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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 30378 | . . 3 ⊢ (𝐹(Cycles‘𝐺)𝑃 ↔ (𝐹(Paths‘𝐺)𝑃 ∧ (𝑃‘0) = (𝑃‘(♯‘𝐹)))) | |
| 2 | relpths 30303 | . . . . . . . . 9 ⊢ Rel (Paths‘𝐺) | |
| 3 | 2 | brrelex1i 5707 | . . . . . . . 8 ⊢ (𝐹(Paths‘𝐺)𝑃 → 𝐹 ∈ V) |
| 4 | hasheq0 14507 | . . . . . . . . . 10 ⊢ (𝐹 ∈ V → ((♯‘𝐹) = 0 ↔ 𝐹 = ∅)) | |
| 5 | 4 | necon3bid 3000 | . . . . . . . . 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 30320 | . . . . . . . 8 ⊢ ((𝐹(SPaths‘𝐺)𝑃 ∧ (♯‘𝐹) ≠ 0) → (𝑃‘0) ≠ (𝑃‘(♯‘𝐹))) | |
| 10 | 9 | neneqd 2961 | . . . . . . 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 2956 Vcvv 3451 ∅c0 4279 class class class wbr 5103 ‘cfv 6538 0cc0 11200 ♯chash 14474 Pathscpths 30295 SPathscspths 30296 Cyclesccycls 30372 |
| 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-spths 30300 df-cycls 30374 |
| This theorem is used by: spthcycl 30392 |
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