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| Mirrors > Home > MPE Home > Th. List > cyclnspth | Structured version Visualization version GIF version | ||
| Description: A (non-trivial) cycle is not a simple path. (Contributed by Alexander van der Vekens, 30-Oct-2017.) (Revised by AV, 31-Jan-2021.) (Proof shortened by AV, 30-Oct-2021.) |
| Ref | Expression |
|---|---|
| cyclnspth | ⊢ (𝐹 ≠ ∅ → (𝐹(Cycles‘𝐺)𝑃 → ¬ 𝐹(SPaths‘𝐺)𝑃)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | iscycl 30387 | . . 3 ⊢ (𝐹(Cycles‘𝐺)𝑃 ↔ (𝐹(Paths‘𝐺)𝑃 ∧ (𝑃‘0) = (𝑃‘(♯‘𝐹)))) | |
| 2 | relpths 30312 | . . . . . . . . 9 ⊢ Rel (Paths‘𝐺) | |
| 3 | 2 | brrelex1i 5707 | . . . . . . . 8 ⊢ (𝐹(Paths‘𝐺)𝑃 → 𝐹 ∈ V) |
| 4 | hasheq0 14514 | . . . . . . . . . 10 ⊢ (𝐹 ∈ V → ((♯‘𝐹) = 0 ↔ 𝐹 = ∅)) | |
| 5 | 4 | necon3bid 2999 | . . . . . . . . 9 ⊢ (𝐹 ∈ V → ((♯‘𝐹) ≠ 0 ↔ 𝐹 ≠ ∅)) |
| 6 | 5 | bicomd 226 | . . . . . . . 8 ⊢ (𝐹 ∈ V → (𝐹 ≠ ∅ ↔ (♯‘𝐹) ≠ 0)) |
| 7 | 3, 6 | syl 18 | . . . . . . 7 ⊢ (𝐹(Paths‘𝐺)𝑃 → (𝐹 ≠ ∅ ↔ (♯‘𝐹) ≠ 0)) |
| 8 | 7 | biimpa 482 | . . . . . 6 ⊢ ((𝐹(Paths‘𝐺)𝑃 ∧ 𝐹 ≠ ∅) → (♯‘𝐹) ≠ 0) |
| 9 | spthdep 30329 | . . . . . . . 8 ⊢ ((𝐹(SPaths‘𝐺)𝑃 ∧ (♯‘𝐹) ≠ 0) → (𝑃‘0) ≠ (𝑃‘(♯‘𝐹))) | |
| 10 | 9 | neneqd 2960 | . . . . . . 7 ⊢ ((𝐹(SPaths‘𝐺)𝑃 ∧ (♯‘𝐹) ≠ 0) → ¬ (𝑃‘0) = (𝑃‘(♯‘𝐹))) |
| 11 | 10 | expcom 419 | . . . . . 6 ⊢ ((♯‘𝐹) ≠ 0 → (𝐹(SPaths‘𝐺)𝑃 → ¬ (𝑃‘0) = (𝑃‘(♯‘𝐹)))) |
| 12 | 8, 11 | syl 18 | . . . . 5 ⊢ ((𝐹(Paths‘𝐺)𝑃 ∧ 𝐹 ≠ ∅) → (𝐹(SPaths‘𝐺)𝑃 → ¬ (𝑃‘0) = (𝑃‘(♯‘𝐹)))) |
| 13 | 12 | con2d 135 | . . . 4 ⊢ ((𝐹(Paths‘𝐺)𝑃 ∧ 𝐹 ≠ ∅) → ((𝑃‘0) = (𝑃‘(♯‘𝐹)) → ¬ 𝐹(SPaths‘𝐺)𝑃)) |
| 14 | 13 | impancom 457 | . . 3 ⊢ ((𝐹(Paths‘𝐺)𝑃 ∧ (𝑃‘0) = (𝑃‘(♯‘𝐹))) → (𝐹 ≠ ∅ → ¬ 𝐹(SPaths‘𝐺)𝑃)) |
| 15 | 1, 14 | sylbi 220 | . 2 ⊢ (𝐹(Cycles‘𝐺)𝑃 → (𝐹 ≠ ∅ → ¬ 𝐹(SPaths‘𝐺)𝑃)) |
| 16 | 15 | com12 33 | 1 ⊢ (𝐹 ≠ ∅ → (𝐹(Cycles‘𝐺)𝑃 → ¬ 𝐹(SPaths‘𝐺)𝑃)) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: ¬ wn 3 → wi 4 ↔ wb 209 ∧ wa 401 = wceq 1569 ∈ wcel 2144 ≠ wne 2955 Vcvv 3450 ∅c0 4277 class class class wbr 5102 ‘cfv 6543 0cc0 11207 ♯chash 14481 Pathscpths 30304 SPathscspths 30305 Cyclesccycls 30381 |
| 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 5327 ax-pr 5391 ax-un 7755 ax-cnex 11263 ax-resscn 11264 ax-1cn 11265 ax-icn 11266 ax-addcl 11267 ax-addrcl 11268 ax-mulcl 11269 ax-mulrcl 11270 ax-mulcom 11271 ax-addass 11272 ax-mulass 11273 ax-distr 11274 ax-i2m1 11275 ax-1ne0 11276 ax-1rid 11277 ax-rnegex 11278 ax-rrecex 11279 ax-cnre 11280 ax-pre-lttri 11281 ax-pre-lttrn 11282 ax-pre-ltadd 11283 ax-pre-mulgt0 11284 |
| 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 3848 df-ss 3897 df-pss 4013 df-dif 4046 df-in 4090 df-un 4150 df-nul 4278 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 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 6307 df-ord 6368 df-on 6369 df-lim 6370 df-suc 6371 df-iota 6497 df-fun 6545 df-fn 6546 df-f 6547 df-f1 6548 df-fo 6549 df-f1o 6550 df-fv 6551 df-riota 7381 df-ov 7427 df-oprab 7428 df-mpo 7429 df-om 7882 df-1st 8005 df-2nd 8006 df-frecs 8307 df-wrecs 8338 df-recs 8387 df-rdg 8426 df-1o 8484 df-er 8725 df-map 8857 df-en 8982 df-dom 8983 df-sdom 8984 df-fin 8985 df-card 10027 df-pnf 11352 df-mnf 11353 df-xr 11354 df-ltxr 11355 df-le 11356 df-sub 11550 df-neg 11551 df-nn 12343 df-n0 12614 df-z 12701 df-uz 12973 df-fz 13647 df-fzo 13796 df-hash 14482 df-word 14666 df-wlks 30189 df-trls 30284 df-pths 30308 df-spths 30309 df-cycls 30383 |
| This theorem is used by: spthcycl 30401 |
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