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| Mirrors > Home > MPE Home > Th. List > eucrct2eupth1 | Structured version Visualization version GIF version | ||
| Description: Removing one edge (𝐼‘(𝐹‘𝑁)) from a nonempty graph 𝐺 with an Eulerian circuit 〈𝐹, 𝑃〉 results in a graph 𝑆 with an Eulerian path 〈𝐻, 𝑄〉. This is the special case of eucrct2eupth 30537 (with 𝐽 = (𝑁 − 1)) where the last segment/edge of the circuit is removed. (Contributed by AV, 11-Mar-2021.) Hypothesis revised using the prefix operation. (Revised by AV, 30-Nov-2022.) |
| Ref | Expression |
|---|---|
| eucrct2eupth1.v | ⊢ 𝑉 = (Vtx‘𝐺) |
| eucrct2eupth1.i | ⊢ 𝐼 = (iEdg‘𝐺) |
| eucrct2eupth1.d | ⊢ (𝜑 → 𝐹(EulerPaths‘𝐺)𝑃) |
| eucrct2eupth1.c | ⊢ (𝜑 → 𝐹(Circuits‘𝐺)𝑃) |
| eucrct2eupth1.s | ⊢ (Vtx‘𝑆) = 𝑉 |
| eucrct2eupth1.g | ⊢ (𝜑 → 0 < (♯‘𝐹)) |
| eucrct2eupth1.n | ⊢ (𝜑 → 𝑁 = ((♯‘𝐹) − 1)) |
| eucrct2eupth1.e | ⊢ (𝜑 → (iEdg‘𝑆) = (𝐼 ↾ (𝐹 “ (0..^𝑁)))) |
| eucrct2eupth1.h | ⊢ 𝐻 = (𝐹 prefix 𝑁) |
| eucrct2eupth1.q | ⊢ 𝑄 = (𝑃 ↾ (0...𝑁)) |
| Ref | Expression |
|---|---|
| eucrct2eupth1 | ⊢ (𝜑 → 𝐻(EulerPaths‘𝑆)𝑄) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | eucrct2eupth1.v | . 2 ⊢ 𝑉 = (Vtx‘𝐺) | |
| 2 | eucrct2eupth1.i | . 2 ⊢ 𝐼 = (iEdg‘𝐺) | |
| 3 | eucrct2eupth1.d | . 2 ⊢ (𝜑 → 𝐹(EulerPaths‘𝐺)𝑃) | |
| 4 | eucrct2eupth1.n | . . 3 ⊢ (𝜑 → 𝑁 = ((♯‘𝐹) − 1)) | |
| 5 | eucrct2eupth1.g | . . . . 5 ⊢ (𝜑 → 0 < (♯‘𝐹)) | |
| 6 | eupthiswlk 30504 | . . . . . 6 ⊢ (𝐹(EulerPaths‘𝐺)𝑃 → 𝐹(Walks‘𝐺)𝑃) | |
| 7 | wlkcl 29906 | . . . . . 6 ⊢ (𝐹(Walks‘𝐺)𝑃 → (♯‘𝐹) ∈ ℕ0) | |
| 8 | nn0z 12615 | . . . . . . . . 9 ⊢ ((♯‘𝐹) ∈ ℕ0 → (♯‘𝐹) ∈ ℤ) | |
| 9 | 8 | anim1i 626 | . . . . . . . 8 ⊢ (((♯‘𝐹) ∈ ℕ0 ∧ 0 < (♯‘𝐹)) → ((♯‘𝐹) ∈ ℤ ∧ 0 < (♯‘𝐹))) |
| 10 | elnnz 12601 | . . . . . . . 8 ⊢ ((♯‘𝐹) ∈ ℕ ↔ ((♯‘𝐹) ∈ ℤ ∧ 0 < (♯‘𝐹))) | |
| 11 | 9, 10 | sylibr 237 | . . . . . . 7 ⊢ (((♯‘𝐹) ∈ ℕ0 ∧ 0 < (♯‘𝐹)) → (♯‘𝐹) ∈ ℕ) |
| 12 | 11 | ex 417 | . . . . . 6 ⊢ ((♯‘𝐹) ∈ ℕ0 → (0 < (♯‘𝐹) → (♯‘𝐹) ∈ ℕ)) |
| 13 | 3, 6, 7, 12 | 4syl 20 | . . . . 5 ⊢ (𝜑 → (0 < (♯‘𝐹) → (♯‘𝐹) ∈ ℕ)) |
| 14 | 5, 13 | mpd 16 | . . . 4 ⊢ (𝜑 → (♯‘𝐹) ∈ ℕ) |
| 15 | fzo0end 13787 | . . . 4 ⊢ ((♯‘𝐹) ∈ ℕ → ((♯‘𝐹) − 1) ∈ (0..^(♯‘𝐹))) | |
| 16 | 14, 15 | syl 18 | . . 3 ⊢ (𝜑 → ((♯‘𝐹) − 1) ∈ (0..^(♯‘𝐹))) |
| 17 | 4, 16 | eqeltrd 2869 | . 2 ⊢ (𝜑 → 𝑁 ∈ (0..^(♯‘𝐹))) |
| 18 | eucrct2eupth1.e | . 2 ⊢ (𝜑 → (iEdg‘𝑆) = (𝐼 ↾ (𝐹 “ (0..^𝑁)))) | |
| 19 | eucrct2eupth1.h | . 2 ⊢ 𝐻 = (𝐹 prefix 𝑁) | |
| 20 | eucrct2eupth1.q | . 2 ⊢ 𝑄 = (𝑃 ↾ (0...𝑁)) | |
| 21 | eucrct2eupth1.s | . 2 ⊢ (Vtx‘𝑆) = 𝑉 | |
| 22 | 1, 2, 3, 17, 18, 19, 20, 21 | eupthres 30507 | 1 ⊢ (𝜑 → 𝐻(EulerPaths‘𝑆)𝑄) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∧ wa 400 = wceq 1567 ∈ wcel 2149 class class class wbr 5113 ↾ cres 5664 “ cima 5665 ‘cfv 6537 (class class class)co 7411 0cc0 11100 1c1 11101 < clt 11243 − cmin 11441 ℕcn 12233 ℕ0cn0 12504 ℤcz 12591 ...cfz 13535 ..^cfzo 13682 ♯chash 14366 prefix cpfx 14708 Vtxcvtx 29287 iEdgciedg 29288 Walkscwlks 29887 Circuitsccrcts 30074 EulerPathsceupth 30489 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1822 ax-4 1836 ax-5 1937 ax-6 1994 ax-7 2035 ax-8 2151 ax-9 2159 ax-10 2182 ax-11 2198 ax-12 2219 ax-ext 2741 ax-rep 5242 ax-sep 5261 ax-nul 5271 ax-pow 5337 ax-pr 5405 ax-un 7733 ax-cnex 11156 ax-resscn 11157 ax-1cn 11158 ax-icn 11159 ax-addcl 11160 ax-addrcl 11161 ax-mulcl 11162 ax-mulrcl 11163 ax-mulcom 11164 ax-addass 11165 ax-mulass 11166 ax-distr 11167 ax-i2m1 11168 ax-1ne0 11169 ax-1rid 11170 ax-rnegex 11171 ax-rrecex 11172 ax-cnre 11173 ax-pre-lttri 11174 ax-pre-lttrn 11175 ax-pre-ltadd 11176 ax-pre-mulgt0 11177 |
| This theorem depends on definitions: df-bi 210 df-an 401 df-or 861 df-ifp 1077 df-3or 1102 df-3an 1103 df-tru 1570 df-fal 1580 df-ex 1807 df-nf 1811 df-sb 2098 df-mo 2573 df-eu 2603 df-clab 2748 df-cleq 2761 df-clel 2844 df-nfc 2918 df-ne 2965 df-nel 3071 df-ral 3086 df-rex 3096 df-reu 3377 df-rab 3424 df-v 3465 df-sbc 3754 df-csb 3862 df-dif 3916 df-un 3918 df-in 3920 df-ss 3930 df-pss 3933 df-nul 4295 df-if 4493 df-pw 4569 df-sn 4595 df-pr 4597 df-op 4601 df-uni 4877 df-int 4917 df-iun 4962 df-br 5114 df-opab 5178 df-mpt 5197 df-tr 5223 df-id 5557 df-eprel 5562 df-po 5570 df-so 5571 df-fr 5615 df-we 5617 df-xp 5668 df-rel 5669 df-cnv 5670 df-co 5671 df-dm 5672 df-rn 5673 df-res 5674 df-ima 5675 df-pred 6303 df-ord 6364 df-on 6365 df-lim 6366 df-suc 6367 df-iota 6493 df-fun 6539 df-fn 6540 df-f 6541 df-f1 6542 df-fo 6543 df-f1o 6544 df-fv 6545 df-riota 7368 df-ov 7414 df-oprab 7415 df-mpo 7416 df-om 7863 df-1st 7986 df-2nd 7987 df-frecs 8278 df-wrecs 8309 df-recs 8358 df-rdg 8397 df-1o 8453 df-er 8694 df-map 8826 df-pm 8827 df-en 8944 df-dom 8945 df-sdom 8946 df-fin 8947 df-card 9925 df-pnf 11245 df-mnf 11246 df-xr 11247 df-ltxr 11248 df-le 11249 df-sub 11443 df-neg 11444 df-nn 12234 df-n0 12505 df-z 12592 df-uz 12863 df-fz 13536 df-fzo 13683 df-hash 14367 df-word 14551 df-substr 14679 df-pfx 14709 df-wlks 29890 df-trls 29981 df-eupth 30490 |
| This theorem is referenced by: eucrct2eupth 30537 |
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