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| Mirrors > Home > ILE Home > Th. List > eupthfi | GIF version | ||
| Description: Any graph with an Eulerian path is of finite size, i.e. with a finite number of edges. (Contributed by Mario Carneiro, 7-Apr-2015.) (Revised by AV, 18-Feb-2021.) |
| Ref | Expression |
|---|---|
| iseupth.i | ⊢ 𝐼 = (iEdg‘𝐺) |
| Ref | Expression |
|---|---|
| eupthfi | ⊢ (𝐹(EulerPaths‘𝐺)𝑃 → dom 𝐼 ∈ Fin) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | 0z 9480 | . . 3 ⊢ 0 ∈ ℤ | |
| 2 | iseupth.i | . . . . . . 7 ⊢ 𝐼 = (iEdg‘𝐺) | |
| 3 | 2 | iseupth 16242 | . . . . . 6 ⊢ (𝐹(EulerPaths‘𝐺)𝑃 ↔ (𝐹(Trails‘𝐺)𝑃 ∧ 𝐹:(0..^(♯‘𝐹))–onto→dom 𝐼)) |
| 4 | 3 | simplbi 274 | . . . . 5 ⊢ (𝐹(EulerPaths‘𝐺)𝑃 → 𝐹(Trails‘𝐺)𝑃) |
| 5 | trliswlk 16181 | . . . . 5 ⊢ (𝐹(Trails‘𝐺)𝑃 → 𝐹(Walks‘𝐺)𝑃) | |
| 6 | wlkcl 16129 | . . . . 5 ⊢ (𝐹(Walks‘𝐺)𝑃 → (♯‘𝐹) ∈ ℕ0) | |
| 7 | 4, 5, 6 | 3syl 17 | . . . 4 ⊢ (𝐹(EulerPaths‘𝐺)𝑃 → (♯‘𝐹) ∈ ℕ0) |
| 8 | 7 | nn0zd 9590 | . . 3 ⊢ (𝐹(EulerPaths‘𝐺)𝑃 → (♯‘𝐹) ∈ ℤ) |
| 9 | fzofig 10684 | . . 3 ⊢ ((0 ∈ ℤ ∧ (♯‘𝐹) ∈ ℤ) → (0..^(♯‘𝐹)) ∈ Fin) | |
| 10 | 1, 8, 9 | sylancr 414 | . 2 ⊢ (𝐹(EulerPaths‘𝐺)𝑃 → (0..^(♯‘𝐹)) ∈ Fin) |
| 11 | 2 | eupthf1o 16245 | . . . 4 ⊢ (𝐹(EulerPaths‘𝐺)𝑃 → 𝐹:(0..^(♯‘𝐹))–1-1-onto→dom 𝐼) |
| 12 | f1oeng 6925 | . . . 4 ⊢ (((0..^(♯‘𝐹)) ∈ Fin ∧ 𝐹:(0..^(♯‘𝐹))–1-1-onto→dom 𝐼) → (0..^(♯‘𝐹)) ≈ dom 𝐼) | |
| 13 | 10, 11, 12 | syl2anc 411 | . . 3 ⊢ (𝐹(EulerPaths‘𝐺)𝑃 → (0..^(♯‘𝐹)) ≈ dom 𝐼) |
| 14 | 13 | ensymd 6952 | . 2 ⊢ (𝐹(EulerPaths‘𝐺)𝑃 → dom 𝐼 ≈ (0..^(♯‘𝐹))) |
| 15 | enfii 7056 | . 2 ⊢ (((0..^(♯‘𝐹)) ∈ Fin ∧ dom 𝐼 ≈ (0..^(♯‘𝐹))) → dom 𝐼 ∈ Fin) | |
| 16 | 10, 14, 15 | syl2anc 411 | 1 ⊢ (𝐹(EulerPaths‘𝐺)𝑃 → dom 𝐼 ∈ Fin) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 = wceq 1395 ∈ wcel 2200 class class class wbr 4086 dom cdm 4723 –onto→wfo 5322 –1-1-onto→wf1o 5323 ‘cfv 5324 (class class class)co 6013 ≈ cen 6902 Fincfn 6904 0cc0 8022 ℕ0cn0 9392 ℤcz 9469 ..^cfzo 10367 ♯chash 11027 iEdgciedg 15854 Walkscwlks 16114 Trailsctrls 16175 EulerPathsceupth 16237 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-in1 617 ax-in2 618 ax-io 714 ax-5 1493 ax-7 1494 ax-gen 1495 ax-ie1 1539 ax-ie2 1540 ax-8 1550 ax-10 1551 ax-11 1552 ax-i12 1553 ax-bndl 1555 ax-4 1556 ax-17 1572 ax-i9 1576 ax-ial 1580 ax-i5r 1581 ax-13 2202 ax-14 2203 ax-ext 2211 ax-coll 4202 ax-sep 4205 ax-nul 4213 ax-pow 4262 ax-pr 4297 ax-un 4528 ax-setind 4633 ax-iinf 4684 ax-cnex 8113 ax-resscn 8114 ax-1cn 8115 ax-1re 8116 ax-icn 8117 ax-addcl 8118 ax-addrcl 8119 ax-mulcl 8120 ax-addcom 8122 ax-mulcom 8123 ax-addass 8124 ax-mulass 8125 ax-distr 8126 ax-i2m1 8127 ax-0lt1 8128 ax-1rid 8129 ax-0id 8130 ax-rnegex 8131 ax-cnre 8133 ax-pre-ltirr 8134 ax-pre-ltwlin 8135 ax-pre-lttrn 8136 ax-pre-apti 8137 ax-pre-ltadd 8138 |
| This theorem depends on definitions: df-bi 117 df-dc 840 df-ifp 984 df-3or 1003 df-3an 1004 df-tru 1398 df-fal 1401 df-nf 1507 df-sb 1809 df-eu 2080 df-mo 2081 df-clab 2216 df-cleq 2222 df-clel 2225 df-nfc 2361 df-ne 2401 df-nel 2496 df-ral 2513 df-rex 2514 df-reu 2515 df-rab 2517 df-v 2802 df-sbc 3030 df-csb 3126 df-dif 3200 df-un 3202 df-in 3204 df-ss 3211 df-nul 3493 df-if 3604 df-pw 3652 df-sn 3673 df-pr 3674 df-op 3676 df-uni 3892 df-int 3927 df-iun 3970 df-br 4087 df-opab 4149 df-mpt 4150 df-tr 4186 df-id 4388 df-iord 4461 df-on 4463 df-ilim 4464 df-suc 4466 df-iom 4687 df-xp 4729 df-rel 4730 df-cnv 4731 df-co 4732 df-dm 4733 df-rn 4734 df-res 4735 df-ima 4736 df-iota 5284 df-fun 5326 df-fn 5327 df-f 5328 df-f1 5329 df-fo 5330 df-f1o 5331 df-fv 5332 df-riota 5966 df-ov 6016 df-oprab 6017 df-mpo 6018 df-1st 6298 df-2nd 6299 df-recs 6466 df-frec 6552 df-1o 6577 df-er 6697 df-map 6814 df-en 6905 df-dom 6906 df-fin 6907 df-pnf 8206 df-mnf 8207 df-xr 8208 df-ltxr 8209 df-le 8210 df-sub 8342 df-neg 8343 df-inn 9134 df-2 9192 df-3 9193 df-4 9194 df-5 9195 df-6 9196 df-7 9197 df-8 9198 df-9 9199 df-n0 9393 df-z 9470 df-dec 9602 df-uz 9746 df-fz 10234 df-fzo 10368 df-ihash 11028 df-word 11104 df-ndx 13075 df-slot 13076 df-base 13078 df-edgf 15846 df-vtx 15855 df-iedg 15856 df-wlks 16115 df-trls 16176 df-eupth 16238 |
| This theorem is referenced by: (None) |
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