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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 30007 | . 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 30009 | . 2 ⊢ (𝜑 → 𝐹(SPaths‘𝐺)𝑃) |
| 12 | 3simpb 1150 | . . . 4 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑉 ∧ 𝐶 ∈ 𝑉) → (𝐴 ∈ 𝑉 ∧ 𝐶 ∈ 𝑉)) | |
| 13 | 3, 12 | syl 17 | . . 3 ⊢ (𝜑 → (𝐴 ∈ 𝑉 ∧ 𝐶 ∈ 𝑉)) |
| 14 | s2cli 14842 | . . . . 5 ⊢ 〈“𝐽𝐾”〉 ∈ Word V | |
| 15 | 2, 14 | eqeltri 2833 | . . . 4 ⊢ 𝐹 ∈ Word V |
| 16 | s3cli 14843 | . . . . 5 ⊢ 〈“𝐴𝐵𝐶”〉 ∈ Word V | |
| 17 | 1, 16 | eqeltri 2833 | . . . 4 ⊢ 𝑃 ∈ Word V |
| 18 | 15, 17 | pm3.2i 470 | . . 3 ⊢ (𝐹 ∈ Word V ∧ 𝑃 ∈ Word V) |
| 19 | 6 | isspthson 29811 | . . 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 587 | . 2 ⊢ (𝜑 → (𝐹(𝐴(SPathsOn‘𝐺)𝐶)𝑃 ↔ (𝐹(𝐴(TrailsOn‘𝐺)𝐶)𝑃 ∧ 𝐹(SPaths‘𝐺)𝑃))) |
| 21 | 9, 11, 20 | mpbir2and 714 | 1 ⊢ (𝜑 → 𝐹(𝐴(SPathsOn‘𝐺)𝐶)𝑃) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ↔ wb 206 ∧ wa 395 ∧ w3a 1087 = wceq 1542 ∈ wcel 2114 ≠ wne 2933 Vcvv 3430 ⊆ wss 3890 {cpr 4570 class class class wbr 5086 ‘cfv 6499 (class class class)co 7367 Word cword 14475 〈“cs2 14803 〈“cs3 14804 Vtxcvtx 29065 iEdgciedg 29066 TrailsOnctrlson 29758 SPathscspths 29779 SPathsOncspthson 29781 |
| 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 1912 ax-6 1969 ax-7 2010 ax-8 2116 ax-9 2124 ax-10 2147 ax-11 2163 ax-12 2185 ax-ext 2709 ax-rep 5213 ax-sep 5232 ax-nul 5242 ax-pow 5308 ax-pr 5376 ax-un 7689 ax-cnex 11094 ax-resscn 11095 ax-1cn 11096 ax-icn 11097 ax-addcl 11098 ax-addrcl 11099 ax-mulcl 11100 ax-mulrcl 11101 ax-mulcom 11102 ax-addass 11103 ax-mulass 11104 ax-distr 11105 ax-i2m1 11106 ax-1ne0 11107 ax-1rid 11108 ax-rnegex 11109 ax-rrecex 11110 ax-cnre 11111 ax-pre-lttri 11112 ax-pre-lttrn 11113 ax-pre-ltadd 11114 ax-pre-mulgt0 11115 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-ifp 1064 df-3or 1088 df-3an 1089 df-tru 1545 df-fal 1555 df-ex 1782 df-nf 1786 df-sb 2069 df-mo 2540 df-eu 2570 df-clab 2716 df-cleq 2729 df-clel 2812 df-nfc 2886 df-ne 2934 df-nel 3038 df-ral 3053 df-rex 3063 df-reu 3344 df-rab 3391 df-v 3432 df-sbc 3730 df-csb 3839 df-dif 3893 df-un 3895 df-in 3897 df-ss 3907 df-pss 3910 df-nul 4275 df-if 4468 df-pw 4544 df-sn 4569 df-pr 4571 df-tp 4573 df-op 4575 df-uni 4852 df-int 4891 df-iun 4936 df-br 5087 df-opab 5149 df-mpt 5168 df-tr 5194 df-id 5526 df-eprel 5531 df-po 5539 df-so 5540 df-fr 5584 df-we 5586 df-xp 5637 df-rel 5638 df-cnv 5639 df-co 5640 df-dm 5641 df-rn 5642 df-res 5643 df-ima 5644 df-pred 6266 df-ord 6327 df-on 6328 df-lim 6329 df-suc 6330 df-iota 6455 df-fun 6501 df-fn 6502 df-f 6503 df-f1 6504 df-fo 6505 df-f1o 6506 df-fv 6507 df-riota 7324 df-ov 7370 df-oprab 7371 df-mpo 7372 df-om 7818 df-1st 7942 df-2nd 7943 df-frecs 8231 df-wrecs 8262 df-recs 8311 df-rdg 8349 df-1o 8405 df-er 8643 df-map 8775 df-en 8894 df-dom 8895 df-sdom 8896 df-fin 8897 df-card 9863 df-pnf 11181 df-mnf 11182 df-xr 11183 df-ltxr 11184 df-le 11185 df-sub 11379 df-neg 11380 df-nn 12175 df-2 12244 df-3 12245 df-n0 12438 df-z 12525 df-uz 12789 df-fz 13462 df-fzo 13609 df-hash 14293 df-word 14476 df-concat 14533 df-s1 14559 df-s2 14810 df-s3 14811 df-wlks 29668 df-wlkson 29669 df-trls 29759 df-trlson 29760 df-spths 29783 df-spthson 29785 |
| This theorem is referenced by: 2pthon3v 30011 |
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