯‘𝐹)}))
52		resima2 6013	. . . . . . . . . 10 ⊢ ((1...((♯‘𝐹) − 1)) ⊆ (0...((♯‘𝐹) − 1)) → ((𝑃 ↾ (0...((♯‘𝐹) − 1))) “ (1...((♯‘𝐹) − 1))) = (𝑃 “ (1...((♯‘𝐹) − 1))))
53	22, 52	ax-mp 5	. . . . . . . . 9 ⊢ ((𝑃 ↾ (0...((♯‘𝐹) − 1))) “ (1...((♯‘𝐹) − 1))) = (𝑃 “ (1...((♯‘𝐹) − 1)))
54	30	imaeq2d 6060	. . . . . . . . 9 ⊢ (𝐹(Paths‘𝐺)𝑃 → (𝑃 “ (1..^(♯‘𝐹))) = (𝑃 “ (1...((♯‘𝐹) − 1))))
55	53, 54	eqtr4id 2816	. . . . . . . 8 ⊢ (𝐹(Paths‘𝐺)𝑃 → ((𝑃 ↾ (0...((♯‘𝐹) − 1))) “ (1...((♯‘𝐹) − 1))) = (𝑃 “ (1..^(♯‘𝐹))))
56	55	ineq2d 4169	. . . . . . 7 ⊢ (𝐹(Paths‘𝐺)𝑃 → ((𝑃 “ {0, (♯‘𝐹)}) ∩ ((𝑃 ↾ (0...((♯‘𝐹) − 1))) “ (1...((♯‘𝐹) − 1)))) = ((𝑃 “ {0, (♯‘𝐹)}) ∩ (𝑃 “ (1..^(♯‘𝐹)))))
57	25	simp3bi 1165	. . . . . . 7 ⊢ (𝐹(Paths‘𝐺)𝑃 → ((𝑃 “ {0, (♯‘𝐹)}) ∩ (𝑃 “ (1..^(♯‘𝐹)))) = ∅)
58	56, 57	eqtrd 2797	. . . . . 6 ⊢ (𝐹(Paths‘𝐺)𝑃 → ((𝑃 “ {0, (♯‘𝐹)}) ∩ ((𝑃 ↾ (0...((♯‘𝐹) − 1))) “ (1...((♯‘𝐹) − 1)))) = ∅)
59		ssdisj 4416	. . . . . 6 ⊢ ((((𝑃 ↾ (0...((♯‘𝐹) − 1))) “ {0}) ⊆ (𝑃 “ {0, (♯‘𝐹)}) ∧ ((𝑃 “ {0, (♯‘𝐹)}) ∩ ((𝑃 ↾ (0...((♯‘𝐹) − 1))) “ (1...((♯‘𝐹) − 1)))) = ∅) → (((𝑃 ↾ (0...((♯‘𝐹) − 1))) “ {0}) ∩ ((𝑃 ↾ (0...((♯‘𝐹) − 1))) “ (1...((♯‘𝐹) − 1)))) = ∅)
60	51, 58, 59	syl2anr 609	. . . . 5 ⊢ ((𝐹(Paths‘𝐺)𝑃 ∧ ((♯‘𝐹) − 1) ∈ ℕ₀) → (((𝑃 ↾ (0...((♯‘𝐹) − 1))) “ {0}) ∩ ((𝑃 ↾ (0...((♯‘𝐹) − 1))) “ (1...((♯‘𝐹) − 1)))) = ∅)
61	16, 21, 42, 60	f1resfz0f1d 13852	. . . 4 ⊢ ((𝐹(Paths‘𝐺)𝑃 ∧ ((♯‘𝐹) − 1) ∈ ℕ₀) → (𝑃 ↾ (0...((♯‘𝐹) − 1))):(0...((♯‘𝐹) − 1))–1-1→𝑉)
62	9	fvexi 6896	. . . . 5 ⊢ 𝑉 ∈ V
63		hashf1dmcdm 14513	. . . . 5 ⊢ (((𝑃 ↾ (0...((♯‘𝐹) − 1))) ∈ Fin ∧ 𝑉 ∈ V ∧ (𝑃 ↾ (0...((♯‘𝐹) − 1))):(0...((♯‘𝐹) − 1))–1-1→𝑉) → (♯‘(0...((♯‘𝐹) − 1))) ≤ (♯‘𝑉))
64	62, 63	mp3an2 1478	. . . 4 ⊢ (((𝑃 ↾ (0...((♯‘𝐹) − 1))) ∈ Fin ∧ (𝑃 ↾ (0...((♯‘𝐹) − 1))):(0...((♯‘𝐹) − 1))–1-1→𝑉) → (♯‘(0...((♯‘𝐹) − 1))) ≤ (♯‘𝑉))
65	15, 61, 64	syl2an2r 698	. . 3 ⊢ ((𝐹(Paths‘𝐺)𝑃 ∧ ((♯‘𝐹) − 1) ∈ ℕ₀) → (♯‘(0...((♯‘𝐹) − 1))) ≤ (♯‘𝑉))
66	8, 65	eqbrtrrd 5133	. 2 ⊢ ((𝐹(Paths‘𝐺)𝑃 ∧ ((♯‘𝐹) − 1) ∈ ℕ₀) → (♯‘𝐹) ≤ (♯‘𝑉))
67		0nn0m1nnn0 12679	. . . . 5 ⊢ ((♯‘𝐹) = 0 ↔ ((♯‘𝐹) ∈ ℕ₀ ∧ ¬ ((♯‘𝐹) − 1) ∈ ℕ₀))
68	67	biimpri 231	. . . 4 ⊢ (((♯‘𝐹) ∈ ℕ₀ ∧ ¬ ((♯‘𝐹) − 1) ∈ ℕ₀) → (♯‘𝐹) = 0)
69	4, 68	sylan 592	. . 3 ⊢ ((𝐹(Paths‘𝐺)𝑃 ∧ ¬ ((♯‘𝐹) − 1) ∈ ℕ₀) → (♯‘𝐹) = 0)
70		hashge0 14455	. . . 4 ⊢ (𝑉 ∈ V → 0 ≤ (♯‘𝑉))
71	62, 70	ax-mp 5	. . 3 ⊢ 0 ≤ (♯‘𝑉)
72	69, 71	eqbrtrdi 5148	. 2 ⊢ ((𝐹(Paths‘𝐺)𝑃 ∧ ¬ ((♯‘𝐹) − 1) ∈ ℕ₀) → (♯‘𝐹) ≤ (♯‘𝑉))
73	66, 72	pm2.61dan 825	1 ⊢ (𝐹(Paths‘𝐺)𝑃 → (♯‘𝐹) ≤ (♯‘𝑉))

Colors of variables: wff setvar class

This proof depends on syntax axioms: ¬ wn 3 → wi 4 ↔ wb 209 ∧ wa 401 = wceq 1570 ∈ wcel 2145 Vcvv 3453 ∩ cin 3901 ⊆ wss 3902 ∅c0 4282 {csn 4587 {cpr 4589 class class class wbr 5107 ^◡ccnv 5658 ↾ cres 5661 “ cima 5662 Fun wfun 6531 Fn wfn 6532 ⟶wf 6533 –1-1→wf1 6534 ‘cfv 6537 (class class class)co 7417 Fincfn 8956 ℂcc 11126 0cc0 11128 1c1 11129 + caddc 11131 ≤ cle 11272 − cmin 11469 ℕ₀cn0 12532 ℤcz 12619 ...cfz 13565 ..^cfzo 13713 ♯chash 14398 Vtxcvtx 29461 Walkscwlks 30064 Trailsctrls 30160 Pathscpths 30182

This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1943 ax-6 2000 ax-7 2041 ax-8 2147 ax-9 2155 ax-10 2178 ax-11 2194 ax-12 2215 ax-ext 2734 ax-rep 5236 ax-sep 5255 ax-nul 5267 ax-pow 5334 ax-pr 5402 ax-un 7740 ax-cnex 11184 ax-resscn 11185 ax-1cn 11186 ax-icn 11187 ax-addcl 11188 ax-addrcl 11189 ax-mulcl 11190 ax-mulrcl 11191 ax-mulcom 11192 ax-addass 11193 ax-mulass 11194 ax-distr 11195 ax-i2m1 11196 ax-1ne0 11197 ax-1rid 11198 ax-rnegex 11199 ax-rrecex 11200 ax-cnre 11201 ax-pre-lttri 11202 ax-pre-lttrn 11203 ax-pre-ltadd 11204 ax-pre-mulgt0 11205

This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-ifp 1079 df-3or 1104 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-nf 1817 df-sb 2100 df-mo 2566 df-eu 2596 df-clab 2741 df-cleq 2754 df-clel 2837 df-nfc 2911 df-ne 2958 df-nel 3064 df-ral 3079 df-rex 3089 df-reu 3368 df-rab 3415 df-v 3455 df-sbc 3743 df-csb 3851 df-dif 3905 df-un 3907 df-in 3909 df-ss 3919 df-pss 3922 df-nul 4283 df-if 4486 df-pw 4562 df-sn 4588 df-pr 4590 df-op 4594 df-uni 4871 df-int 4911 df-iun 4956 df-br 5108 df-opab 5172 df-mpt 5191 df-tr 5217 df-id 5554 df-eprel 5559 df-po 5567 df-so 5568 df-fr 5612 df-we 5614 df-xp 5665 df-rel 5666 df-cnv 5667 df-co 5668 df-dm 5669 df-rn 5670 df-res 5671 df-ima 5672 df-pred 6303 df-ord 6364 df-on 6365 df-lim 6366 df-suc 6367 df-iota 6493 df-fun 6539 df-fn 6540 df-f 6541 df-f1 6542 df-fo 6543 df-f1o 6544 df-fv 6545 df-riota 7374 df-ov 7420 df-oprab 7421 df-mpo 7422 df-om 7867 df-1st 7990 df-2nd 7991 df-frecs 8284 df-wrecs 8315 df-recs 8364 df-rdg 8403 df-1o 8459 df-2o 8460 df-oadd 8463 df-er 8700 df-map 8832 df-en 8957 df-dom 8958 df-sdom 8959 df-fin 8960 df-dju 9910 df-card 9948 df-pnf 11273 df-mnf 11274 df-xr 11275 df-ltxr 11276 df-le 11277 df-sub 11471 df-neg 11472 df-nn 12262 df-2 12331 df-n0 12533 df-xnn0 12606 df-z 12620 df-uz 12892 df-fz 13566 df-fzo 13714 df-hash 14399 df-word 14583 df-wlks 30067 df-trls 30162 df-pths 30186

This theorem is used by: usgrcyclgt2v 35732 acycgr1v 35736

W3C validator