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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 30258 | . . 3 ⊢ (𝐹(Cycles‘𝐺)𝑃 ↔ (𝐹(Paths‘𝐺)𝑃 ∧ (𝑃‘0) = (𝑃‘(♯‘𝐹)))) | |
| 2 | relpths 30183 | . . . . . . . . 9 ⊢ Rel (Paths‘𝐺) | |
| 3 | 2 | brrelex1i 5711 | . . . . . . . 8 ⊢ (𝐹(Paths‘𝐺)𝑃 → 𝐹 ∈ V) |
| 4 | hasheq0 14428 | . . . . . . . . . 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 30200 | . . . . . . . 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 1570 ∈ wcel 2145 ≠ wne 2955 Vcvv 3450 ∅c0 4279 class class class wbr 5103 ‘cfv 6533 0cc0 11125 ♯chash 14395 Pathscpths 30175 SPathscspths 30176 Cyclesccycls 30252 |
| 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 2732 ax-rep 5232 ax-sep 5251 ax-nul 5263 ax-pow 5330 ax-pr 5398 ax-un 7737 ax-cnex 11181 ax-resscn 11182 ax-1cn 11183 ax-icn 11184 ax-addcl 11185 ax-addrcl 11186 ax-mulcl 11187 ax-mulrcl 11188 ax-mulcom 11189 ax-addass 11190 ax-mulass 11191 ax-distr 11192 ax-i2m1 11193 ax-1ne0 11194 ax-1rid 11195 ax-rnegex 11196 ax-rrecex 11197 ax-cnre 11198 ax-pre-lttri 11199 ax-pre-lttrn 11200 ax-pre-ltadd 11201 ax-pre-mulgt0 11202 |
| 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 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 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 5550 df-eprel 5555 df-po 5563 df-so 5564 df-fr 5608 df-we 5610 df-xp 5661 df-rel 5662 df-cnv 5663 df-co 5664 df-dm 5665 df-rn 5666 df-res 5667 df-ima 5668 df-pred 6299 df-ord 6360 df-on 6361 df-lim 6362 df-suc 6363 df-iota 6489 df-fun 6535 df-fn 6536 df-f 6537 df-f1 6538 df-fo 6539 df-f1o 6540 df-fv 6541 df-riota 7371 df-ov 7417 df-oprab 7418 df-mpo 7419 df-om 7864 df-1st 7987 df-2nd 7988 df-frecs 8281 df-wrecs 8312 df-recs 8361 df-rdg 8400 df-1o 8456 df-er 8697 df-map 8829 df-en 8954 df-dom 8955 df-sdom 8956 df-fin 8957 df-card 9945 df-pnf 11270 df-mnf 11271 df-xr 11272 df-ltxr 11273 df-le 11274 df-sub 11468 df-neg 11469 df-nn 12259 df-n0 12530 df-z 12617 df-uz 12889 df-fz 13563 df-fzo 13711 df-hash 14396 df-word 14580 df-wlks 30060 df-trls 30155 df-pths 30179 df-spths 30180 df-cycls 30254 |
| This theorem is used by: spthcycl 30272 |
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