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Theorem 3spthd 29294

Description: A simple path of length 3 from one vertex to another, different vertex via a third vertex. (Contributed by AV, 10-Feb-2021.) (Revised by AV, 24-Mar-2021.) (Proof shortened by AV, 30-Oct-2021.)

**Hypotheses**
Ref	Expression
3wlkd.p	⊢ 𝑃 = ⟨“𝐴𝐵𝐶𝐷”⟩
3wlkd.f	⊢ 𝐹 = ⟨“𝐽𝐾𝐿”⟩
3wlkd.s	⊢ (𝜑 → ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑉) ∧ (𝐶 ∈ 𝑉 ∧ 𝐷 ∈ 𝑉)))
3wlkd.n	⊢ (𝜑 → ((𝐴 ≠ 𝐵 ∧ 𝐴 ≠ 𝐶) ∧ (𝐵 ≠ 𝐶 ∧ 𝐵 ≠ 𝐷) ∧ 𝐶 ≠ 𝐷))
3wlkd.e	⊢ (𝜑 → ({𝐴, 𝐵} ⊆ (𝐼‘𝐽) ∧ {𝐵, 𝐶} ⊆ (𝐼‘𝐾) ∧ {𝐶, 𝐷} ⊆ (𝐼‘𝐿)))
3wlkd.v	⊢ 𝑉 = (Vtx‘𝐺)
3wlkd.i	⊢ 𝐼 = (iEdg‘𝐺)
3trld.n	⊢ (𝜑 → (𝐽 ≠ 𝐾 ∧ 𝐽 ≠ 𝐿 ∧ 𝐾 ≠ 𝐿))
3spthd.n	⊢ (𝜑 → 𝐴 ≠ 𝐷)

**Assertion**
Ref	Expression
3spthd	⊢ (𝜑 → 𝐹(SPaths‘𝐺)𝑃)

**Proof of Theorem 3spthd**
Step	Hyp	Ref	Expression
1		3wlkd.p	. . 3 ⊢ 𝑃 = ⟨“𝐴𝐵𝐶𝐷”⟩
2		3wlkd.f	. . 3 ⊢ 𝐹 = ⟨“𝐽𝐾𝐿”⟩
3		3wlkd.s	. . 3 ⊢ (𝜑 → ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑉) ∧ (𝐶 ∈ 𝑉 ∧ 𝐷 ∈ 𝑉)))
4		3wlkd.n	. . 3 ⊢ (𝜑 → ((𝐴 ≠ 𝐵 ∧ 𝐴 ≠ 𝐶) ∧ (𝐵 ≠ 𝐶 ∧ 𝐵 ≠ 𝐷) ∧ 𝐶 ≠ 𝐷))
5		3wlkd.e	. . 3 ⊢ (𝜑 → ({𝐴, 𝐵} ⊆ (𝐼‘𝐽) ∧ {𝐵, 𝐶} ⊆ (𝐼‘𝐾) ∧ {𝐶, 𝐷} ⊆ (𝐼‘𝐿)))
6		3wlkd.v	. . 3 ⊢ 𝑉 = (Vtx‘𝐺)
7		3wlkd.i	. . 3 ⊢ 𝐼 = (iEdg‘𝐺)
8		3trld.n	. . 3 ⊢ (𝜑 → (𝐽 ≠ 𝐾 ∧ 𝐽 ≠ 𝐿 ∧ 𝐾 ≠ 𝐿))
9	1, 2, 3, 4, 5, 6, 7, 8	3trld 29290	. 2 ⊢ (𝜑 → 𝐹(Trails‘𝐺)𝑃)
10		simpr 485	. . 3 ⊢ ((𝜑 ∧ 𝐹(Trails‘𝐺)𝑃) → 𝐹(Trails‘𝐺)𝑃)
11		3spthd.n	. . . . . . . . 9 ⊢ (𝜑 → 𝐴 ≠ 𝐷)
12		df-3an 1089	. . . . . . . . . . 11 ⊢ ((𝐴 ≠ 𝐵 ∧ 𝐴 ≠ 𝐶 ∧ 𝐴 ≠ 𝐷) ↔ ((𝐴 ≠ 𝐵 ∧ 𝐴 ≠ 𝐶) ∧ 𝐴 ≠ 𝐷))
13	12	simplbi2 501	. . . . . . . . . 10 ⊢ ((𝐴 ≠ 𝐵 ∧ 𝐴 ≠ 𝐶) → (𝐴 ≠ 𝐷 → (𝐴 ≠ 𝐵 ∧ 𝐴 ≠ 𝐶 ∧ 𝐴 ≠ 𝐷)))
14	13	3ad2ant1 1133	. . . . . . . . 9 ⊢ (((𝐴 ≠ 𝐵 ∧ 𝐴 ≠ 𝐶) ∧ (𝐵 ≠ 𝐶 ∧ 𝐵 ≠ 𝐷) ∧ 𝐶 ≠ 𝐷) → (𝐴 ≠ 𝐷 → (𝐴 ≠ 𝐵 ∧ 𝐴 ≠ 𝐶 ∧ 𝐴 ≠ 𝐷)))
15	11, 14	mpan9 507	. . . . . . . 8 ⊢ ((𝜑 ∧ ((𝐴 ≠ 𝐵 ∧ 𝐴 ≠ 𝐶) ∧ (𝐵 ≠ 𝐶 ∧ 𝐵 ≠ 𝐷) ∧ 𝐶 ≠ 𝐷)) → (𝐴 ≠ 𝐵 ∧ 𝐴 ≠ 𝐶 ∧ 𝐴 ≠ 𝐷))
16		simpr2 1195	. . . . . . . 8 ⊢ ((𝜑 ∧ ((𝐴 ≠ 𝐵 ∧ 𝐴 ≠ 𝐶) ∧ (𝐵 ≠ 𝐶 ∧ 𝐵 ≠ 𝐷) ∧ 𝐶 ≠ 𝐷)) → (𝐵 ≠ 𝐶 ∧ 𝐵 ≠ 𝐷))
17		simpr3 1196	. . . . . . . 8 ⊢ ((𝜑 ∧ ((𝐴 ≠ 𝐵 ∧ 𝐴 ≠ 𝐶) ∧ (𝐵 ≠ 𝐶 ∧ 𝐵 ≠ 𝐷) ∧ 𝐶 ≠ 𝐷)) → 𝐶 ≠ 𝐷)
18	15, 16, 17	3jca 1128	. . . . . . 7 ⊢ ((𝜑 ∧ ((𝐴 ≠ 𝐵 ∧ 𝐴 ≠ 𝐶) ∧ (𝐵 ≠ 𝐶 ∧ 𝐵 ≠ 𝐷) ∧ 𝐶 ≠ 𝐷)) → ((𝐴 ≠ 𝐵 ∧ 𝐴 ≠ 𝐶 ∧ 𝐴 ≠ 𝐷) ∧ (𝐵 ≠ 𝐶 ∧ 𝐵 ≠ 𝐷) ∧ 𝐶 ≠ 𝐷))
19	4, 18	mpdan 685	. . . . . 6 ⊢ (𝜑 → ((𝐴 ≠ 𝐵 ∧ 𝐴 ≠ 𝐶 ∧ 𝐴 ≠ 𝐷) ∧ (𝐵 ≠ 𝐶 ∧ 𝐵 ≠ 𝐷) ∧ 𝐶 ≠ 𝐷))
20		funcnvs4 14848	. . . . . 6 ⊢ ((((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑉) ∧ (𝐶 ∈ 𝑉 ∧ 𝐷 ∈ 𝑉)) ∧ ((𝐴 ≠ 𝐵 ∧ 𝐴 ≠ 𝐶 ∧ 𝐴 ≠ 𝐷) ∧ (𝐵 ≠ 𝐶 ∧ 𝐵 ≠ 𝐷) ∧ 𝐶 ≠ 𝐷)) → Fun ^◡⟨“𝐴𝐵𝐶𝐷”⟩)
21	3, 19, 20	syl2anc 584	. . . . 5 ⊢ (𝜑 → Fun ^◡⟨“𝐴𝐵𝐶𝐷”⟩)
22	21	adantr 481	. . . 4 ⊢ ((𝜑 ∧ 𝐹(Trails‘𝐺)𝑃) → Fun ^◡⟨“𝐴𝐵𝐶𝐷”⟩)
23	1	a1i 11	. . . . . 6 ⊢ ((𝜑 ∧ 𝐹(Trails‘𝐺)𝑃) → 𝑃 = ⟨“𝐴𝐵𝐶𝐷”⟩)
24	23	cnveqd 5867	. . . . 5 ⊢ ((𝜑 ∧ 𝐹(Trails‘𝐺)𝑃) → ^◡𝑃 = ^◡⟨“𝐴𝐵𝐶𝐷”⟩)
25	24	funeqd 6559	. . . 4 ⊢ ((𝜑 ∧ 𝐹(Trails‘𝐺)𝑃) → (Fun ^◡𝑃 ↔ Fun ^◡⟨“𝐴𝐵𝐶𝐷”⟩))
26	22, 25	mpbird 256	. . 3 ⊢ ((𝜑 ∧ 𝐹(Trails‘𝐺)𝑃) → Fun ^◡𝑃)
27		isspth 28846	. . 3 ⊢ (𝐹(SPaths‘𝐺)𝑃 ↔ (𝐹(Trails‘𝐺)𝑃 ∧ Fun ^◡𝑃))
28	10, 26, 27	sylanbrc 583	. 2 ⊢ ((𝜑 ∧ 𝐹(Trails‘𝐺)𝑃) → 𝐹(SPaths‘𝐺)𝑃)
29	9, 28	mpdan 685	1 ⊢ (𝜑 → 𝐹(SPaths‘𝐺)𝑃)

Colors of variables: wff setvar class

Syntax hints: → wi 4 ∧ wa 396 ∧ w3a 1087 = wceq 1541 ∈ wcel 2106 ≠ wne 2939 ⊆ wss 3944 {cpr 4624 class class class wbr 5141 ^◡ccnv 5668 Fun wfun 6526 ‘cfv 6532 ⟨“cs3 14775 ⟨“cs4 14776 Vtxcvtx 28121 iEdgciedg 28122 Trailsctrls 28812 SPathscspths 28835

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 1913 ax-6 1971 ax-7 2011 ax-8 2108 ax-9 2116 ax-10 2137 ax-11 2154 ax-12 2171 ax-ext 2702 ax-rep 5278 ax-sep 5292 ax-nul 5299 ax-pow 5356 ax-pr 5420 ax-un 7708 ax-cnex 11148 ax-resscn 11149 ax-1cn 11150 ax-icn 11151 ax-addcl 11152 ax-addrcl 11153 ax-mulcl 11154 ax-mulrcl 11155 ax-mulcom 11156 ax-addass 11157 ax-mulass 11158 ax-distr 11159 ax-i2m1 11160 ax-1ne0 11161 ax-1rid 11162 ax-rnegex 11163 ax-rrecex 11164 ax-cnre 11165 ax-pre-lttri 11166 ax-pre-lttrn 11167 ax-pre-ltadd 11168 ax-pre-mulgt0 11169

This theorem depends on definitions: df-bi 206 df-an 397 df-or 846 df-ifp 1062 df-3or 1088 df-3an 1089 df-tru 1544 df-fal 1554 df-ex 1782 df-nf 1786 df-sb 2068 df-mo 2533 df-eu 2562 df-clab 2709 df-cleq 2723 df-clel 2809 df-nfc 2884 df-ne 2940 df-nel 3046 df-ral 3061 df-rex 3070 df-reu 3376 df-rab 3432 df-v 3475 df-sbc 3774 df-csb 3890 df-dif 3947 df-un 3949 df-in 3951 df-ss 3961 df-pss 3963 df-nul 4319 df-if 4523 df-pw 4598 df-sn 4623 df-pr 4625 df-tp 4627 df-op 4629 df-uni 4902 df-int 4944 df-iun 4992 df-br 5142 df-opab 5204 df-mpt 5225 df-tr 5259 df-id 5567 df-eprel 5573 df-po 5581 df-so 5582 df-fr 5624 df-we 5626 df-xp 5675 df-rel 5676 df-cnv 5677 df-co 5678 df-dm 5679 df-rn 5680 df-res 5681 df-ima 5682 df-pred 6289 df-ord 6356 df-on 6357 df-lim 6358 df-suc 6359 df-iota 6484 df-fun 6534 df-fn 6535 df-f 6536 df-f1 6537 df-fo 6538 df-f1o 6539 df-fv 6540 df-riota 7349 df-ov 7396 df-oprab 7397 df-mpo 7398 df-om 7839 df-1st 7957 df-2nd 7958 df-frecs 8248 df-wrecs 8279 df-recs 8353 df-rdg 8392 df-1o 8448 df-er 8686 df-map 8805 df-en 8923 df-dom 8924 df-sdom 8925 df-fin 8926 df-card 9916 df-pnf 11232 df-mnf 11233 df-xr 11234 df-ltxr 11235 df-le 11236 df-sub 11428 df-neg 11429 df-nn 12195 df-2 12257 df-3 12258 df-4 12259 df-n0 12455 df-z 12541 df-uz 12805 df-fz 13467 df-fzo 13610 df-hash 14273 df-word 14447 df-concat 14503 df-s1 14528 df-s2 14781 df-s3 14782 df-s4 14783 df-wlks 28721 df-trls 28814 df-spths 28839

This theorem is referenced by: 3spthond 29295

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