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Mirrors > Home > MPE Home > Th. List > pthdepisspth | Structured version Visualization version GIF version |
Description: A path with different start and end points is a simple path (in an undirected graph). (Contributed by Alexander van der Vekens, 31-Oct-2017.) (Revised by AV, 12-Jan-2021.) (Proof shortened by AV, 30-Oct-2021.) |
Ref | Expression |
---|---|
pthdepisspth | ⊢ ((𝐹(Paths‘𝐺)𝑃 ∧ (𝑃‘0) ≠ (𝑃‘(♯‘𝐹))) → 𝐹(SPaths‘𝐺)𝑃) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | ispth 27992 | . . . 4 ⊢ (𝐹(Paths‘𝐺)𝑃 ↔ (𝐹(Trails‘𝐺)𝑃 ∧ Fun ◡(𝑃 ↾ (1..^(♯‘𝐹))) ∧ ((𝑃 “ {0, (♯‘𝐹)}) ∩ (𝑃 “ (1..^(♯‘𝐹)))) = ∅)) | |
2 | simplll 771 | . . . . . 6 ⊢ ((((𝐹(Trails‘𝐺)𝑃 ∧ Fun ◡(𝑃 ↾ (1..^(♯‘𝐹)))) ∧ ((𝑃 “ {0, (♯‘𝐹)}) ∩ (𝑃 “ (1..^(♯‘𝐹)))) = ∅) ∧ (𝑃‘0) ≠ (𝑃‘(♯‘𝐹))) → 𝐹(Trails‘𝐺)𝑃) | |
3 | trliswlk 27967 | . . . . . . . . 9 ⊢ (𝐹(Trails‘𝐺)𝑃 → 𝐹(Walks‘𝐺)𝑃) | |
4 | wlkcl 27885 | . . . . . . . . 9 ⊢ (𝐹(Walks‘𝐺)𝑃 → (♯‘𝐹) ∈ ℕ0) | |
5 | 3, 4 | syl 17 | . . . . . . . 8 ⊢ (𝐹(Trails‘𝐺)𝑃 → (♯‘𝐹) ∈ ℕ0) |
6 | 5 | ad3antrrr 726 | . . . . . . 7 ⊢ ((((𝐹(Trails‘𝐺)𝑃 ∧ Fun ◡(𝑃 ↾ (1..^(♯‘𝐹)))) ∧ ((𝑃 “ {0, (♯‘𝐹)}) ∩ (𝑃 “ (1..^(♯‘𝐹)))) = ∅) ∧ (𝑃‘0) ≠ (𝑃‘(♯‘𝐹))) → (♯‘𝐹) ∈ ℕ0) |
7 | eqid 2738 | . . . . . . . . . . 11 ⊢ (Vtx‘𝐺) = (Vtx‘𝐺) | |
8 | 7 | wlkp 27886 | . . . . . . . . . 10 ⊢ (𝐹(Walks‘𝐺)𝑃 → 𝑃:(0...(♯‘𝐹))⟶(Vtx‘𝐺)) |
9 | 3, 8 | syl 17 | . . . . . . . . 9 ⊢ (𝐹(Trails‘𝐺)𝑃 → 𝑃:(0...(♯‘𝐹))⟶(Vtx‘𝐺)) |
10 | 9 | ad3antrrr 726 | . . . . . . . 8 ⊢ ((((𝐹(Trails‘𝐺)𝑃 ∧ Fun ◡(𝑃 ↾ (1..^(♯‘𝐹)))) ∧ ((𝑃 “ {0, (♯‘𝐹)}) ∩ (𝑃 “ (1..^(♯‘𝐹)))) = ∅) ∧ (𝑃‘0) ≠ (𝑃‘(♯‘𝐹))) → 𝑃:(0...(♯‘𝐹))⟶(Vtx‘𝐺)) |
11 | simpllr 772 | . . . . . . . 8 ⊢ ((((𝐹(Trails‘𝐺)𝑃 ∧ Fun ◡(𝑃 ↾ (1..^(♯‘𝐹)))) ∧ ((𝑃 “ {0, (♯‘𝐹)}) ∩ (𝑃 “ (1..^(♯‘𝐹)))) = ∅) ∧ (𝑃‘0) ≠ (𝑃‘(♯‘𝐹))) → Fun ◡(𝑃 ↾ (1..^(♯‘𝐹)))) | |
12 | simpr 484 | . . . . . . . 8 ⊢ ((((𝐹(Trails‘𝐺)𝑃 ∧ Fun ◡(𝑃 ↾ (1..^(♯‘𝐹)))) ∧ ((𝑃 “ {0, (♯‘𝐹)}) ∩ (𝑃 “ (1..^(♯‘𝐹)))) = ∅) ∧ (𝑃‘0) ≠ (𝑃‘(♯‘𝐹))) → (𝑃‘0) ≠ (𝑃‘(♯‘𝐹))) | |
13 | 10, 11, 12 | 3jca 1126 | . . . . . . 7 ⊢ ((((𝐹(Trails‘𝐺)𝑃 ∧ Fun ◡(𝑃 ↾ (1..^(♯‘𝐹)))) ∧ ((𝑃 “ {0, (♯‘𝐹)}) ∩ (𝑃 “ (1..^(♯‘𝐹)))) = ∅) ∧ (𝑃‘0) ≠ (𝑃‘(♯‘𝐹))) → (𝑃:(0...(♯‘𝐹))⟶(Vtx‘𝐺) ∧ Fun ◡(𝑃 ↾ (1..^(♯‘𝐹))) ∧ (𝑃‘0) ≠ (𝑃‘(♯‘𝐹)))) |
14 | simplr 765 | . . . . . . 7 ⊢ ((((𝐹(Trails‘𝐺)𝑃 ∧ Fun ◡(𝑃 ↾ (1..^(♯‘𝐹)))) ∧ ((𝑃 “ {0, (♯‘𝐹)}) ∩ (𝑃 “ (1..^(♯‘𝐹)))) = ∅) ∧ (𝑃‘0) ≠ (𝑃‘(♯‘𝐹))) → ((𝑃 “ {0, (♯‘𝐹)}) ∩ (𝑃 “ (1..^(♯‘𝐹)))) = ∅) | |
15 | injresinj 13436 | . . . . . . 7 ⊢ ((♯‘𝐹) ∈ ℕ0 → ((𝑃:(0...(♯‘𝐹))⟶(Vtx‘𝐺) ∧ Fun ◡(𝑃 ↾ (1..^(♯‘𝐹))) ∧ (𝑃‘0) ≠ (𝑃‘(♯‘𝐹))) → (((𝑃 “ {0, (♯‘𝐹)}) ∩ (𝑃 “ (1..^(♯‘𝐹)))) = ∅ → Fun ◡𝑃))) | |
16 | 6, 13, 14, 15 | syl3c 66 | . . . . . 6 ⊢ ((((𝐹(Trails‘𝐺)𝑃 ∧ Fun ◡(𝑃 ↾ (1..^(♯‘𝐹)))) ∧ ((𝑃 “ {0, (♯‘𝐹)}) ∩ (𝑃 “ (1..^(♯‘𝐹)))) = ∅) ∧ (𝑃‘0) ≠ (𝑃‘(♯‘𝐹))) → Fun ◡𝑃) |
17 | 2, 16 | jca 511 | . . . . 5 ⊢ ((((𝐹(Trails‘𝐺)𝑃 ∧ Fun ◡(𝑃 ↾ (1..^(♯‘𝐹)))) ∧ ((𝑃 “ {0, (♯‘𝐹)}) ∩ (𝑃 “ (1..^(♯‘𝐹)))) = ∅) ∧ (𝑃‘0) ≠ (𝑃‘(♯‘𝐹))) → (𝐹(Trails‘𝐺)𝑃 ∧ Fun ◡𝑃)) |
18 | 17 | ex3 1344 | . . . 4 ⊢ ((𝐹(Trails‘𝐺)𝑃 ∧ Fun ◡(𝑃 ↾ (1..^(♯‘𝐹))) ∧ ((𝑃 “ {0, (♯‘𝐹)}) ∩ (𝑃 “ (1..^(♯‘𝐹)))) = ∅) → ((𝑃‘0) ≠ (𝑃‘(♯‘𝐹)) → (𝐹(Trails‘𝐺)𝑃 ∧ Fun ◡𝑃))) |
19 | 1, 18 | sylbi 216 | . . 3 ⊢ (𝐹(Paths‘𝐺)𝑃 → ((𝑃‘0) ≠ (𝑃‘(♯‘𝐹)) → (𝐹(Trails‘𝐺)𝑃 ∧ Fun ◡𝑃))) |
20 | 19 | imp 406 | . 2 ⊢ ((𝐹(Paths‘𝐺)𝑃 ∧ (𝑃‘0) ≠ (𝑃‘(♯‘𝐹))) → (𝐹(Trails‘𝐺)𝑃 ∧ Fun ◡𝑃)) |
21 | isspth 27993 | . 2 ⊢ (𝐹(SPaths‘𝐺)𝑃 ↔ (𝐹(Trails‘𝐺)𝑃 ∧ Fun ◡𝑃)) | |
22 | 20, 21 | sylibr 233 | 1 ⊢ ((𝐹(Paths‘𝐺)𝑃 ∧ (𝑃‘0) ≠ (𝑃‘(♯‘𝐹))) → 𝐹(SPaths‘𝐺)𝑃) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∧ wa 395 ∧ w3a 1085 = wceq 1539 ∈ wcel 2108 ≠ wne 2942 ∩ cin 3882 ∅c0 4253 {cpr 4560 class class class wbr 5070 ◡ccnv 5579 ↾ cres 5582 “ cima 5583 Fun wfun 6412 ⟶wf 6414 ‘cfv 6418 (class class class)co 7255 0cc0 10802 1c1 10803 ℕ0cn0 12163 ...cfz 13168 ..^cfzo 13311 ♯chash 13972 Vtxcvtx 27269 Walkscwlks 27866 Trailsctrls 27960 Pathscpths 27981 SPathscspths 27982 |
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-wlks 27869 df-trls 27962 df-pths 27985 df-spths 27986 |
This theorem is referenced by: pthisspthorcycl 32990 |
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