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Mirrors > Home > MPE Home > Th. List > numclwwlk1lem2 | Structured version Visualization version GIF version |
Description: The set of double loops of length 𝑁 on vertex 𝑋 and the set of closed walks of length less by 2 on 𝑋 combined with the neighbors of 𝑋 are equinumerous. (Contributed by Alexander van der Vekens, 6-Jul-2018.) (Revised by AV, 29-May-2021.) (Revised by AV, 31-Jul-2022.) (Proof shortened by AV, 3-Nov-2022.) |
Ref | Expression |
---|---|
extwwlkfab.v | ⊢ 𝑉 = (Vtx‘𝐺) |
extwwlkfab.c | ⊢ 𝐶 = (𝑣 ∈ 𝑉, 𝑛 ∈ (ℤ≥‘2) ↦ {𝑤 ∈ (𝑣(ClWWalksNOn‘𝐺)𝑛) ∣ (𝑤‘(𝑛 − 2)) = 𝑣}) |
extwwlkfab.f | ⊢ 𝐹 = (𝑋(ClWWalksNOn‘𝐺)(𝑁 − 2)) |
Ref | Expression |
---|---|
numclwwlk1lem2 | ⊢ ((𝐺 ∈ USGraph ∧ 𝑋 ∈ 𝑉 ∧ 𝑁 ∈ (ℤ≥‘3)) → (𝑋𝐶𝑁) ≈ (𝐹 × (𝐺 NeighbVtx 𝑋))) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | extwwlkfab.v | . . 3 ⊢ 𝑉 = (Vtx‘𝐺) | |
2 | extwwlkfab.c | . . 3 ⊢ 𝐶 = (𝑣 ∈ 𝑉, 𝑛 ∈ (ℤ≥‘2) ↦ {𝑤 ∈ (𝑣(ClWWalksNOn‘𝐺)𝑛) ∣ (𝑤‘(𝑛 − 2)) = 𝑣}) | |
3 | extwwlkfab.f | . . 3 ⊢ 𝐹 = (𝑋(ClWWalksNOn‘𝐺)(𝑁 − 2)) | |
4 | oveq1 7162 | . . . . 5 ⊢ (𝑥 = 𝑢 → (𝑥 prefix (𝑁 − 2)) = (𝑢 prefix (𝑁 − 2))) | |
5 | fveq1 6668 | . . . . 5 ⊢ (𝑥 = 𝑢 → (𝑥‘(𝑁 − 1)) = (𝑢‘(𝑁 − 1))) | |
6 | 4, 5 | opeq12d 4810 | . . . 4 ⊢ (𝑥 = 𝑢 → 〈(𝑥 prefix (𝑁 − 2)), (𝑥‘(𝑁 − 1))〉 = 〈(𝑢 prefix (𝑁 − 2)), (𝑢‘(𝑁 − 1))〉) |
7 | 6 | cbvmptv 5168 | . . 3 ⊢ (𝑥 ∈ (𝑋𝐶𝑁) ↦ 〈(𝑥 prefix (𝑁 − 2)), (𝑥‘(𝑁 − 1))〉) = (𝑢 ∈ (𝑋𝐶𝑁) ↦ 〈(𝑢 prefix (𝑁 − 2)), (𝑢‘(𝑁 − 1))〉) |
8 | 1, 2, 3, 7 | numclwwlk1lem2f1o 28137 | . 2 ⊢ ((𝐺 ∈ USGraph ∧ 𝑋 ∈ 𝑉 ∧ 𝑁 ∈ (ℤ≥‘3)) → (𝑥 ∈ (𝑋𝐶𝑁) ↦ 〈(𝑥 prefix (𝑁 − 2)), (𝑥‘(𝑁 − 1))〉):(𝑋𝐶𝑁)–1-1-onto→(𝐹 × (𝐺 NeighbVtx 𝑋))) |
9 | ovex 7188 | . . 3 ⊢ (𝑋𝐶𝑁) ∈ V | |
10 | 9 | f1oen 8529 | . 2 ⊢ ((𝑥 ∈ (𝑋𝐶𝑁) ↦ 〈(𝑥 prefix (𝑁 − 2)), (𝑥‘(𝑁 − 1))〉):(𝑋𝐶𝑁)–1-1-onto→(𝐹 × (𝐺 NeighbVtx 𝑋)) → (𝑋𝐶𝑁) ≈ (𝐹 × (𝐺 NeighbVtx 𝑋))) |
11 | 8, 10 | syl 17 | 1 ⊢ ((𝐺 ∈ USGraph ∧ 𝑋 ∈ 𝑉 ∧ 𝑁 ∈ (ℤ≥‘3)) → (𝑋𝐶𝑁) ≈ (𝐹 × (𝐺 NeighbVtx 𝑋))) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∧ w3a 1083 = wceq 1533 ∈ wcel 2110 {crab 3142 〈cop 4572 class class class wbr 5065 ↦ cmpt 5145 × cxp 5552 –1-1-onto→wf1o 6353 ‘cfv 6354 (class class class)co 7155 ∈ cmpo 7157 ≈ cen 8505 1c1 10537 − cmin 10869 2c2 11691 3c3 11692 ℤ≥cuz 12242 prefix cpfx 14031 Vtxcvtx 26780 USGraphcusgr 26933 NeighbVtx cnbgr 27113 ClWWalksNOncclwwlknon 27865 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1792 ax-4 1806 ax-5 1907 ax-6 1966 ax-7 2011 ax-8 2112 ax-9 2120 ax-10 2141 ax-11 2157 ax-12 2173 ax-ext 2793 ax-rep 5189 ax-sep 5202 ax-nul 5209 ax-pow 5265 ax-pr 5329 ax-un 7460 ax-cnex 10592 ax-resscn 10593 ax-1cn 10594 ax-icn 10595 ax-addcl 10596 ax-addrcl 10597 ax-mulcl 10598 ax-mulrcl 10599 ax-mulcom 10600 ax-addass 10601 ax-mulass 10602 ax-distr 10603 ax-i2m1 10604 ax-1ne0 10605 ax-1rid 10606 ax-rnegex 10607 ax-rrecex 10608 ax-cnre 10609 ax-pre-lttri 10610 ax-pre-lttrn 10611 ax-pre-ltadd 10612 ax-pre-mulgt0 10613 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3or 1084 df-3an 1085 df-tru 1536 df-fal 1546 df-ex 1777 df-nf 1781 df-sb 2066 df-mo 2618 df-eu 2650 df-clab 2800 df-cleq 2814 df-clel 2893 df-nfc 2963 df-ne 3017 df-nel 3124 df-ral 3143 df-rex 3144 df-reu 3145 df-rmo 3146 df-rab 3147 df-v 3496 df-sbc 3772 df-csb 3883 df-dif 3938 df-un 3940 df-in 3942 df-ss 3951 df-pss 3953 df-nul 4291 df-if 4467 df-pw 4540 df-sn 4567 df-pr 4569 df-tp 4571 df-op 4573 df-uni 4838 df-int 4876 df-iun 4920 df-br 5066 df-opab 5128 df-mpt 5146 df-tr 5172 df-id 5459 df-eprel 5464 df-po 5473 df-so 5474 df-fr 5513 df-we 5515 df-xp 5560 df-rel 5561 df-cnv 5562 df-co 5563 df-dm 5564 df-rn 5565 df-res 5566 df-ima 5567 df-pred 6147 df-ord 6193 df-on 6194 df-lim 6195 df-suc 6196 df-iota 6313 df-fun 6356 df-fn 6357 df-f 6358 df-f1 6359 df-fo 6360 df-f1o 6361 df-fv 6362 df-riota 7113 df-ov 7158 df-oprab 7159 df-mpo 7160 df-om 7580 df-1st 7688 df-2nd 7689 df-wrecs 7946 df-recs 8007 df-rdg 8045 df-1o 8101 df-2o 8102 df-oadd 8105 df-er 8288 df-map 8407 df-en 8509 df-dom 8510 df-sdom 8511 df-fin 8512 df-dju 9329 df-card 9367 df-pnf 10676 df-mnf 10677 df-xr 10678 df-ltxr 10679 df-le 10680 df-sub 10871 df-neg 10872 df-nn 11638 df-2 11699 df-3 11700 df-n0 11897 df-xnn0 11967 df-z 11981 df-uz 12243 df-rp 12389 df-fz 12892 df-fzo 13033 df-hash 13690 df-word 13861 df-lsw 13914 df-concat 13922 df-s1 13949 df-substr 14002 df-pfx 14032 df-s2 14209 df-edg 26832 df-upgr 26866 df-umgr 26867 df-usgr 26935 df-nbgr 27114 df-wwlks 27607 df-wwlksn 27608 df-clwwlk 27759 df-clwwlkn 27802 df-clwwlknon 27866 |
This theorem is referenced by: numclwwlk1 28139 |
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