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Theorem spthonepeq 27527

Description: The endpoints of a simple path between two vertices are equal iff the path is of length 0. (Contributed by Alexander van der Vekens, 1-Mar-2018.) (Revised by AV, 18-Jan-2021.) (Proof shortened by AV, 31-Oct-2021.)

**Assertion**
Ref	Expression
spthonepeq	⊢ (𝐹(𝐴(SPathsOn‘𝐺)𝐵)𝑃 → (𝐴 = 𝐵 ↔ (♯‘𝐹) = 0))

**Proof of Theorem spthonepeq**
Step	Hyp	Ref	Expression
1		eqid 2821	. . 3 ⊢ (Vtx‘𝐺) = (Vtx‘𝐺)
2	1	spthonprop 27520	. 2 ⊢ (𝐹(𝐴(SPathsOn‘𝐺)𝐵)𝑃 → ((𝐺 ∈ V ∧ 𝐴 ∈ (Vtx‘𝐺) ∧ 𝐵 ∈ (Vtx‘𝐺)) ∧ (𝐹 ∈ V ∧ 𝑃 ∈ V) ∧ (𝐹(𝐴(TrailsOn‘𝐺)𝐵)𝑃 ∧ 𝐹(SPaths‘𝐺)𝑃)))
3	1	istrlson 27482	. . . . . 6 ⊢ (((𝐴 ∈ (Vtx‘𝐺) ∧ 𝐵 ∈ (Vtx‘𝐺)) ∧ (𝐹 ∈ V ∧ 𝑃 ∈ V)) → (𝐹(𝐴(TrailsOn‘𝐺)𝐵)𝑃 ↔ (𝐹(𝐴(WalksOn‘𝐺)𝐵)𝑃 ∧ 𝐹(Trails‘𝐺)𝑃)))
4	3	3adantl1 1162	. . . . 5 ⊢ (((𝐺 ∈ V ∧ 𝐴 ∈ (Vtx‘𝐺) ∧ 𝐵 ∈ (Vtx‘𝐺)) ∧ (𝐹 ∈ V ∧ 𝑃 ∈ V)) → (𝐹(𝐴(TrailsOn‘𝐺)𝐵)𝑃 ↔ (𝐹(𝐴(WalksOn‘𝐺)𝐵)𝑃 ∧ 𝐹(Trails‘𝐺)𝑃)))
5		isspth 27499	. . . . . 6 ⊢ (𝐹(SPaths‘𝐺)𝑃 ↔ (𝐹(Trails‘𝐺)𝑃 ∧ Fun ^◡𝑃))
6	5	a1i 11	. . . . 5 ⊢ (((𝐺 ∈ V ∧ 𝐴 ∈ (Vtx‘𝐺) ∧ 𝐵 ∈ (Vtx‘𝐺)) ∧ (𝐹 ∈ V ∧ 𝑃 ∈ V)) → (𝐹(SPaths‘𝐺)𝑃 ↔ (𝐹(Trails‘𝐺)𝑃 ∧ Fun ^◡𝑃)))
7	4, 6	anbi12d 632	. . . 4 ⊢ (((𝐺 ∈ V ∧ 𝐴 ∈ (Vtx‘𝐺) ∧ 𝐵 ∈ (Vtx‘𝐺)) ∧ (𝐹 ∈ V ∧ 𝑃 ∈ V)) → ((𝐹(𝐴(TrailsOn‘𝐺)𝐵)𝑃 ∧ 𝐹(SPaths‘𝐺)𝑃) ↔ ((𝐹(𝐴(WalksOn‘𝐺)𝐵)𝑃 ∧ 𝐹(Trails‘𝐺)𝑃) ∧ (𝐹(Trails‘𝐺)𝑃 ∧ Fun ^◡𝑃))))
8	1	wlkonprop 27434	. . . . . . . 8 ⊢ (𝐹(𝐴(WalksOn‘𝐺)𝐵)𝑃 → ((𝐺 ∈ V ∧ 𝐴 ∈ (Vtx‘𝐺) ∧ 𝐵 ∈ (Vtx‘𝐺)) ∧ (𝐹 ∈ V ∧ 𝑃 ∈ V) ∧ (𝐹(Walks‘𝐺)𝑃 ∧ (𝑃‘0) = 𝐴 ∧ (𝑃‘(♯‘𝐹)) = 𝐵)))
9		wlkcl 27391	. . . . . . . . . . . . 13 ⊢ (𝐹(Walks‘𝐺)𝑃 → (♯‘𝐹) ∈ ℕ₀)
10	1	wlkp 27392	. . . . . . . . . . . . 13 ⊢ (𝐹(Walks‘𝐺)𝑃 → 𝑃:(0...(♯‘𝐹))⟶(Vtx‘𝐺))
11		df-f1 6355	. . . . . . . . . . . . . . . 16 ⊢ (𝑃:(0...(♯‘𝐹))–1-1→(Vtx‘𝐺) ↔ (𝑃:(0...(♯‘𝐹))⟶(Vtx‘𝐺) ∧ Fun ^◡𝑃))
12		eqeq2 2833	. . . . . . . . . . . . . . . . . 18 ⊢ (𝐴 = 𝐵 → ((𝑃‘0) = 𝐴 ↔ (𝑃‘0) = 𝐵))
13		eqtr3 2843	. . . . . . . . . . . . . . . . . . . 20 ⊢ (((𝑃‘(♯‘𝐹)) = 𝐵 ∧ (𝑃‘0) = 𝐵) → (𝑃‘(♯‘𝐹)) = (𝑃‘0))
14		elnn0uz 12277	. . . . . . . . . . . . . . . . . . . . . . . . 25 ⊢ ((♯‘𝐹) ∈ ℕ₀ ↔ (♯‘𝐹) ∈ (ℤ_≥‘0))
15		eluzfz2 12909	. . . . . . . . . . . . . . . . . . . . . . . . 25 ⊢ ((♯‘𝐹) ∈ (ℤ_≥‘0) → (♯‘𝐹) ∈ (0...(♯‘𝐹)))
16	14, 15	sylbi 219	. . . . . . . . . . . . . . . . . . . . . . . 24 ⊢ ((♯‘𝐹) ∈ ℕ₀ → (♯‘𝐹) ∈ (0...(♯‘𝐹)))
17		0elfz 12998	. . . . . . . . . . . . . . . . . . . . . . . 24 ⊢ ((♯‘𝐹) ∈ ℕ₀ → 0 ∈ (0...(♯‘𝐹)))
18	16, 17	jca 514	. . . . . . . . . . . . . . . . . . . . . . 23 ⊢ ((♯‘𝐹) ∈ ℕ₀ → ((♯‘𝐹) ∈ (0...(♯‘𝐹)) ∧ 0 ∈ (0...(♯‘𝐹))))
19		f1veqaeq 7009	. . . . . . . . . . . . . . . . . . . . . . 23 ⊢ ((𝑃:(0...(♯‘𝐹))–1-1→(Vtx‘𝐺) ∧ ((♯‘𝐹) ∈ (0...(♯‘𝐹)) ∧ 0 ∈ (0...(♯‘𝐹)))) → ((𝑃‘(♯‘𝐹)) = (𝑃‘0) → (♯‘𝐹) = 0))
20	18, 19	sylan2 594	. . . . . . . . . . . . . . . . . . . . . 22 ⊢ ((𝑃:(0...(♯‘𝐹))–1-1→(Vtx‘𝐺) ∧ (♯‘𝐹) ∈ ℕ₀) → ((𝑃‘(♯‘𝐹)) = (𝑃‘0) → (♯‘𝐹) = 0))
21	20	ex 415	. . . . . . . . . . . . . . . . . . . . 21 ⊢ (𝑃:(0...(♯‘𝐹))–1-1→(Vtx‘𝐺) → ((♯‘𝐹) ∈ ℕ₀ → ((𝑃‘(♯‘𝐹)) = (𝑃‘0) → (♯‘𝐹) = 0)))
22	21	com13 88	. . . . . . . . . . . . . . . . . . . 20 ⊢ ((𝑃‘(♯‘𝐹)) = (𝑃‘0) → ((♯‘𝐹) ∈ ℕ₀ → (𝑃:(0...(♯‘𝐹))–1-1→(Vtx‘𝐺) → (♯‘𝐹) = 0)))
23	13, 22	syl 17	. . . . . . . . . . . . . . . . . . 19 ⊢ (((𝑃‘(♯‘𝐹)) = 𝐵 ∧ (𝑃‘0) = 𝐵) → ((♯‘𝐹) ∈ ℕ₀ → (𝑃:(0...(♯‘𝐹))–1-1→(Vtx‘𝐺) → (♯‘𝐹) = 0)))
24	23	expcom 416	. . . . . . . . . . . . . . . . . 18 ⊢ ((𝑃‘0) = 𝐵 → ((𝑃‘(♯‘𝐹)) = 𝐵 → ((♯‘𝐹) ∈ ℕ₀ → (𝑃:(0...(♯‘𝐹))–1-1→(Vtx‘𝐺) → (♯‘𝐹) = 0))))
25	12, 24	syl6bi 255	. . . . . . . . . . . . . . . . 17 ⊢ (𝐴 = 𝐵 → ((𝑃‘0) = 𝐴 → ((𝑃‘(♯‘𝐹)) = 𝐵 → ((♯‘𝐹) ∈ ℕ₀ → (𝑃:(0...(♯‘𝐹))–1-1→(Vtx‘𝐺) → (♯‘𝐹) = 0)))))
26	25	com15 101	. . . . . . . . . . . . . . . 16 ⊢ (𝑃:(0...(♯‘𝐹))–1-1→(Vtx‘𝐺) → ((𝑃‘0) = 𝐴 → ((𝑃‘(♯‘𝐹)) = 𝐵 → ((♯‘𝐹) ∈ ℕ₀ → (𝐴 = 𝐵 → (♯‘𝐹) = 0)))))
27	11, 26	sylbir 237	. . . . . . . . . . . . . . 15 ⊢ ((𝑃:(0...(♯‘𝐹))⟶(Vtx‘𝐺) ∧ Fun ^◡𝑃) → ((𝑃‘0) = 𝐴 → ((𝑃‘(♯‘𝐹)) = 𝐵 → ((♯‘𝐹) ∈ ℕ₀ → (𝐴 = 𝐵 → (♯‘𝐹) = 0)))))
28	27	expcom 416	. . . . . . . . . . . . . 14 ⊢ (Fun ^◡𝑃 → (𝑃:(0...(♯‘𝐹))⟶(Vtx‘𝐺) → ((𝑃‘0) = 𝐴 → ((𝑃‘(♯‘𝐹)) = 𝐵 → ((♯‘𝐹) ∈ ℕ₀ → (𝐴 = 𝐵 → (♯‘𝐹) = 0))))))
29	28	com15 101	. . . . . . . . . . . . 13 ⊢ ((♯‘𝐹) ∈ ℕ₀ → (𝑃:(0...(♯‘𝐹))⟶(Vtx‘𝐺) → ((𝑃‘0) = 𝐴 → ((𝑃‘(♯‘𝐹)) = 𝐵 → (Fun ^◡𝑃 → (𝐴 = 𝐵 → (♯‘𝐹) = 0))))))
30	9, 10, 29	sylc 65	. . . . . . . . . . . 12 ⊢ (𝐹(Walks‘𝐺)𝑃 → ((𝑃‘0) = 𝐴 → ((𝑃‘(♯‘𝐹)) = 𝐵 → (Fun ^◡𝑃 → (𝐴 = 𝐵 → (♯‘𝐹) = 0)))))
31	30	3imp1 1343	. . . . . . . . . . 11 ⊢ (((𝐹(Walks‘𝐺)𝑃 ∧ (𝑃‘0) = 𝐴 ∧ (𝑃‘(♯‘𝐹)) = 𝐵) ∧ Fun ^◡𝑃) → (𝐴 = 𝐵 → (♯‘𝐹) = 0))
32		fveqeq2 6674	. . . . . . . . . . . . . . . 16 ⊢ ((♯‘𝐹) = 0 → ((𝑃‘(♯‘𝐹)) = 𝐵 ↔ (𝑃‘0) = 𝐵))
33	32	anbi2d 630	. . . . . . . . . . . . . . 15 ⊢ ((♯‘𝐹) = 0 → (((𝑃‘0) = 𝐴 ∧ (𝑃‘(♯‘𝐹)) = 𝐵) ↔ ((𝑃‘0) = 𝐴 ∧ (𝑃‘0) = 𝐵)))
34		eqtr2 2842	. . . . . . . . . . . . . . 15 ⊢ (((𝑃‘0) = 𝐴 ∧ (𝑃‘0) = 𝐵) → 𝐴 = 𝐵)
35	33, 34	syl6bi 255	. . . . . . . . . . . . . 14 ⊢ ((♯‘𝐹) = 0 → (((𝑃‘0) = 𝐴 ∧ (𝑃‘(♯‘𝐹)) = 𝐵) → 𝐴 = 𝐵))
36	35	com12 32	. . . . . . . . . . . . 13 ⊢ (((𝑃‘0) = 𝐴 ∧ (𝑃‘(♯‘𝐹)) = 𝐵) → ((♯‘𝐹) = 0 → 𝐴 = 𝐵))
37	36	3adant1 1126	. . . . . . . . . . . 12 ⊢ ((𝐹(Walks‘𝐺)𝑃 ∧ (𝑃‘0) = 𝐴 ∧ (𝑃‘(♯‘𝐹)) = 𝐵) → ((♯‘𝐹) = 0 → 𝐴 = 𝐵))
38	37	adantr 483	. . . . . . . . . . 11 ⊢ (((𝐹(Walks‘𝐺)𝑃 ∧ (𝑃‘0) = 𝐴 ∧ (𝑃‘(♯‘𝐹)) = 𝐵) ∧ Fun ^◡𝑃) → ((♯‘𝐹) = 0 → 𝐴 = 𝐵))
39	31, 38	impbid 214	. . . . . . . . . 10 ⊢ (((𝐹(Walks‘𝐺)𝑃 ∧ (𝑃‘0) = 𝐴 ∧ (𝑃‘(♯‘𝐹)) = 𝐵) ∧ Fun ^◡𝑃) → (𝐴 = 𝐵 ↔ (♯‘𝐹) = 0))
40	39	ex 415	. . . . . . . . 9 ⊢ ((𝐹(Walks‘𝐺)𝑃 ∧ (𝑃‘0) = 𝐴 ∧ (𝑃‘(♯‘𝐹)) = 𝐵) → (Fun ^◡𝑃 → (𝐴 = 𝐵 ↔ (♯‘𝐹) = 0)))
41	40	3ad2ant3 1131	. . . . . . . 8 ⊢ (((𝐺 ∈ V ∧ 𝐴 ∈ (Vtx‘𝐺) ∧ 𝐵 ∈ (Vtx‘𝐺)) ∧ (𝐹 ∈ V ∧ 𝑃 ∈ V) ∧ (𝐹(Walks‘𝐺)𝑃 ∧ (𝑃‘0) = 𝐴 ∧ (𝑃‘(♯‘𝐹)) = 𝐵)) → (Fun ^◡𝑃 → (𝐴 = 𝐵 ↔ (♯‘𝐹) = 0)))
42	8, 41	syl 17	. . . . . . 7 ⊢ (𝐹(𝐴(WalksOn‘𝐺)𝐵)𝑃 → (Fun ^◡𝑃 → (𝐴 = 𝐵 ↔ (♯‘𝐹) = 0)))
43	42	adantld 493	. . . . . 6 ⊢ (𝐹(𝐴(WalksOn‘𝐺)𝐵)𝑃 → ((𝐹(Trails‘𝐺)𝑃 ∧ Fun ^◡𝑃) → (𝐴 = 𝐵 ↔ (♯‘𝐹) = 0)))
44	43	adantr 483	. . . . 5 ⊢ ((𝐹(𝐴(WalksOn‘𝐺)𝐵)𝑃 ∧ 𝐹(Trails‘𝐺)𝑃) → ((𝐹(Trails‘𝐺)𝑃 ∧ Fun ^◡𝑃) → (𝐴 = 𝐵 ↔ (♯‘𝐹) = 0)))
45	44	imp 409	. . . 4 ⊢ (((𝐹(𝐴(WalksOn‘𝐺)𝐵)𝑃 ∧ 𝐹(Trails‘𝐺)𝑃) ∧ (𝐹(Trails‘𝐺)𝑃 ∧ Fun ^◡𝑃)) → (𝐴 = 𝐵 ↔ (♯‘𝐹) = 0))
46	7, 45	syl6bi 255	. . 3 ⊢ (((𝐺 ∈ V ∧ 𝐴 ∈ (Vtx‘𝐺) ∧ 𝐵 ∈ (Vtx‘𝐺)) ∧ (𝐹 ∈ V ∧ 𝑃 ∈ V)) → ((𝐹(𝐴(TrailsOn‘𝐺)𝐵)𝑃 ∧ 𝐹(SPaths‘𝐺)𝑃) → (𝐴 = 𝐵 ↔ (♯‘𝐹) = 0)))
47	46	3impia 1113	. 2 ⊢ (((𝐺 ∈ V ∧ 𝐴 ∈ (Vtx‘𝐺) ∧ 𝐵 ∈ (Vtx‘𝐺)) ∧ (𝐹 ∈ V ∧ 𝑃 ∈ V) ∧ (𝐹(𝐴(TrailsOn‘𝐺)𝐵)𝑃 ∧ 𝐹(SPaths‘𝐺)𝑃)) → (𝐴 = 𝐵 ↔ (♯‘𝐹) = 0))
48	2, 47	syl 17	1 ⊢ (𝐹(𝐴(SPathsOn‘𝐺)𝐵)𝑃 → (𝐴 = 𝐵 ↔ (♯‘𝐹) = 0))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ↔ wb 208 ∧ wa 398 ∧ w3a 1083 = wceq 1533 ∈ wcel 2110 Vcvv 3495 class class class wbr 5059 ^◡ccnv 5549 Fun wfun 6344 ⟶wf 6346 –1-1→wf1 6347 ‘cfv 6350 (class class class)co 7150 0cc0 10531 ℕ₀cn0 11891 ℤ_≥cuz 12237 ...cfz 12886 ♯chash 13684 Vtxcvtx 26775 Walkscwlks 27372 WalksOncwlkson 27373 Trailsctrls 27466 TrailsOnctrlson 27467 SPathscspths 27488 SPathsOncspthson 27490

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1792 ax-4 1806 ax-5 1907 ax-6 1966 ax-7 2011 ax-8 2112 ax-9 2120 ax-10 2141 ax-11 2156 ax-12 2172 ax-ext 2793 ax-rep 5183 ax-sep 5196 ax-nul 5203 ax-pow 5259 ax-pr 5322 ax-un 7455 ax-cnex 10587 ax-resscn 10588 ax-1cn 10589 ax-icn 10590 ax-addcl 10591 ax-addrcl 10592 ax-mulcl 10593 ax-mulrcl 10594 ax-mulcom 10595 ax-addass 10596 ax-mulass 10597 ax-distr 10598 ax-i2m1 10599 ax-1ne0 10600 ax-1rid 10601 ax-rnegex 10602 ax-rrecex 10603 ax-cnre 10604 ax-pre-lttri 10605 ax-pre-lttrn 10606 ax-pre-ltadd 10607 ax-pre-mulgt0 10608

This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-ifp 1058 df-3or 1084 df-3an 1085 df-tru 1536 df-ex 1777 df-nf 1781 df-sb 2066 df-mo 2618 df-eu 2650 df-clab 2800 df-cleq 2814 df-clel 2893 df-nfc 2963 df-ne 3017 df-nel 3124 df-ral 3143 df-rex 3144 df-reu 3145 df-rab 3147 df-v 3497 df-sbc 3773 df-csb 3884 df-dif 3939 df-un 3941 df-in 3943 df-ss 3952 df-pss 3954 df-nul 4292 df-if 4468 df-pw 4541 df-sn 4562 df-pr 4564 df-tp 4566 df-op 4568 df-uni 4833 df-int 4870 df-iun 4914 df-br 5060 df-opab 5122 df-mpt 5140 df-tr 5166 df-id 5455 df-eprel 5460 df-po 5469 df-so 5470 df-fr 5509 df-we 5511 df-xp 5556 df-rel 5557 df-cnv 5558 df-co 5559 df-dm 5560 df-rn 5561 df-res 5562 df-ima 5563 df-pred 6143 df-ord 6189 df-on 6190 df-lim 6191 df-suc 6192 df-iota 6309 df-fun 6352 df-fn 6353 df-f 6354 df-f1 6355 df-fo 6356 df-f1o 6357 df-fv 6358 df-riota 7108 df-ov 7153 df-oprab 7154 df-mpo 7155 df-om 7575 df-1st 7683 df-2nd 7684 df-wrecs 7941 df-recs 8002 df-rdg 8040 df-1o 8096 df-oadd 8100 df-er 8283 df-map 8402 df-en 8504 df-dom 8505 df-sdom 8506 df-fin 8507 df-card 9362 df-pnf 10671 df-mnf 10672 df-xr 10673 df-ltxr 10674 df-le 10675 df-sub 10866 df-neg 10867 df-nn 11633 df-n0 11892 df-z 11976 df-uz 12238 df-fz 12887 df-fzo 13028 df-hash 13685 df-word 13856 df-wlks 27375 df-wlkson 27376 df-trls 27468 df-trlson 27469 df-pths 27491 df-spths 27492 df-spthson 27494

This theorem is referenced by: wspthsnonn0vne 27690

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