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| Mirrors > Home > MPE Home > Th. List > 3cycld | Structured version Visualization version GIF version | ||
| Description: Construction of a 3-cycle from three given edges in a graph. (Contributed by Alexander van der Vekens, 13-Nov-2017.) (Revised by AV, 10-Feb-2021.) (Revised by AV, 24-Mar-2021.) (Proof shortened by AV, 30-Oct-2021.) |
| 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)) |
| 3cycld.e | ⊢ (𝜑 → 𝐴 = 𝐷) |
| Ref | Expression |
|---|---|
| 3cycld | ⊢ (𝜑 → 𝐹(Cycles‘𝐺)𝑃) |
| 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 | 3pthd 30805 | . 2 ⊢ (𝜑 → 𝐹(Paths‘𝐺)𝑃) |
| 10 | 3cycld.e | . . 3 ⊢ (𝜑 → 𝐴 = 𝐷) | |
| 11 | 1 | fveq1i 6909 | . . . . . 6 ⊢ (𝑃‘0) = (〈“𝐴𝐵𝐶𝐷”〉‘0) |
| 12 | s4fv0 15075 | . . . . . 6 ⊢ (𝐴 ∈ 𝑉 → (〈“𝐴𝐵𝐶𝐷”〉‘0) = 𝐴) | |
| 13 | 11, 12 | eqtrid 2810 | . . . . 5 ⊢ (𝐴 ∈ 𝑉 → (𝑃‘0) = 𝐴) |
| 14 | 13 | ad3antrrr 743 | . . . 4 ⊢ ((((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑉) ∧ (𝐶 ∈ 𝑉 ∧ 𝐷 ∈ 𝑉)) ∧ 𝐴 = 𝐷) → (𝑃‘0) = 𝐴) |
| 15 | simpr 490 | . . . 4 ⊢ ((((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑉) ∧ (𝐶 ∈ 𝑉 ∧ 𝐷 ∈ 𝑉)) ∧ 𝐴 = 𝐷) → 𝐴 = 𝐷) | |
| 16 | 2 | fveq2i 6911 | . . . . . . . . 9 ⊢ (♯‘𝐹) = (♯‘〈“𝐽𝐾𝐿”〉) |
| 17 | s3len 15074 | . . . . . . . . 9 ⊢ (♯‘〈“𝐽𝐾𝐿”〉) = 3 | |
| 18 | 16, 17 | eqtri 2786 | . . . . . . . 8 ⊢ (♯‘𝐹) = 3 |
| 19 | 1, 18 | fveq12i 6914 | . . . . . . 7 ⊢ (𝑃‘(♯‘𝐹)) = (〈“𝐴𝐵𝐶𝐷”〉‘3) |
| 20 | s4fv3 15078 | . . . . . . 7 ⊢ (𝐷 ∈ 𝑉 → (〈“𝐴𝐵𝐶𝐷”〉‘3) = 𝐷) | |
| 21 | 19, 20 | eqtr2id 2811 | . . . . . 6 ⊢ (𝐷 ∈ 𝑉 → 𝐷 = (𝑃‘(♯‘𝐹))) |
| 22 | 21 | adantl 487 | . . . . 5 ⊢ ((𝐶 ∈ 𝑉 ∧ 𝐷 ∈ 𝑉) → 𝐷 = (𝑃‘(♯‘𝐹))) |
| 23 | 22 | ad2antlr 740 | . . . 4 ⊢ ((((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑉) ∧ (𝐶 ∈ 𝑉 ∧ 𝐷 ∈ 𝑉)) ∧ 𝐴 = 𝐷) → 𝐷 = (𝑃‘(♯‘𝐹))) |
| 24 | 14, 15, 23 | 3eqtrd 2802 | . . 3 ⊢ ((((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑉) ∧ (𝐶 ∈ 𝑉 ∧ 𝐷 ∈ 𝑉)) ∧ 𝐴 = 𝐷) → (𝑃‘0) = (𝑃‘(♯‘𝐹))) |
| 25 | 3, 10, 24 | syl2anc 596 | . 2 ⊢ (𝜑 → (𝑃‘0) = (𝑃‘(♯‘𝐹))) |
| 26 | iscycl 30408 | . 2 ⊢ (𝐹(Cycles‘𝐺)𝑃 ↔ (𝐹(Paths‘𝐺)𝑃 ∧ (𝑃‘0) = (𝑃‘(♯‘𝐹)))) | |
| 27 | 9, 25, 26 | sylanbrc 595 | 1 ⊢ (𝜑 → 𝐹(Cycles‘𝐺)𝑃) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ∧ wa 401 ∧ w3a 1103 = wceq 1570 ∈ wcel 2147 ≠ wne 2959 ⊆ wss 3900 {cpr 4590 class class class wbr 5106 ‘cfv 6558 0cc0 11227 3c3 12425 ♯chash 14501 〈“cs3 15021 〈“cs4 15022 Vtxcvtx 29604 iEdgciedg 29605 Pathscpths 30325 Cyclesccycls 30402 |
| 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 1945 ax-6 2002 ax-7 2043 ax-8 2149 ax-9 2157 ax-10 2180 ax-11 2197 ax-12 2216 ax-ext 2735 ax-rep 5235 ax-sep 5252 ax-nul 5263 ax-pow 5331 ax-pr 5395 ax-un 7775 ax-cnex 11283 ax-resscn 11284 ax-1cn 11285 ax-icn 11286 ax-addcl 11287 ax-addrcl 11288 ax-mulcl 11289 ax-mulrcl 11290 ax-mulcom 11291 ax-addass 11292 ax-mulass 11293 ax-distr 11294 ax-i2m1 11295 ax-1ne0 11296 ax-1rid 11297 ax-rnegex 11298 ax-rrecex 11299 ax-cnre 11300 ax-pre-lttri 11301 ax-pre-lttrn 11302 ax-pre-ltadd 11303 ax-pre-mulgt0 11304 |
| 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 2102 df-mo 2567 df-eu 2597 df-clab 2742 df-cleq 2755 df-clel 2839 df-nfc 2913 df-ne 2960 df-nel 3066 df-ral 3081 df-rex 3091 df-reu 3370 df-rab 3417 df-v 3456 df-sbc 3743 df-csb 3852 df-ss 3901 df-pss 4017 df-dif 4050 df-in 4094 df-un 4154 df-nul 4282 df-if 4486 df-pw 4562 df-sn 4589 df-pr 4591 df-tp 4593 df-op 4839 df-uni 4871 df-int 4911 df-iun 4956 df-br 5107 df-opab 5171 df-mpt 5190 df-tr 5216 df-id 5550 df-eprel 5555 df-po 5563 df-so 5564 df-fr 5608 df-we 5610 df-xp 5661 df-rel 5662 df-cnv 5663 df-co 5664 df-dm 5665 df-rn 5666 df-res 5667 df-ima 5668 df-pred 6322 df-ord 6383 df-on 6384 df-lim 6385 df-suc 6386 df-iota 6512 df-fun 6560 df-fn 6561 df-f 6562 df-f1 6563 df-fo 6564 df-f1o 6565 df-fv 6566 df-riota 7400 df-ov 7446 df-oprab 7447 df-mpo 7448 df-om 7902 df-1st 8025 df-2nd 8026 df-frecs 8327 df-wrecs 8358 df-recs 8407 df-rdg 8446 df-1o 8504 df-er 8745 df-map 8877 df-en 9002 df-dom 9003 df-sdom 9004 df-fin 9005 df-card 10047 df-pnf 11372 df-mnf 11373 df-xr 11374 df-ltxr 11375 df-le 11376 df-sub 11570 df-neg 11571 df-nn 12363 df-2 12432 df-3 12433 df-4 12434 df-n0 12634 df-z 12721 df-uz 12993 df-fz 13667 df-fzo 13816 df-hash 14502 df-word 14686 df-concat 14743 df-s1 14770 df-s2 15027 df-s3 15028 df-s4 15029 df-wlks 30210 df-trls 30305 df-pths 30329 df-cycls 30404 |
| This theorem is used by: 3cyclpd 30810 |
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