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Mirrors > Home > MPE Home > Th. List > upgr2pthnlp | Structured version Visualization version GIF version |
Description: A path of length at least 2 in a pseudograph does not contain a loop. (Contributed by AV, 6-Feb-2021.) |
Ref | Expression |
---|---|
2pthnloop.i | ⊢ 𝐼 = (iEdg‘𝐺) |
Ref | Expression |
---|---|
upgr2pthnlp | ⊢ ((𝐺 ∈ UPGraph ∧ 𝐹(Paths‘𝐺)𝑃 ∧ 1 < (♯‘𝐹)) → ∀𝑖 ∈ (0..^(♯‘𝐹))(♯‘(𝐼‘(𝐹‘𝑖))) = 2) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 2pthnloop.i | . . . 4 ⊢ 𝐼 = (iEdg‘𝐺) | |
2 | 1 | 2pthnloop 28000 | . . 3 ⊢ ((𝐹(Paths‘𝐺)𝑃 ∧ 1 < (♯‘𝐹)) → ∀𝑖 ∈ (0..^(♯‘𝐹))2 ≤ (♯‘(𝐼‘(𝐹‘𝑖)))) |
3 | 2 | 3adant1 1128 | . 2 ⊢ ((𝐺 ∈ UPGraph ∧ 𝐹(Paths‘𝐺)𝑃 ∧ 1 < (♯‘𝐹)) → ∀𝑖 ∈ (0..^(♯‘𝐹))2 ≤ (♯‘(𝐼‘(𝐹‘𝑖)))) |
4 | pthiswlk 27996 | . . . . . . 7 ⊢ (𝐹(Paths‘𝐺)𝑃 → 𝐹(Walks‘𝐺)𝑃) | |
5 | 1 | wlkf 27884 | . . . . . . 7 ⊢ (𝐹(Walks‘𝐺)𝑃 → 𝐹 ∈ Word dom 𝐼) |
6 | simp2 1135 | . . . . . . . . . 10 ⊢ ((𝐹 ∈ Word dom 𝐼 ∧ 𝐺 ∈ UPGraph ∧ 𝑖 ∈ (0..^(♯‘𝐹))) → 𝐺 ∈ UPGraph) | |
7 | wrdsymbcl 14158 | . . . . . . . . . 10 ⊢ ((𝐹 ∈ Word dom 𝐼 ∧ 𝑖 ∈ (0..^(♯‘𝐹))) → (𝐹‘𝑖) ∈ dom 𝐼) | |
8 | 1 | upgrle2 27378 | . . . . . . . . . 10 ⊢ ((𝐺 ∈ UPGraph ∧ (𝐹‘𝑖) ∈ dom 𝐼) → (♯‘(𝐼‘(𝐹‘𝑖))) ≤ 2) |
9 | 6, 7, 8 | 3imp3i2an 1343 | . . . . . . . . 9 ⊢ ((𝐹 ∈ Word dom 𝐼 ∧ 𝐺 ∈ UPGraph ∧ 𝑖 ∈ (0..^(♯‘𝐹))) → (♯‘(𝐼‘(𝐹‘𝑖))) ≤ 2) |
10 | fvex 6769 | . . . . . . . . . . . . 13 ⊢ (𝐼‘(𝐹‘𝑖)) ∈ V | |
11 | hashxnn0 13981 | . . . . . . . . . . . . 13 ⊢ ((𝐼‘(𝐹‘𝑖)) ∈ V → (♯‘(𝐼‘(𝐹‘𝑖))) ∈ ℕ0*) | |
12 | xnn0xr 12240 | . . . . . . . . . . . . 13 ⊢ ((♯‘(𝐼‘(𝐹‘𝑖))) ∈ ℕ0* → (♯‘(𝐼‘(𝐹‘𝑖))) ∈ ℝ*) | |
13 | 10, 11, 12 | mp2b 10 | . . . . . . . . . . . 12 ⊢ (♯‘(𝐼‘(𝐹‘𝑖))) ∈ ℝ* |
14 | 2re 11977 | . . . . . . . . . . . . 13 ⊢ 2 ∈ ℝ | |
15 | 14 | rexri 10964 | . . . . . . . . . . . 12 ⊢ 2 ∈ ℝ* |
16 | 13, 15 | pm3.2i 470 | . . . . . . . . . . 11 ⊢ ((♯‘(𝐼‘(𝐹‘𝑖))) ∈ ℝ* ∧ 2 ∈ ℝ*) |
17 | xrletri3 12817 | . . . . . . . . . . 11 ⊢ (((♯‘(𝐼‘(𝐹‘𝑖))) ∈ ℝ* ∧ 2 ∈ ℝ*) → ((♯‘(𝐼‘(𝐹‘𝑖))) = 2 ↔ ((♯‘(𝐼‘(𝐹‘𝑖))) ≤ 2 ∧ 2 ≤ (♯‘(𝐼‘(𝐹‘𝑖)))))) | |
18 | 16, 17 | mp1i 13 | . . . . . . . . . 10 ⊢ ((𝐹 ∈ Word dom 𝐼 ∧ 𝐺 ∈ UPGraph ∧ 𝑖 ∈ (0..^(♯‘𝐹))) → ((♯‘(𝐼‘(𝐹‘𝑖))) = 2 ↔ ((♯‘(𝐼‘(𝐹‘𝑖))) ≤ 2 ∧ 2 ≤ (♯‘(𝐼‘(𝐹‘𝑖)))))) |
19 | 18 | biimprd 247 | . . . . . . . . 9 ⊢ ((𝐹 ∈ Word dom 𝐼 ∧ 𝐺 ∈ UPGraph ∧ 𝑖 ∈ (0..^(♯‘𝐹))) → (((♯‘(𝐼‘(𝐹‘𝑖))) ≤ 2 ∧ 2 ≤ (♯‘(𝐼‘(𝐹‘𝑖)))) → (♯‘(𝐼‘(𝐹‘𝑖))) = 2)) |
20 | 9, 19 | mpand 691 | . . . . . . . 8 ⊢ ((𝐹 ∈ Word dom 𝐼 ∧ 𝐺 ∈ UPGraph ∧ 𝑖 ∈ (0..^(♯‘𝐹))) → (2 ≤ (♯‘(𝐼‘(𝐹‘𝑖))) → (♯‘(𝐼‘(𝐹‘𝑖))) = 2)) |
21 | 20 | 3exp 1117 | . . . . . . 7 ⊢ (𝐹 ∈ Word dom 𝐼 → (𝐺 ∈ UPGraph → (𝑖 ∈ (0..^(♯‘𝐹)) → (2 ≤ (♯‘(𝐼‘(𝐹‘𝑖))) → (♯‘(𝐼‘(𝐹‘𝑖))) = 2)))) |
22 | 4, 5, 21 | 3syl 18 | . . . . . 6 ⊢ (𝐹(Paths‘𝐺)𝑃 → (𝐺 ∈ UPGraph → (𝑖 ∈ (0..^(♯‘𝐹)) → (2 ≤ (♯‘(𝐼‘(𝐹‘𝑖))) → (♯‘(𝐼‘(𝐹‘𝑖))) = 2)))) |
23 | 22 | impcom 407 | . . . . 5 ⊢ ((𝐺 ∈ UPGraph ∧ 𝐹(Paths‘𝐺)𝑃) → (𝑖 ∈ (0..^(♯‘𝐹)) → (2 ≤ (♯‘(𝐼‘(𝐹‘𝑖))) → (♯‘(𝐼‘(𝐹‘𝑖))) = 2))) |
24 | 23 | 3adant3 1130 | . . . 4 ⊢ ((𝐺 ∈ UPGraph ∧ 𝐹(Paths‘𝐺)𝑃 ∧ 1 < (♯‘𝐹)) → (𝑖 ∈ (0..^(♯‘𝐹)) → (2 ≤ (♯‘(𝐼‘(𝐹‘𝑖))) → (♯‘(𝐼‘(𝐹‘𝑖))) = 2))) |
25 | 24 | imp 406 | . . 3 ⊢ (((𝐺 ∈ UPGraph ∧ 𝐹(Paths‘𝐺)𝑃 ∧ 1 < (♯‘𝐹)) ∧ 𝑖 ∈ (0..^(♯‘𝐹))) → (2 ≤ (♯‘(𝐼‘(𝐹‘𝑖))) → (♯‘(𝐼‘(𝐹‘𝑖))) = 2)) |
26 | 25 | ralimdva 3102 | . 2 ⊢ ((𝐺 ∈ UPGraph ∧ 𝐹(Paths‘𝐺)𝑃 ∧ 1 < (♯‘𝐹)) → (∀𝑖 ∈ (0..^(♯‘𝐹))2 ≤ (♯‘(𝐼‘(𝐹‘𝑖))) → ∀𝑖 ∈ (0..^(♯‘𝐹))(♯‘(𝐼‘(𝐹‘𝑖))) = 2)) |
27 | 3, 26 | mpd 15 | 1 ⊢ ((𝐺 ∈ UPGraph ∧ 𝐹(Paths‘𝐺)𝑃 ∧ 1 < (♯‘𝐹)) → ∀𝑖 ∈ (0..^(♯‘𝐹))(♯‘(𝐼‘(𝐹‘𝑖))) = 2) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 205 ∧ wa 395 ∧ w3a 1085 = wceq 1539 ∈ wcel 2108 ∀wral 3063 Vcvv 3422 class class class wbr 5070 dom cdm 5580 ‘cfv 6418 (class class class)co 7255 0cc0 10802 1c1 10803 ℝ*cxr 10939 < clt 10940 ≤ cle 10941 2c2 11958 ℕ0*cxnn0 12235 ..^cfzo 13311 ♯chash 13972 Word cword 14145 iEdgciedg 27270 UPGraphcupgr 27353 Walkscwlks 27866 Pathscpths 27981 |
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-oadd 8271 df-er 8456 df-map 8575 df-pm 8576 df-en 8692 df-dom 8693 df-sdom 8694 df-fin 8695 df-dju 9590 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-n0 12164 df-xnn0 12236 df-z 12250 df-uz 12512 df-fz 13169 df-fzo 13312 df-hash 13973 df-word 14146 df-uhgr 27331 df-upgr 27355 df-wlks 27869 df-trls 27962 df-pths 27985 |
This theorem is referenced by: (None) |
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