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Mirrors > Home > MPE Home > Th. List > wlkonwlk1l | Structured version Visualization version GIF version |
Description: A walk is a walk from its first vertex to its last vertex. (Contributed by AV, 7-Feb-2021.) (Revised by AV, 22-Mar-2021.) |
Ref | Expression |
---|---|
wlkonwlk1l.w | ⊢ (𝜑 → 𝐹(Walks‘𝐺)𝑃) |
Ref | Expression |
---|---|
wlkonwlk1l | ⊢ (𝜑 → 𝐹((𝑃‘0)(WalksOn‘𝐺)(lastS‘𝑃))𝑃) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | wlkonwlk1l.w | . 2 ⊢ (𝜑 → 𝐹(Walks‘𝐺)𝑃) | |
2 | eqidd 2739 | . 2 ⊢ (𝜑 → (𝑃‘0) = (𝑃‘0)) | |
3 | wlklenvm1 27891 | . . . . 5 ⊢ (𝐹(Walks‘𝐺)𝑃 → (♯‘𝐹) = ((♯‘𝑃) − 1)) | |
4 | 3 | fveq2d 6760 | . . . 4 ⊢ (𝐹(Walks‘𝐺)𝑃 → (𝑃‘(♯‘𝐹)) = (𝑃‘((♯‘𝑃) − 1))) |
5 | eqid 2738 | . . . . . 6 ⊢ (Vtx‘𝐺) = (Vtx‘𝐺) | |
6 | 5 | wlkpwrd 27887 | . . . . 5 ⊢ (𝐹(Walks‘𝐺)𝑃 → 𝑃 ∈ Word (Vtx‘𝐺)) |
7 | lsw 14195 | . . . . 5 ⊢ (𝑃 ∈ Word (Vtx‘𝐺) → (lastS‘𝑃) = (𝑃‘((♯‘𝑃) − 1))) | |
8 | 6, 7 | syl 17 | . . . 4 ⊢ (𝐹(Walks‘𝐺)𝑃 → (lastS‘𝑃) = (𝑃‘((♯‘𝑃) − 1))) |
9 | 4, 8 | eqtr4d 2781 | . . 3 ⊢ (𝐹(Walks‘𝐺)𝑃 → (𝑃‘(♯‘𝐹)) = (lastS‘𝑃)) |
10 | 1, 9 | syl 17 | . 2 ⊢ (𝜑 → (𝑃‘(♯‘𝐹)) = (lastS‘𝑃)) |
11 | wlkcl 27885 | . . . . . . . 8 ⊢ (𝐹(Walks‘𝐺)𝑃 → (♯‘𝐹) ∈ ℕ0) | |
12 | nn0p1nn 12202 | . . . . . . . 8 ⊢ ((♯‘𝐹) ∈ ℕ0 → ((♯‘𝐹) + 1) ∈ ℕ) | |
13 | 11, 12 | syl 17 | . . . . . . 7 ⊢ (𝐹(Walks‘𝐺)𝑃 → ((♯‘𝐹) + 1) ∈ ℕ) |
14 | wlklenvp1 27888 | . . . . . . 7 ⊢ (𝐹(Walks‘𝐺)𝑃 → (♯‘𝑃) = ((♯‘𝐹) + 1)) | |
15 | 13, 6, 14 | jca32 515 | . . . . . 6 ⊢ (𝐹(Walks‘𝐺)𝑃 → (((♯‘𝐹) + 1) ∈ ℕ ∧ (𝑃 ∈ Word (Vtx‘𝐺) ∧ (♯‘𝑃) = ((♯‘𝐹) + 1)))) |
16 | fstwrdne0 14187 | . . . . . . 7 ⊢ ((((♯‘𝐹) + 1) ∈ ℕ ∧ (𝑃 ∈ Word (Vtx‘𝐺) ∧ (♯‘𝑃) = ((♯‘𝐹) + 1))) → (𝑃‘0) ∈ (Vtx‘𝐺)) | |
17 | lswlgt0cl 14200 | . . . . . . 7 ⊢ ((((♯‘𝐹) + 1) ∈ ℕ ∧ (𝑃 ∈ Word (Vtx‘𝐺) ∧ (♯‘𝑃) = ((♯‘𝐹) + 1))) → (lastS‘𝑃) ∈ (Vtx‘𝐺)) | |
18 | 16, 17 | jca 511 | . . . . . 6 ⊢ ((((♯‘𝐹) + 1) ∈ ℕ ∧ (𝑃 ∈ Word (Vtx‘𝐺) ∧ (♯‘𝑃) = ((♯‘𝐹) + 1))) → ((𝑃‘0) ∈ (Vtx‘𝐺) ∧ (lastS‘𝑃) ∈ (Vtx‘𝐺))) |
19 | 15, 18 | syl 17 | . . . . 5 ⊢ (𝐹(Walks‘𝐺)𝑃 → ((𝑃‘0) ∈ (Vtx‘𝐺) ∧ (lastS‘𝑃) ∈ (Vtx‘𝐺))) |
20 | eqid 2738 | . . . . . . 7 ⊢ (iEdg‘𝐺) = (iEdg‘𝐺) | |
21 | 20 | wlkf 27884 | . . . . . 6 ⊢ (𝐹(Walks‘𝐺)𝑃 → 𝐹 ∈ Word dom (iEdg‘𝐺)) |
22 | wrdv 14160 | . . . . . 6 ⊢ (𝐹 ∈ Word dom (iEdg‘𝐺) → 𝐹 ∈ Word V) | |
23 | 21, 22 | syl 17 | . . . . 5 ⊢ (𝐹(Walks‘𝐺)𝑃 → 𝐹 ∈ Word V) |
24 | 19, 23, 6 | jca32 515 | . . . 4 ⊢ (𝐹(Walks‘𝐺)𝑃 → (((𝑃‘0) ∈ (Vtx‘𝐺) ∧ (lastS‘𝑃) ∈ (Vtx‘𝐺)) ∧ (𝐹 ∈ Word V ∧ 𝑃 ∈ Word (Vtx‘𝐺)))) |
25 | 1, 24 | syl 17 | . . 3 ⊢ (𝜑 → (((𝑃‘0) ∈ (Vtx‘𝐺) ∧ (lastS‘𝑃) ∈ (Vtx‘𝐺)) ∧ (𝐹 ∈ Word V ∧ 𝑃 ∈ Word (Vtx‘𝐺)))) |
26 | 5 | iswlkon 27927 | . . 3 ⊢ ((((𝑃‘0) ∈ (Vtx‘𝐺) ∧ (lastS‘𝑃) ∈ (Vtx‘𝐺)) ∧ (𝐹 ∈ Word V ∧ 𝑃 ∈ Word (Vtx‘𝐺))) → (𝐹((𝑃‘0)(WalksOn‘𝐺)(lastS‘𝑃))𝑃 ↔ (𝐹(Walks‘𝐺)𝑃 ∧ (𝑃‘0) = (𝑃‘0) ∧ (𝑃‘(♯‘𝐹)) = (lastS‘𝑃)))) |
27 | 25, 26 | syl 17 | . 2 ⊢ (𝜑 → (𝐹((𝑃‘0)(WalksOn‘𝐺)(lastS‘𝑃))𝑃 ↔ (𝐹(Walks‘𝐺)𝑃 ∧ (𝑃‘0) = (𝑃‘0) ∧ (𝑃‘(♯‘𝐹)) = (lastS‘𝑃)))) |
28 | 1, 2, 10, 27 | mpbir3and 1340 | 1 ⊢ (𝜑 → 𝐹((𝑃‘0)(WalksOn‘𝐺)(lastS‘𝑃))𝑃) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 205 ∧ wa 395 ∧ w3a 1085 = wceq 1539 ∈ wcel 2108 Vcvv 3422 class class class wbr 5070 dom cdm 5580 ‘cfv 6418 (class class class)co 7255 0cc0 10802 1c1 10803 + caddc 10805 − cmin 11135 ℕcn 11903 ℕ0cn0 12163 ♯chash 13972 Word cword 14145 lastSclsw 14193 Vtxcvtx 27269 iEdgciedg 27270 Walkscwlks 27866 WalksOncwlkson 27867 |
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-ifp 1060 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-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-n0 12164 df-z 12250 df-uz 12512 df-fz 13169 df-fzo 13312 df-hash 13973 df-word 14146 df-lsw 14194 df-wlks 27869 df-wlkson 27870 |
This theorem is referenced by: 3wlkond 28436 |
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