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Mirrors > Home > MPE Home > Th. List > clwwlknonex2e | Structured version Visualization version GIF version |
Description: Extending a closed walk 𝑊 on vertex 𝑋 by an additional edge (forth and back) results in a closed walk on vertex 𝑋. (Contributed by AV, 17-Apr-2022.) |
Ref | Expression |
---|---|
clwwlknonex2.v | ⊢ 𝑉 = (Vtx‘𝐺) |
clwwlknonex2.e | ⊢ 𝐸 = (Edg‘𝐺) |
Ref | Expression |
---|---|
clwwlknonex2e | ⊢ (((𝑋 ∈ 𝑉 ∧ 𝑌 ∈ 𝑉 ∧ 𝑁 ∈ (ℤ≥‘3)) ∧ {𝑋, 𝑌} ∈ 𝐸 ∧ 𝑊 ∈ (𝑋(ClWWalksNOn‘𝐺)(𝑁 − 2))) → ((𝑊 ++ 〈“𝑋”〉) ++ 〈“𝑌”〉) ∈ (𝑋(ClWWalksNOn‘𝐺)𝑁)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | clwwlknonex2.v | . . 3 ⊢ 𝑉 = (Vtx‘𝐺) | |
2 | clwwlknonex2.e | . . 3 ⊢ 𝐸 = (Edg‘𝐺) | |
3 | 1, 2 | clwwlknonex2 28374 | . 2 ⊢ (((𝑋 ∈ 𝑉 ∧ 𝑌 ∈ 𝑉 ∧ 𝑁 ∈ (ℤ≥‘3)) ∧ {𝑋, 𝑌} ∈ 𝐸 ∧ 𝑊 ∈ (𝑋(ClWWalksNOn‘𝐺)(𝑁 − 2))) → ((𝑊 ++ 〈“𝑋”〉) ++ 〈“𝑌”〉) ∈ (𝑁 ClWWalksN 𝐺)) |
4 | isclwwlknon 28356 | . . . . 5 ⊢ (𝑊 ∈ (𝑋(ClWWalksNOn‘𝐺)(𝑁 − 2)) ↔ (𝑊 ∈ ((𝑁 − 2) ClWWalksN 𝐺) ∧ (𝑊‘0) = 𝑋)) | |
5 | isclwwlkn 28292 | . . . . . . . . . 10 ⊢ (𝑊 ∈ ((𝑁 − 2) ClWWalksN 𝐺) ↔ (𝑊 ∈ (ClWWalks‘𝐺) ∧ (♯‘𝑊) = (𝑁 − 2))) | |
6 | 1 | clwwlkbp 28250 | . . . . . . . . . . . . 13 ⊢ (𝑊 ∈ (ClWWalks‘𝐺) → (𝐺 ∈ V ∧ 𝑊 ∈ Word 𝑉 ∧ 𝑊 ≠ ∅)) |
7 | 6 | simp2d 1141 | . . . . . . . . . . . 12 ⊢ (𝑊 ∈ (ClWWalks‘𝐺) → 𝑊 ∈ Word 𝑉) |
8 | clwwlkgt0 28251 | . . . . . . . . . . . 12 ⊢ (𝑊 ∈ (ClWWalks‘𝐺) → 0 < (♯‘𝑊)) | |
9 | 7, 8 | jca 511 | . . . . . . . . . . 11 ⊢ (𝑊 ∈ (ClWWalks‘𝐺) → (𝑊 ∈ Word 𝑉 ∧ 0 < (♯‘𝑊))) |
10 | 9 | adantr 480 | . . . . . . . . . 10 ⊢ ((𝑊 ∈ (ClWWalks‘𝐺) ∧ (♯‘𝑊) = (𝑁 − 2)) → (𝑊 ∈ Word 𝑉 ∧ 0 < (♯‘𝑊))) |
11 | 5, 10 | sylbi 216 | . . . . . . . . 9 ⊢ (𝑊 ∈ ((𝑁 − 2) ClWWalksN 𝐺) → (𝑊 ∈ Word 𝑉 ∧ 0 < (♯‘𝑊))) |
12 | 11 | ad2antrl 724 | . . . . . . . 8 ⊢ (((𝑋 ∈ 𝑉 ∧ 𝑌 ∈ 𝑉 ∧ 𝑁 ∈ (ℤ≥‘3)) ∧ (𝑊 ∈ ((𝑁 − 2) ClWWalksN 𝐺) ∧ (𝑊‘0) = 𝑋)) → (𝑊 ∈ Word 𝑉 ∧ 0 < (♯‘𝑊))) |
13 | ccat2s1fst 14279 | . . . . . . . 8 ⊢ ((𝑊 ∈ Word 𝑉 ∧ 0 < (♯‘𝑊)) → (((𝑊 ++ 〈“𝑋”〉) ++ 〈“𝑌”〉)‘0) = (𝑊‘0)) | |
14 | 12, 13 | syl 17 | . . . . . . 7 ⊢ (((𝑋 ∈ 𝑉 ∧ 𝑌 ∈ 𝑉 ∧ 𝑁 ∈ (ℤ≥‘3)) ∧ (𝑊 ∈ ((𝑁 − 2) ClWWalksN 𝐺) ∧ (𝑊‘0) = 𝑋)) → (((𝑊 ++ 〈“𝑋”〉) ++ 〈“𝑌”〉)‘0) = (𝑊‘0)) |
15 | simprr 769 | . . . . . . 7 ⊢ (((𝑋 ∈ 𝑉 ∧ 𝑌 ∈ 𝑉 ∧ 𝑁 ∈ (ℤ≥‘3)) ∧ (𝑊 ∈ ((𝑁 − 2) ClWWalksN 𝐺) ∧ (𝑊‘0) = 𝑋)) → (𝑊‘0) = 𝑋) | |
16 | 14, 15 | eqtrd 2778 | . . . . . 6 ⊢ (((𝑋 ∈ 𝑉 ∧ 𝑌 ∈ 𝑉 ∧ 𝑁 ∈ (ℤ≥‘3)) ∧ (𝑊 ∈ ((𝑁 − 2) ClWWalksN 𝐺) ∧ (𝑊‘0) = 𝑋)) → (((𝑊 ++ 〈“𝑋”〉) ++ 〈“𝑌”〉)‘0) = 𝑋) |
17 | 16 | ex 412 | . . . . 5 ⊢ ((𝑋 ∈ 𝑉 ∧ 𝑌 ∈ 𝑉 ∧ 𝑁 ∈ (ℤ≥‘3)) → ((𝑊 ∈ ((𝑁 − 2) ClWWalksN 𝐺) ∧ (𝑊‘0) = 𝑋) → (((𝑊 ++ 〈“𝑋”〉) ++ 〈“𝑌”〉)‘0) = 𝑋)) |
18 | 4, 17 | syl5bi 241 | . . . 4 ⊢ ((𝑋 ∈ 𝑉 ∧ 𝑌 ∈ 𝑉 ∧ 𝑁 ∈ (ℤ≥‘3)) → (𝑊 ∈ (𝑋(ClWWalksNOn‘𝐺)(𝑁 − 2)) → (((𝑊 ++ 〈“𝑋”〉) ++ 〈“𝑌”〉)‘0) = 𝑋)) |
19 | 18 | a1d 25 | . . 3 ⊢ ((𝑋 ∈ 𝑉 ∧ 𝑌 ∈ 𝑉 ∧ 𝑁 ∈ (ℤ≥‘3)) → ({𝑋, 𝑌} ∈ 𝐸 → (𝑊 ∈ (𝑋(ClWWalksNOn‘𝐺)(𝑁 − 2)) → (((𝑊 ++ 〈“𝑋”〉) ++ 〈“𝑌”〉)‘0) = 𝑋))) |
20 | 19 | 3imp 1109 | . 2 ⊢ (((𝑋 ∈ 𝑉 ∧ 𝑌 ∈ 𝑉 ∧ 𝑁 ∈ (ℤ≥‘3)) ∧ {𝑋, 𝑌} ∈ 𝐸 ∧ 𝑊 ∈ (𝑋(ClWWalksNOn‘𝐺)(𝑁 − 2))) → (((𝑊 ++ 〈“𝑋”〉) ++ 〈“𝑌”〉)‘0) = 𝑋) |
21 | isclwwlknon 28356 | . 2 ⊢ (((𝑊 ++ 〈“𝑋”〉) ++ 〈“𝑌”〉) ∈ (𝑋(ClWWalksNOn‘𝐺)𝑁) ↔ (((𝑊 ++ 〈“𝑋”〉) ++ 〈“𝑌”〉) ∈ (𝑁 ClWWalksN 𝐺) ∧ (((𝑊 ++ 〈“𝑋”〉) ++ 〈“𝑌”〉)‘0) = 𝑋)) | |
22 | 3, 20, 21 | sylanbrc 582 | 1 ⊢ (((𝑋 ∈ 𝑉 ∧ 𝑌 ∈ 𝑉 ∧ 𝑁 ∈ (ℤ≥‘3)) ∧ {𝑋, 𝑌} ∈ 𝐸 ∧ 𝑊 ∈ (𝑋(ClWWalksNOn‘𝐺)(𝑁 − 2))) → ((𝑊 ++ 〈“𝑋”〉) ++ 〈“𝑌”〉) ∈ (𝑋(ClWWalksNOn‘𝐺)𝑁)) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∧ wa 395 ∧ w3a 1085 = wceq 1539 ∈ wcel 2108 ≠ wne 2942 Vcvv 3422 ∅c0 4253 {cpr 4560 class class class wbr 5070 ‘cfv 6418 (class class class)co 7255 0cc0 10802 < clt 10940 − cmin 11135 2c2 11958 3c3 11959 ℤ≥cuz 12511 ♯chash 13972 Word cword 14145 ++ cconcat 14201 〈“cs1 14228 Vtxcvtx 27269 Edgcedg 27320 ClWWalkscclwwlk 28246 ClWWalksN cclwwlkn 28289 ClWWalksNOncclwwlknon 28352 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1799 ax-4 1813 ax-5 1914 ax-6 1972 ax-7 2012 ax-8 2110 ax-9 2118 ax-10 2139 ax-11 2156 ax-12 2173 ax-ext 2709 ax-rep 5205 ax-sep 5218 ax-nul 5225 ax-pow 5283 ax-pr 5347 ax-un 7566 ax-cnex 10858 ax-resscn 10859 ax-1cn 10860 ax-icn 10861 ax-addcl 10862 ax-addrcl 10863 ax-mulcl 10864 ax-mulrcl 10865 ax-mulcom 10866 ax-addass 10867 ax-mulass 10868 ax-distr 10869 ax-i2m1 10870 ax-1ne0 10871 ax-1rid 10872 ax-rnegex 10873 ax-rrecex 10874 ax-cnre 10875 ax-pre-lttri 10876 ax-pre-lttrn 10877 ax-pre-ltadd 10878 ax-pre-mulgt0 10879 |
This theorem depends on definitions: df-bi 206 df-an 396 df-or 844 df-3or 1086 df-3an 1087 df-tru 1542 df-fal 1552 df-ex 1784 df-nf 1788 df-sb 2069 df-mo 2540 df-eu 2569 df-clab 2716 df-cleq 2730 df-clel 2817 df-nfc 2888 df-ne 2943 df-nel 3049 df-ral 3068 df-rex 3069 df-reu 3070 df-rab 3072 df-v 3424 df-sbc 3712 df-csb 3829 df-dif 3886 df-un 3888 df-in 3890 df-ss 3900 df-pss 3902 df-nul 4254 df-if 4457 df-pw 4532 df-sn 4559 df-pr 4561 df-tp 4563 df-op 4565 df-uni 4837 df-int 4877 df-iun 4923 df-br 5071 df-opab 5133 df-mpt 5154 df-tr 5188 df-id 5480 df-eprel 5486 df-po 5494 df-so 5495 df-fr 5535 df-we 5537 df-xp 5586 df-rel 5587 df-cnv 5588 df-co 5589 df-dm 5590 df-rn 5591 df-res 5592 df-ima 5593 df-pred 6191 df-ord 6254 df-on 6255 df-lim 6256 df-suc 6257 df-iota 6376 df-fun 6420 df-fn 6421 df-f 6422 df-f1 6423 df-fo 6424 df-f1o 6425 df-fv 6426 df-riota 7212 df-ov 7258 df-oprab 7259 df-mpo 7260 df-om 7688 df-1st 7804 df-2nd 7805 df-frecs 8068 df-wrecs 8099 df-recs 8173 df-rdg 8212 df-1o 8267 df-oadd 8271 df-er 8456 df-map 8575 df-en 8692 df-dom 8693 df-sdom 8694 df-fin 8695 df-card 9628 df-pnf 10942 df-mnf 10943 df-xr 10944 df-ltxr 10945 df-le 10946 df-sub 11137 df-neg 11138 df-nn 11904 df-2 11966 df-3 11967 df-n0 12164 df-xnn0 12236 df-z 12250 df-uz 12512 df-rp 12660 df-fz 13169 df-fzo 13312 df-hash 13973 df-word 14146 df-lsw 14194 df-concat 14202 df-s1 14229 df-clwwlk 28247 df-clwwlkn 28290 df-clwwlknon 28353 |
This theorem is referenced by: (None) |
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