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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 30389 | . . . . . . . . . . . 12 ⊢ (𝑓(Cycles‘𝐺)𝑝 → 𝑓(Paths‘𝐺)𝑝) | |
| 2 | acycgrv.1 | . . . . . . . . . . . . 13 ⊢ 𝑉 = (Vtx‘𝐺) | |
| 3 | 2 | pthhashvtx 30320 | . . . . . . . . . . . 12 ⊢ (𝑓(Paths‘𝐺)𝑝 → (♯‘𝑓) ≤ (♯‘𝑉)) |
| 4 | 1, 3 | syl 18 | . . . . . . . . . . 11 ⊢ (𝑓(Cycles‘𝐺)𝑝 → (♯‘𝑓) ≤ (♯‘𝑉)) |
| 5 | 4 | adantr 486 | . . . . . . . . . 10 ⊢ ((𝑓(Cycles‘𝐺)𝑝 ∧ (♯‘𝑉) = 1) → (♯‘𝑓) ≤ (♯‘𝑉)) |
| 6 | breq2 5106 | . . . . . . . . . . 11 ⊢ ((♯‘𝑉) = 1 → ((♯‘𝑓) ≤ (♯‘𝑉) ↔ (♯‘𝑓) ≤ 1)) | |
| 7 | 6 | adantl 487 | . . . . . . . . . 10 ⊢ ((𝑓(Cycles‘𝐺)𝑝 ∧ (♯‘𝑉) = 1) → ((♯‘𝑓) ≤ (♯‘𝑉) ↔ (♯‘𝑓) ≤ 1)) |
| 8 | 5, 7 | mpbid 235 | . . . . . . . . 9 ⊢ ((𝑓(Cycles‘𝐺)𝑝 ∧ (♯‘𝑉) = 1) → (♯‘𝑓) ≤ 1) |
| 9 | 8 | 3adant1 1148 | . . . . . . . 8 ⊢ ((𝐺 ∈ UMGraph ∧ 𝑓(Cycles‘𝐺)𝑝 ∧ (♯‘𝑉) = 1) → (♯‘𝑓) ≤ 1) |
| 10 | umgrn1cycl 30401 | . . . . . . . . . 10 ⊢ ((𝐺 ∈ UMGraph ∧ 𝑓(Cycles‘𝐺)𝑝) → (♯‘𝑓) ≠ 1) | |
| 11 | 10 | 3adant3 1150 | . . . . . . . . 9 ⊢ ((𝐺 ∈ UMGraph ∧ 𝑓(Cycles‘𝐺)𝑝 ∧ (♯‘𝑉) = 1) → (♯‘𝑓) ≠ 1) |
| 12 | 11 | necomd 3010 | . . . . . . . 8 ⊢ ((𝐺 ∈ UMGraph ∧ 𝑓(Cycles‘𝐺)𝑝 ∧ (♯‘𝑉) = 1) → 1 ≠ (♯‘𝑓)) |
| 13 | cycliswlk 30391 | . . . . . . . . . 10 ⊢ (𝑓(Cycles‘𝐺)𝑝 → 𝑓(Walks‘𝐺)𝑝) | |
| 14 | wlkcl 30201 | . . . . . . . . . . . 12 ⊢ (𝑓(Walks‘𝐺)𝑝 → (♯‘𝑓) ∈ ℕ0) | |
| 15 | 14 | nn0red 12671 | . . . . . . . . . . 11 ⊢ (𝑓(Walks‘𝐺)𝑝 → (♯‘𝑓) ∈ ℝ) |
| 16 | 1red 11312 | . . . . . . . . . . 11 ⊢ (𝑓(Walks‘𝐺)𝑝 → 1 ∈ ℝ) | |
| 17 | 15, 16 | ltlend 11458 | . . . . . . . . . 10 ⊢ (𝑓(Walks‘𝐺)𝑝 → ((♯‘𝑓) < 1 ↔ ((♯‘𝑓) ≤ 1 ∧ 1 ≠ (♯‘𝑓)))) |
| 18 | 13, 17 | syl 18 | . . . . . . . . 9 ⊢ (𝑓(Cycles‘𝐺)𝑝 → ((♯‘𝑓) < 1 ↔ ((♯‘𝑓) ≤ 1 ∧ 1 ≠ (♯‘𝑓)))) |
| 19 | 18 | 3ad2ant2 1152 | . . . . . . . 8 ⊢ ((𝐺 ∈ UMGraph ∧ 𝑓(Cycles‘𝐺)𝑝 ∧ (♯‘𝑉) = 1) → ((♯‘𝑓) < 1 ↔ ((♯‘𝑓) ≤ 1 ∧ 1 ≠ (♯‘𝑓)))) |
| 20 | 9, 12, 19 | mpbir2and 726 | . . . . . . 7 ⊢ ((𝐺 ∈ UMGraph ∧ 𝑓(Cycles‘𝐺)𝑝 ∧ (♯‘𝑉) = 1) → (♯‘𝑓) < 1) |
| 21 | nn0lt10b 12764 | . . . . . . . . 9 ⊢ ((♯‘𝑓) ∈ ℕ0 → ((♯‘𝑓) < 1 ↔ (♯‘𝑓) = 0)) | |
| 22 | 13, 14, 21 | 3syl 19 | . . . . . . . 8 ⊢ (𝑓(Cycles‘𝐺)𝑝 → ((♯‘𝑓) < 1 ↔ (♯‘𝑓) = 0)) |
| 23 | 22 | 3ad2ant2 1152 | . . . . . . 7 ⊢ ((𝐺 ∈ UMGraph ∧ 𝑓(Cycles‘𝐺)𝑝 ∧ (♯‘𝑉) = 1) → ((♯‘𝑓) < 1 ↔ (♯‘𝑓) = 0)) |
| 24 | 20, 23 | mpbid 235 | . . . . . 6 ⊢ ((𝐺 ∈ UMGraph ∧ 𝑓(Cycles‘𝐺)𝑝 ∧ (♯‘𝑉) = 1) → (♯‘𝑓) = 0) |
| 25 | hasheq0 14510 | . . . . . . 7 ⊢ (𝑓 ∈ V → ((♯‘𝑓) = 0 ↔ 𝑓 = ∅)) | |
| 26 | 25 | elv 3455 | . . . . . 6 ⊢ ((♯‘𝑓) = 0 ↔ 𝑓 = ∅) |
| 27 | 24, 26 | sylib 221 | . . . . 5 ⊢ ((𝐺 ∈ UMGraph ∧ 𝑓(Cycles‘𝐺)𝑝 ∧ (♯‘𝑉) = 1) → 𝑓 = ∅) |
| 28 | 27 | 3com23 1144 | . . . 4 ⊢ ((𝐺 ∈ UMGraph ∧ (♯‘𝑉) = 1 ∧ 𝑓(Cycles‘𝐺)𝑝) → 𝑓 = ∅) |
| 29 | 28 | 3expia 1139 | . . 3 ⊢ ((𝐺 ∈ UMGraph ∧ (♯‘𝑉) = 1) → (𝑓(Cycles‘𝐺)𝑝 → 𝑓 = ∅)) |
| 30 | 29 | alrimivv 1960 | . 2 ⊢ ((𝐺 ∈ UMGraph ∧ (♯‘𝑉) = 1) → ∀𝑓∀𝑝(𝑓(Cycles‘𝐺)𝑝 → 𝑓 = ∅)) |
| 31 | isacycgr1 30757 | . . 3 ⊢ (𝐺 ∈ UMGraph → (𝐺 ∈ AcyclicGraph ↔ ∀𝑓∀𝑝(𝑓(Cycles‘𝐺)𝑝 → 𝑓 = ∅))) | |
| 32 | 31 | adantr 486 | . 2 ⊢ ((𝐺 ∈ UMGraph ∧ (♯‘𝑉) = 1) → (𝐺 ∈ AcyclicGraph ↔ ∀𝑓∀𝑝(𝑓(Cycles‘𝐺)𝑝 → 𝑓 = ∅))) |
| 33 | 30, 32 | mpbird 260 | 1 ⊢ ((𝐺 ∈ UMGraph ∧ (♯‘𝑉) = 1) → 𝐺 ∈ AcyclicGraph) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ↔ wb 209 ∧ wa 401 ∧ w3a 1103 ∀wal 1567 = wceq 1569 ∈ wcel 2144 ≠ wne 2955 Vcvv 3450 ∅c0 4278 class class class wbr 5102 ‘cfv 6538 0cc0 11203 1c1 11204 < clt 11346 ≤ cle 11347 ℕ0cn0 12609 ♯chash 14477 Vtxcvtx 29579 UMGraphcumgr 29664 Walkscwlks 30182 Pathscpths 30300 Cyclesccycls 30377 AcyclicGraphcacycgr 30753 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1827 ax-4 1841 ax-5 1942 ax-6 1999 ax-7 2040 ax-8 2146 ax-9 2154 ax-10 2177 ax-11 2193 ax-12 2212 ax-ext 2732 ax-rep 5231 ax-sep 5248 ax-nul 5259 ax-pow 5326 ax-pr 5390 ax-un 7751 ax-cnex 11259 ax-resscn 11260 ax-1cn 11261 ax-icn 11262 ax-addcl 11263 ax-addrcl 11264 ax-mulcl 11265 ax-mulrcl 11266 ax-mulcom 11267 ax-addass 11268 ax-mulass 11269 ax-distr 11270 ax-i2m1 11271 ax-1ne0 11272 ax-1rid 11273 ax-rnegex 11274 ax-rrecex 11275 ax-cnre 11276 ax-pre-lttri 11277 ax-pre-lttrn 11278 ax-pre-ltadd 11279 ax-pre-mulgt0 11280 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-ifp 1079 df-3or 1104 df-3an 1105 df-tru 1572 df-fal 1582 df-ex 1812 df-nf 1816 df-sb 2099 df-mo 2564 df-eu 2594 df-clab 2739 df-cleq 2752 df-clel 2835 df-nfc 2909 df-ne 2956 df-nel 3062 df-ral 3077 df-rex 3087 df-reu 3366 df-rab 3413 df-v 3452 df-sbc 3739 df-csb 3847 df-ss 3896 df-pss 4014 df-dif 4047 df-in 4091 df-un 4151 df-nul 4279 df-if 4482 df-pw 4558 df-sn 4585 df-pr 4587 df-op 4835 df-uni 4867 df-int 4907 df-iun 4952 df-br 5103 df-opab 5167 df-mpt 5186 df-tr 5212 df-id 5545 df-eprel 5550 df-po 5558 df-so 5559 df-fr 5603 df-we 5605 df-xp 5656 df-rel 5657 df-cnv 5658 df-co 5659 df-dm 5660 df-rn 5661 df-res 5662 df-ima 5663 df-pred 6304 df-ord 6365 df-on 6366 df-lim 6367 df-suc 6368 df-iota 6494 df-fun 6540 df-fn 6541 df-f 6542 df-f1 6543 df-fo 6544 df-f1o 6545 df-fv 6546 df-riota 7377 df-ov 7423 df-oprab 7424 df-mpo 7425 df-om 7878 df-1st 8001 df-2nd 8002 df-frecs 8302 df-wrecs 8333 df-recs 8382 df-rdg 8421 df-1o 8479 df-2o 8480 df-oadd 8483 df-er 8720 df-map 8852 df-pm 8853 df-en 8977 df-dom 8978 df-sdom 8979 df-fin 8980 df-dju 9985 df-card 10023 df-pnf 11348 df-mnf 11349 df-xr 11350 df-ltxr 11351 df-le 11352 df-sub 11546 df-neg 11547 df-nn 12339 df-2 12408 df-n0 12610 df-xnn0 12683 df-z 12697 df-uz 12969 df-fz 13643 df-fzo 13792 df-hash 14478 df-word 14662 df-upgr 29665 df-umgr 29666 df-wlks 30185 df-trls 30280 df-pths 30304 df-cycls 30379 df-acycgr 30754 |
| This theorem is used by: (None) |
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