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| Mirrors > Home > MPE Home > Th. List > 2pthond | Structured version Visualization version GIF version | ||
| Description: A simple path of length 2 from one vertex to another, different vertex via a third vertex. (Contributed by Alexander van der Vekens, 6-Dec-2017.) (Revised by AV, 24-Jan-2021.) (Proof shortened by AV, 30-Jan-2021.) (Revised by AV, 24-Mar-2021.) |
| Ref | Expression |
|---|---|
| 2wlkd.p | ⊢ 𝑃 = 〈“𝐴𝐵𝐶”〉 |
| 2wlkd.f | ⊢ 𝐹 = 〈“𝐽𝐾”〉 |
| 2wlkd.s | ⊢ (𝜑 → (𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑉 ∧ 𝐶 ∈ 𝑉)) |
| 2wlkd.n | ⊢ (𝜑 → (𝐴 ≠ 𝐵 ∧ 𝐵 ≠ 𝐶)) |
| 2wlkd.e | ⊢ (𝜑 → ({𝐴, 𝐵} ⊆ (𝐼‘𝐽) ∧ {𝐵, 𝐶} ⊆ (𝐼‘𝐾))) |
| 2wlkd.v | ⊢ 𝑉 = (Vtx‘𝐺) |
| 2wlkd.i | ⊢ 𝐼 = (iEdg‘𝐺) |
| 2trld.n | ⊢ (𝜑 → 𝐽 ≠ 𝐾) |
| 2spthd.n | ⊢ (𝜑 → 𝐴 ≠ 𝐶) |
| Ref | Expression |
|---|---|
| 2pthond | ⊢ (𝜑 → 𝐹(𝐴(SPathsOn‘𝐺)𝐶)𝑃) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | 2wlkd.p | . . 3 ⊢ 𝑃 = 〈“𝐴𝐵𝐶”〉 | |
| 2 | 2wlkd.f | . . 3 ⊢ 𝐹 = 〈“𝐽𝐾”〉 | |
| 3 | 2wlkd.s | . . 3 ⊢ (𝜑 → (𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑉 ∧ 𝐶 ∈ 𝑉)) | |
| 4 | 2wlkd.n | . . 3 ⊢ (𝜑 → (𝐴 ≠ 𝐵 ∧ 𝐵 ≠ 𝐶)) | |
| 5 | 2wlkd.e | . . 3 ⊢ (𝜑 → ({𝐴, 𝐵} ⊆ (𝐼‘𝐽) ∧ {𝐵, 𝐶} ⊆ (𝐼‘𝐾))) | |
| 6 | 2wlkd.v | . . 3 ⊢ 𝑉 = (Vtx‘𝐺) | |
| 7 | 2wlkd.i | . . 3 ⊢ 𝐼 = (iEdg‘𝐺) | |
| 8 | 2trld.n | . . 3 ⊢ (𝜑 → 𝐽 ≠ 𝐾) | |
| 9 | 1, 2, 3, 4, 5, 6, 7, 8 | 2trlond 30529 | . 2 ⊢ (𝜑 → 𝐹(𝐴(TrailsOn‘𝐺)𝐶)𝑃) |
| 10 | 2spthd.n | . . 3 ⊢ (𝜑 → 𝐴 ≠ 𝐶) | |
| 11 | 1, 2, 3, 4, 5, 6, 7, 8, 10 | 2spthd 30531 | . 2 ⊢ (𝜑 → 𝐹(SPaths‘𝐺)𝑃) |
| 12 | 3simpb 1167 | . . . 4 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑉 ∧ 𝐶 ∈ 𝑉) → (𝐴 ∈ 𝑉 ∧ 𝐶 ∈ 𝑉)) | |
| 13 | 3, 12 | syl 18 | . . 3 ⊢ (𝜑 → (𝐴 ∈ 𝑉 ∧ 𝐶 ∈ 𝑉)) |
| 14 | s2cli 15032 | . . . . 5 ⊢ 〈“𝐽𝐾”〉 ∈ Word V | |
| 15 | 2, 14 | eqeltri 2856 | . . . 4 ⊢ 𝐹 ∈ Word V |
| 16 | s3cli 15033 | . . . . 5 ⊢ 〈“𝐴𝐵𝐶”〉 ∈ Word V | |
| 17 | 1, 16 | eqeltri 2856 | . . . 4 ⊢ 𝑃 ∈ Word V |
| 18 | 15, 17 | pm3.2i 476 | . . 3 ⊢ (𝐹 ∈ Word V ∧ 𝑃 ∈ Word V) |
| 19 | 6 | isspthson 30330 | . . 3 ⊢ (((𝐴 ∈ 𝑉 ∧ 𝐶 ∈ 𝑉) ∧ (𝐹 ∈ Word V ∧ 𝑃 ∈ Word V)) → (𝐹(𝐴(SPathsOn‘𝐺)𝐶)𝑃 ↔ (𝐹(𝐴(TrailsOn‘𝐺)𝐶)𝑃 ∧ 𝐹(SPaths‘𝐺)𝑃))) |
| 20 | 13, 18, 19 | sylancl 598 | . 2 ⊢ (𝜑 → (𝐹(𝐴(SPathsOn‘𝐺)𝐶)𝑃 ↔ (𝐹(𝐴(TrailsOn‘𝐺)𝐶)𝑃 ∧ 𝐹(SPaths‘𝐺)𝑃))) |
| 21 | 9, 11, 20 | mpbir2and 726 | 1 ⊢ (𝜑 → 𝐹(𝐴(SPathsOn‘𝐺)𝐶)𝑃) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ↔ wb 209 ∧ wa 401 ∧ w3a 1103 = wceq 1569 ∈ wcel 2144 ≠ wne 2955 Vcvv 3450 ⊆ wss 3895 {cpr 4585 class class class wbr 5102 ‘cfv 6538 (class class class)co 7420 Word cword 14659 〈“cs2 14993 〈“cs3 14994 Vtxcvtx 29575 iEdgciedg 29576 TrailsOnctrlson 30275 SPathscspths 30297 SPathsOncspthson 30299 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1827 ax-4 1841 ax-5 1942 ax-6 1999 ax-7 2040 ax-8 2146 ax-9 2154 ax-10 2177 ax-11 2193 ax-12 2212 ax-ext 2732 ax-rep 5231 ax-sep 5248 ax-nul 5259 ax-pow 5326 ax-pr 5390 ax-un 7751 ax-cnex 11257 ax-resscn 11258 ax-1cn 11259 ax-icn 11260 ax-addcl 11261 ax-addrcl 11262 ax-mulcl 11263 ax-mulrcl 11264 ax-mulcom 11265 ax-addass 11266 ax-mulass 11267 ax-distr 11268 ax-i2m1 11269 ax-1ne0 11270 ax-1rid 11271 ax-rnegex 11272 ax-rrecex 11273 ax-cnre 11274 ax-pre-lttri 11275 ax-pre-lttrn 11276 ax-pre-ltadd 11277 ax-pre-mulgt0 11278 |
| 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 1572 df-fal 1582 df-ex 1812 df-nf 1816 df-sb 2099 df-mo 2564 df-eu 2594 df-clab 2739 df-cleq 2752 df-clel 2835 df-nfc 2909 df-ne 2956 df-nel 3062 df-ral 3077 df-rex 3087 df-reu 3366 df-rab 3413 df-v 3452 df-sbc 3739 df-csb 3847 df-ss 3896 df-pss 4014 df-dif 4047 df-in 4091 df-un 4151 df-nul 4279 df-if 4482 df-pw 4558 df-sn 4584 df-pr 4586 df-tp 4588 df-op 4590 df-uni 4867 df-int 4907 df-iun 4952 df-br 5103 df-opab 5167 df-mpt 5186 df-tr 5212 df-id 5545 df-eprel 5550 df-po 5558 df-so 5559 df-fr 5603 df-we 5605 df-xp 5656 df-rel 5657 df-cnv 5658 df-co 5659 df-dm 5660 df-rn 5661 df-res 5662 df-ima 5663 df-pred 6304 df-ord 6365 df-on 6366 df-lim 6367 df-suc 6368 df-iota 6494 df-fun 6540 df-fn 6541 df-f 6542 df-f1 6543 df-fo 6544 df-f1o 6545 df-fv 6546 df-riota 7377 df-ov 7423 df-oprab 7424 df-mpo 7425 df-om 7878 df-1st 8001 df-2nd 8002 df-frecs 8300 df-wrecs 8331 df-recs 8380 df-rdg 8419 df-1o 8477 df-er 8718 df-map 8850 df-en 8975 df-dom 8976 df-sdom 8977 df-fin 8978 df-card 10021 df-pnf 11346 df-mnf 11347 df-xr 11348 df-ltxr 11349 df-le 11350 df-sub 11544 df-neg 11545 df-nn 12337 df-2 12406 df-3 12407 df-n0 12608 df-z 12695 df-uz 12967 df-fz 13641 df-fzo 13790 df-hash 14476 df-word 14660 df-concat 14717 df-s1 14744 df-s2 15000 df-s3 15001 df-wlks 30181 df-wlkson 30182 df-trls 30276 df-trlson 30277 df-spths 30301 df-spthson 30303 |
| This theorem is used by: 2pthon3v 30533 |
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