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| Mirrors > Home > MPE Home > Th. List > Mathboxes > acycgr0v | Structured version Visualization version GIF version | ||
| Description: A null graph (with no vertices) is an acyclic graph. (Contributed by BTernaryTau, 11-Oct-2023.) |
| Ref | Expression |
|---|---|
| acycgr0v.1 | ⊢ 𝑉 = (Vtx‘𝐺) |
| Ref | Expression |
|---|---|
| acycgr0v | ⊢ ((𝐺 ∈ 𝑊 ∧ 𝑉 = ∅) → 𝐺 ∈ AcyclicGraph) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | br0 5154 | . . . . . 6 ⊢ ¬ 𝑓∅𝑝 | |
| 2 | df-cycls 30374 | . . . . . . . . . 10 ⊢ Cycles = (𝑔 ∈ V ↦ {〈𝑓, 𝑝〉 ∣ (𝑓(Paths‘𝑔)𝑝 ∧ (𝑝‘0) = (𝑝‘(♯‘𝑓)))}) | |
| 3 | 2 | relmptopab 7671 | . . . . . . . . 9 ⊢ Rel (Cycles‘𝐺) |
| 4 | cycliswlk 30386 | . . . . . . . . . 10 ⊢ (𝑓(Cycles‘𝐺)𝑝 → 𝑓(Walks‘𝐺)𝑝) | |
| 5 | df-br 5104 | . . . . . . . . . 10 ⊢ (𝑓(Cycles‘𝐺)𝑝 ↔ 〈𝑓, 𝑝〉 ∈ (Cycles‘𝐺)) | |
| 6 | df-br 5104 | . . . . . . . . . 10 ⊢ (𝑓(Walks‘𝐺)𝑝 ↔ 〈𝑓, 𝑝〉 ∈ (Walks‘𝐺)) | |
| 7 | 4, 5, 6 | 3imtr3i 294 | . . . . . . . . 9 ⊢ (〈𝑓, 𝑝〉 ∈ (Cycles‘𝐺) → 〈𝑓, 𝑝〉 ∈ (Walks‘𝐺)) |
| 8 | 3, 7 | relssi 5763 | . . . . . . . 8 ⊢ (Cycles‘𝐺) ⊆ (Walks‘𝐺) |
| 9 | acycgr0v.1 | . . . . . . . . . 10 ⊢ 𝑉 = (Vtx‘𝐺) | |
| 10 | 9 | eqeq1i 2766 | . . . . . . . . 9 ⊢ (𝑉 = ∅ ↔ (Vtx‘𝐺) = ∅) |
| 11 | g0wlk0 30231 | . . . . . . . . 9 ⊢ ((Vtx‘𝐺) = ∅ → (Walks‘𝐺) = ∅) | |
| 12 | 10, 11 | sylbi 220 | . . . . . . . 8 ⊢ (𝑉 = ∅ → (Walks‘𝐺) = ∅) |
| 13 | 8, 12 | sseqtrid 3973 | . . . . . . 7 ⊢ (𝑉 = ∅ → (Cycles‘𝐺) ⊆ ∅) |
| 14 | ss0 4352 | . . . . . . 7 ⊢ ((Cycles‘𝐺) ⊆ ∅ → (Cycles‘𝐺) = ∅) | |
| 15 | breq 5105 | . . . . . . . 8 ⊢ ((Cycles‘𝐺) = ∅ → (𝑓(Cycles‘𝐺)𝑝 ↔ 𝑓∅𝑝)) | |
| 16 | 15 | notbid 321 | . . . . . . 7 ⊢ ((Cycles‘𝐺) = ∅ → (¬ 𝑓(Cycles‘𝐺)𝑝 ↔ ¬ 𝑓∅𝑝)) |
| 17 | 13, 14, 16 | 3syl 19 | . . . . . 6 ⊢ (𝑉 = ∅ → (¬ 𝑓(Cycles‘𝐺)𝑝 ↔ ¬ 𝑓∅𝑝)) |
| 18 | 1, 17 | mpbiri 261 | . . . . 5 ⊢ (𝑉 = ∅ → ¬ 𝑓(Cycles‘𝐺)𝑝) |
| 19 | 18 | intnanrd 495 | . . . 4 ⊢ (𝑉 = ∅ → ¬ (𝑓(Cycles‘𝐺)𝑝 ∧ 𝑓 ≠ ∅)) |
| 20 | 19 | nexdv 1969 | . . 3 ⊢ (𝑉 = ∅ → ¬ ∃𝑝(𝑓(Cycles‘𝐺)𝑝 ∧ 𝑓 ≠ ∅)) |
| 21 | 20 | nexdv 1969 | . 2 ⊢ (𝑉 = ∅ → ¬ ∃𝑓∃𝑝(𝑓(Cycles‘𝐺)𝑝 ∧ 𝑓 ≠ ∅)) |
| 22 | isacycgr 30751 | . . 3 ⊢ (𝐺 ∈ 𝑊 → (𝐺 ∈ AcyclicGraph ↔ ¬ ∃𝑓∃𝑝(𝑓(Cycles‘𝐺)𝑝 ∧ 𝑓 ≠ ∅))) | |
| 23 | 22 | biimpar 483 | . 2 ⊢ ((𝐺 ∈ 𝑊 ∧ ¬ ∃𝑓∃𝑝(𝑓(Cycles‘𝐺)𝑝 ∧ 𝑓 ≠ ∅)) → 𝐺 ∈ AcyclicGraph) |
| 24 | 21, 23 | sylan2 605 | 1 ⊢ ((𝐺 ∈ 𝑊 ∧ 𝑉 = ∅) → 𝐺 ∈ AcyclicGraph) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: ¬ wn 3 → wi 4 ↔ wb 209 ∧ wa 401 = wceq 1570 ∃wex 1812 ∈ wcel 2145 ≠ wne 2956 Vcvv 3451 ⊆ wss 3899 ∅c0 4279 〈cop 4590 class class class wbr 5103 ‘cfv 6538 0cc0 11200 ♯chash 14474 Vtxcvtx 29574 Walkscwlks 30177 Pathscpths 30295 Cyclesccycls 30372 AcyclicGraphcacycgr 30748 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1943 ax-6 2000 ax-7 2041 ax-8 2147 ax-9 2155 ax-10 2178 ax-11 2194 ax-12 2213 ax-ext 2733 ax-rep 5232 ax-sep 5249 ax-nul 5260 ax-pow 5327 ax-pr 5391 ax-un 7751 ax-cnex 11256 ax-resscn 11257 ax-1cn 11258 ax-icn 11259 ax-addcl 11260 ax-addrcl 11261 ax-mulcl 11262 ax-mulrcl 11263 ax-mulcom 11264 ax-addass 11265 ax-mulass 11266 ax-distr 11267 ax-i2m1 11268 ax-1ne0 11269 ax-1rid 11270 ax-rnegex 11271 ax-rrecex 11272 ax-cnre 11273 ax-pre-lttri 11274 ax-pre-lttrn 11275 ax-pre-ltadd 11276 ax-pre-mulgt0 11277 |
| 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 1573 df-fal 1583 df-ex 1813 df-nf 1817 df-sb 2100 df-mo 2565 df-eu 2595 df-clab 2740 df-cleq 2753 df-clel 2836 df-nfc 2910 df-ne 2957 df-nel 3063 df-ral 3078 df-rex 3088 df-reu 3367 df-rab 3414 df-v 3453 df-sbc 3740 df-csb 3848 df-dif 3902 df-un 3904 df-in 3906 df-ss 3916 df-pss 3919 df-nul 4280 df-if 4483 df-pw 4559 df-sn 4585 df-pr 4587 df-op 4591 df-uni 4868 df-int 4908 df-iun 4953 df-br 5104 df-opab 5168 df-mpt 5187 df-tr 5213 df-id 5546 df-eprel 5551 df-po 5559 df-so 5560 df-fr 5604 df-we 5606 df-xp 5657 df-rel 5658 df-cnv 5659 df-co 5660 df-dm 5661 df-rn 5662 df-res 5663 df-ima 5664 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 8299 df-wrecs 8330 df-recs 8379 df-rdg 8418 df-1o 8476 df-er 8717 df-map 8849 df-en 8974 df-dom 8975 df-sdom 8976 df-fin 8977 df-card 10020 df-pnf 11345 df-mnf 11346 df-xr 11347 df-ltxr 11348 df-le 11349 df-sub 11543 df-neg 11544 df-nn 12336 df-n0 12607 df-z 12694 df-uz 12966 df-fz 13640 df-fzo 13789 df-hash 14475 df-word 14659 df-wlks 30180 df-trls 30275 df-pths 30299 df-cycls 30374 df-acycgr 30749 |
| This theorem is used by: (None) |
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