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Mirrors > Home > MPE Home > Th. List > Mathboxes > acycgr1v | Structured version Visualization version GIF version |
Description: A multigraph with one vertex is an acyclic graph. (Contributed by BTernaryTau, 12-Oct-2023.) |
Ref | Expression |
---|---|
acycgrv.1 | ⊢ 𝑉 = (Vtx‘𝐺) |
Ref | Expression |
---|---|
acycgr1v | ⊢ ((𝐺 ∈ UMGraph ∧ (♯‘𝑉) = 1) → 𝐺 ∈ AcyclicGraph) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | cyclispth 28165 | . . . . . . . . . . . 12 ⊢ (𝑓(Cycles‘𝐺)𝑝 → 𝑓(Paths‘𝐺)𝑝) | |
2 | acycgrv.1 | . . . . . . . . . . . . 13 ⊢ 𝑉 = (Vtx‘𝐺) | |
3 | 2 | pthhashvtx 33089 | . . . . . . . . . . . 12 ⊢ (𝑓(Paths‘𝐺)𝑝 → (♯‘𝑓) ≤ (♯‘𝑉)) |
4 | 1, 3 | syl 17 | . . . . . . . . . . 11 ⊢ (𝑓(Cycles‘𝐺)𝑝 → (♯‘𝑓) ≤ (♯‘𝑉)) |
5 | 4 | adantr 481 | . . . . . . . . . 10 ⊢ ((𝑓(Cycles‘𝐺)𝑝 ∧ (♯‘𝑉) = 1) → (♯‘𝑓) ≤ (♯‘𝑉)) |
6 | breq2 5078 | . . . . . . . . . . 11 ⊢ ((♯‘𝑉) = 1 → ((♯‘𝑓) ≤ (♯‘𝑉) ↔ (♯‘𝑓) ≤ 1)) | |
7 | 6 | adantl 482 | . . . . . . . . . 10 ⊢ ((𝑓(Cycles‘𝐺)𝑝 ∧ (♯‘𝑉) = 1) → ((♯‘𝑓) ≤ (♯‘𝑉) ↔ (♯‘𝑓) ≤ 1)) |
8 | 5, 7 | mpbid 231 | . . . . . . . . 9 ⊢ ((𝑓(Cycles‘𝐺)𝑝 ∧ (♯‘𝑉) = 1) → (♯‘𝑓) ≤ 1) |
9 | 8 | 3adant1 1129 | . . . . . . . 8 ⊢ ((𝐺 ∈ UMGraph ∧ 𝑓(Cycles‘𝐺)𝑝 ∧ (♯‘𝑉) = 1) → (♯‘𝑓) ≤ 1) |
10 | umgrn1cycl 28172 | . . . . . . . . . 10 ⊢ ((𝐺 ∈ UMGraph ∧ 𝑓(Cycles‘𝐺)𝑝) → (♯‘𝑓) ≠ 1) | |
11 | 10 | 3adant3 1131 | . . . . . . . . 9 ⊢ ((𝐺 ∈ UMGraph ∧ 𝑓(Cycles‘𝐺)𝑝 ∧ (♯‘𝑉) = 1) → (♯‘𝑓) ≠ 1) |
12 | 11 | necomd 2999 | . . . . . . . 8 ⊢ ((𝐺 ∈ UMGraph ∧ 𝑓(Cycles‘𝐺)𝑝 ∧ (♯‘𝑉) = 1) → 1 ≠ (♯‘𝑓)) |
13 | cycliswlk 28166 | . . . . . . . . . 10 ⊢ (𝑓(Cycles‘𝐺)𝑝 → 𝑓(Walks‘𝐺)𝑝) | |
14 | wlkcl 27982 | . . . . . . . . . . . 12 ⊢ (𝑓(Walks‘𝐺)𝑝 → (♯‘𝑓) ∈ ℕ0) | |
15 | 14 | nn0red 12294 | . . . . . . . . . . 11 ⊢ (𝑓(Walks‘𝐺)𝑝 → (♯‘𝑓) ∈ ℝ) |
16 | 1red 10976 | . . . . . . . . . . 11 ⊢ (𝑓(Walks‘𝐺)𝑝 → 1 ∈ ℝ) | |
17 | 15, 16 | ltlend 11120 | . . . . . . . . . 10 ⊢ (𝑓(Walks‘𝐺)𝑝 → ((♯‘𝑓) < 1 ↔ ((♯‘𝑓) ≤ 1 ∧ 1 ≠ (♯‘𝑓)))) |
18 | 13, 17 | syl 17 | . . . . . . . . 9 ⊢ (𝑓(Cycles‘𝐺)𝑝 → ((♯‘𝑓) < 1 ↔ ((♯‘𝑓) ≤ 1 ∧ 1 ≠ (♯‘𝑓)))) |
19 | 18 | 3ad2ant2 1133 | . . . . . . . 8 ⊢ ((𝐺 ∈ UMGraph ∧ 𝑓(Cycles‘𝐺)𝑝 ∧ (♯‘𝑉) = 1) → ((♯‘𝑓) < 1 ↔ ((♯‘𝑓) ≤ 1 ∧ 1 ≠ (♯‘𝑓)))) |
20 | 9, 12, 19 | mpbir2and 710 | . . . . . . 7 ⊢ ((𝐺 ∈ UMGraph ∧ 𝑓(Cycles‘𝐺)𝑝 ∧ (♯‘𝑉) = 1) → (♯‘𝑓) < 1) |
21 | nn0lt10b 12382 | . . . . . . . . 9 ⊢ ((♯‘𝑓) ∈ ℕ0 → ((♯‘𝑓) < 1 ↔ (♯‘𝑓) = 0)) | |
22 | 13, 14, 21 | 3syl 18 | . . . . . . . 8 ⊢ (𝑓(Cycles‘𝐺)𝑝 → ((♯‘𝑓) < 1 ↔ (♯‘𝑓) = 0)) |
23 | 22 | 3ad2ant2 1133 | . . . . . . 7 ⊢ ((𝐺 ∈ UMGraph ∧ 𝑓(Cycles‘𝐺)𝑝 ∧ (♯‘𝑉) = 1) → ((♯‘𝑓) < 1 ↔ (♯‘𝑓) = 0)) |
24 | 20, 23 | mpbid 231 | . . . . . 6 ⊢ ((𝐺 ∈ UMGraph ∧ 𝑓(Cycles‘𝐺)𝑝 ∧ (♯‘𝑉) = 1) → (♯‘𝑓) = 0) |
25 | hasheq0 14078 | . . . . . . 7 ⊢ (𝑓 ∈ V → ((♯‘𝑓) = 0 ↔ 𝑓 = ∅)) | |
26 | 25 | elv 3438 | . . . . . 6 ⊢ ((♯‘𝑓) = 0 ↔ 𝑓 = ∅) |
27 | 24, 26 | sylib 217 | . . . . 5 ⊢ ((𝐺 ∈ UMGraph ∧ 𝑓(Cycles‘𝐺)𝑝 ∧ (♯‘𝑉) = 1) → 𝑓 = ∅) |
28 | 27 | 3com23 1125 | . . . 4 ⊢ ((𝐺 ∈ UMGraph ∧ (♯‘𝑉) = 1 ∧ 𝑓(Cycles‘𝐺)𝑝) → 𝑓 = ∅) |
29 | 28 | 3expia 1120 | . . 3 ⊢ ((𝐺 ∈ UMGraph ∧ (♯‘𝑉) = 1) → (𝑓(Cycles‘𝐺)𝑝 → 𝑓 = ∅)) |
30 | 29 | alrimivv 1931 | . 2 ⊢ ((𝐺 ∈ UMGraph ∧ (♯‘𝑉) = 1) → ∀𝑓∀𝑝(𝑓(Cycles‘𝐺)𝑝 → 𝑓 = ∅)) |
31 | isacycgr1 33108 | . . 3 ⊢ (𝐺 ∈ UMGraph → (𝐺 ∈ AcyclicGraph ↔ ∀𝑓∀𝑝(𝑓(Cycles‘𝐺)𝑝 → 𝑓 = ∅))) | |
32 | 31 | adantr 481 | . 2 ⊢ ((𝐺 ∈ UMGraph ∧ (♯‘𝑉) = 1) → (𝐺 ∈ AcyclicGraph ↔ ∀𝑓∀𝑝(𝑓(Cycles‘𝐺)𝑝 → 𝑓 = ∅))) |
33 | 30, 32 | mpbird 256 | 1 ⊢ ((𝐺 ∈ UMGraph ∧ (♯‘𝑉) = 1) → 𝐺 ∈ AcyclicGraph) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 205 ∧ wa 396 ∧ w3a 1086 ∀wal 1537 = wceq 1539 ∈ wcel 2106 ≠ wne 2943 Vcvv 3432 ∅c0 4256 class class class wbr 5074 ‘cfv 6433 0cc0 10871 1c1 10872 < clt 11009 ≤ cle 11010 ℕ0cn0 12233 ♯chash 14044 Vtxcvtx 27366 UMGraphcumgr 27451 Walkscwlks 27963 Pathscpths 28080 Cyclesccycls 28153 AcyclicGraphcacycgr 33104 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1798 ax-4 1812 ax-5 1913 ax-6 1971 ax-7 2011 ax-8 2108 ax-9 2116 ax-10 2137 ax-11 2154 ax-12 2171 ax-ext 2709 ax-rep 5209 ax-sep 5223 ax-nul 5230 ax-pow 5288 ax-pr 5352 ax-un 7588 ax-cnex 10927 ax-resscn 10928 ax-1cn 10929 ax-icn 10930 ax-addcl 10931 ax-addrcl 10932 ax-mulcl 10933 ax-mulrcl 10934 ax-mulcom 10935 ax-addass 10936 ax-mulass 10937 ax-distr 10938 ax-i2m1 10939 ax-1ne0 10940 ax-1rid 10941 ax-rnegex 10942 ax-rrecex 10943 ax-cnre 10944 ax-pre-lttri 10945 ax-pre-lttrn 10946 ax-pre-ltadd 10947 ax-pre-mulgt0 10948 |
This theorem depends on definitions: df-bi 206 df-an 397 df-or 845 df-ifp 1061 df-3or 1087 df-3an 1088 df-tru 1542 df-fal 1552 df-ex 1783 df-nf 1787 df-sb 2068 df-mo 2540 df-eu 2569 df-clab 2716 df-cleq 2730 df-clel 2816 df-nfc 2889 df-ne 2944 df-nel 3050 df-ral 3069 df-rex 3070 df-reu 3072 df-rab 3073 df-v 3434 df-sbc 3717 df-csb 3833 df-dif 3890 df-un 3892 df-in 3894 df-ss 3904 df-pss 3906 df-nul 4257 df-if 4460 df-pw 4535 df-sn 4562 df-pr 4564 df-op 4568 df-uni 4840 df-int 4880 df-iun 4926 df-br 5075 df-opab 5137 df-mpt 5158 df-tr 5192 df-id 5489 df-eprel 5495 df-po 5503 df-so 5504 df-fr 5544 df-we 5546 df-xp 5595 df-rel 5596 df-cnv 5597 df-co 5598 df-dm 5599 df-rn 5600 df-res 5601 df-ima 5602 df-pred 6202 df-ord 6269 df-on 6270 df-lim 6271 df-suc 6272 df-iota 6391 df-fun 6435 df-fn 6436 df-f 6437 df-f1 6438 df-fo 6439 df-f1o 6440 df-fv 6441 df-riota 7232 df-ov 7278 df-oprab 7279 df-mpo 7280 df-om 7713 df-1st 7831 df-2nd 7832 df-frecs 8097 df-wrecs 8128 df-recs 8202 df-rdg 8241 df-1o 8297 df-oadd 8301 df-er 8498 df-map 8617 df-pm 8618 df-en 8734 df-dom 8735 df-sdom 8736 df-fin 8737 df-dju 9659 df-card 9697 df-pnf 11011 df-mnf 11012 df-xr 11013 df-ltxr 11014 df-le 11015 df-sub 11207 df-neg 11208 df-nn 11974 df-2 12036 df-n0 12234 df-xnn0 12306 df-z 12320 df-uz 12583 df-fz 13240 df-fzo 13383 df-hash 14045 df-word 14218 df-upgr 27452 df-umgr 27453 df-wlks 27966 df-trls 28060 df-pths 28084 df-cycls 28155 df-acycgr 33105 |
This theorem is referenced by: (None) |
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