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| Mirrors > Home > ILE Home > Th. List > eupthvdres | GIF version | ||
| Description: The vertex degree remains the same for all vertices if the edges are restricted to the edges of an Eulerian path. (Contributed by Mario Carneiro, 8-Apr-2015.) (Revised by AV, 26-Feb-2021.) |
| Ref | Expression |
|---|---|
| eupthvdres.v | ⊢ 𝑉 = (Vtx‘𝐺) |
| eupthvdres.i | ⊢ 𝐼 = (iEdg‘𝐺) |
| eupthvdres.g | ⊢ (𝜑 → 𝐺 ∈ 𝑊) |
| eupthvdres.f | ⊢ (𝜑 → Fun 𝐼) |
| eupthvdres.p | ⊢ (𝜑 → 𝐹(EulerPaths‘𝐺)𝑃) |
| eupthvdres.h | ⊢ 𝐻 = 〈𝑉, (𝐼 ↾ (𝐹 “ (0..^(♯‘𝐹))))〉 |
| Ref | Expression |
|---|---|
| eupthvdres | ⊢ (𝜑 → (VtxDeg‘𝐻) = (VtxDeg‘𝐺)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | eupthvdres.g | . 2 ⊢ (𝜑 → 𝐺 ∈ 𝑊) | |
| 2 | eupthvdres.h | . . 3 ⊢ 𝐻 = 〈𝑉, (𝐼 ↾ (𝐹 “ (0..^(♯‘𝐹))))〉 | |
| 3 | eupthvdres.v | . . . . 5 ⊢ 𝑉 = (Vtx‘𝐺) | |
| 4 | vtxex 16000 | . . . . . 6 ⊢ (𝐺 ∈ 𝑊 → (Vtx‘𝐺) ∈ V) | |
| 5 | 1, 4 | syl 14 | . . . . 5 ⊢ (𝜑 → (Vtx‘𝐺) ∈ V) |
| 6 | 3, 5 | eqeltrid 2319 | . . . 4 ⊢ (𝜑 → 𝑉 ∈ V) |
| 7 | eupthvdres.i | . . . . . 6 ⊢ 𝐼 = (iEdg‘𝐺) | |
| 8 | iedgex 16001 | . . . . . . 7 ⊢ (𝐺 ∈ 𝑊 → (iEdg‘𝐺) ∈ V) | |
| 9 | 1, 8 | syl 14 | . . . . . 6 ⊢ (𝜑 → (iEdg‘𝐺) ∈ V) |
| 10 | 7, 9 | eqeltrid 2319 | . . . . 5 ⊢ (𝜑 → 𝐼 ∈ V) |
| 11 | resexg 5077 | . . . . 5 ⊢ (𝐼 ∈ V → (𝐼 ↾ (𝐹 “ (0..^(♯‘𝐹)))) ∈ V) | |
| 12 | 10, 11 | syl 14 | . . . 4 ⊢ (𝜑 → (𝐼 ↾ (𝐹 “ (0..^(♯‘𝐹)))) ∈ V) |
| 13 | opexg 4343 | . . . 4 ⊢ ((𝑉 ∈ V ∧ (𝐼 ↾ (𝐹 “ (0..^(♯‘𝐹)))) ∈ V) → 〈𝑉, (𝐼 ↾ (𝐹 “ (0..^(♯‘𝐹))))〉 ∈ V) | |
| 14 | 6, 12, 13 | syl2anc 411 | . . 3 ⊢ (𝜑 → 〈𝑉, (𝐼 ↾ (𝐹 “ (0..^(♯‘𝐹))))〉 ∈ V) |
| 15 | 2, 14 | eqeltrid 2319 | . 2 ⊢ (𝜑 → 𝐻 ∈ V) |
| 16 | 2 | fveq2i 5672 | . . . 4 ⊢ (Vtx‘𝐻) = (Vtx‘〈𝑉, (𝐼 ↾ (𝐹 “ (0..^(♯‘𝐹))))〉) |
| 17 | opvtxfv 16004 | . . . . 5 ⊢ ((𝑉 ∈ V ∧ (𝐼 ↾ (𝐹 “ (0..^(♯‘𝐹)))) ∈ V) → (Vtx‘〈𝑉, (𝐼 ↾ (𝐹 “ (0..^(♯‘𝐹))))〉) = 𝑉) | |
| 18 | 6, 12, 17 | syl2anc 411 | . . . 4 ⊢ (𝜑 → (Vtx‘〈𝑉, (𝐼 ↾ (𝐹 “ (0..^(♯‘𝐹))))〉) = 𝑉) |
| 19 | 16, 18 | eqtrid 2277 | . . 3 ⊢ (𝜑 → (Vtx‘𝐻) = 𝑉) |
| 20 | 19, 3 | eqtrdi 2281 | . 2 ⊢ (𝜑 → (Vtx‘𝐻) = (Vtx‘𝐺)) |
| 21 | 2 | fveq2i 5672 | . . . . 5 ⊢ (iEdg‘𝐻) = (iEdg‘〈𝑉, (𝐼 ↾ (𝐹 “ (0..^(♯‘𝐹))))〉) |
| 22 | opiedgfv 16007 | . . . . . 6 ⊢ ((𝑉 ∈ V ∧ (𝐼 ↾ (𝐹 “ (0..^(♯‘𝐹)))) ∈ V) → (iEdg‘〈𝑉, (𝐼 ↾ (𝐹 “ (0..^(♯‘𝐹))))〉) = (𝐼 ↾ (𝐹 “ (0..^(♯‘𝐹))))) | |
| 23 | 6, 12, 22 | syl2anc 411 | . . . . 5 ⊢ (𝜑 → (iEdg‘〈𝑉, (𝐼 ↾ (𝐹 “ (0..^(♯‘𝐹))))〉) = (𝐼 ↾ (𝐹 “ (0..^(♯‘𝐹))))) |
| 24 | 21, 23 | eqtrid 2277 | . . . 4 ⊢ (𝜑 → (iEdg‘𝐻) = (𝐼 ↾ (𝐹 “ (0..^(♯‘𝐹))))) |
| 25 | eupthvdres.p | . . . . . 6 ⊢ (𝜑 → 𝐹(EulerPaths‘𝐺)𝑃) | |
| 26 | 7 | eupthf1o 16432 | . . . . . 6 ⊢ (𝐹(EulerPaths‘𝐺)𝑃 → 𝐹:(0..^(♯‘𝐹))–1-1-onto→dom 𝐼) |
| 27 | f1ofo 5620 | . . . . . 6 ⊢ (𝐹:(0..^(♯‘𝐹))–1-1-onto→dom 𝐼 → 𝐹:(0..^(♯‘𝐹))–onto→dom 𝐼) | |
| 28 | foima 5594 | . . . . . 6 ⊢ (𝐹:(0..^(♯‘𝐹))–onto→dom 𝐼 → (𝐹 “ (0..^(♯‘𝐹))) = dom 𝐼) | |
| 29 | 25, 26, 27, 28 | 4syl 18 | . . . . 5 ⊢ (𝜑 → (𝐹 “ (0..^(♯‘𝐹))) = dom 𝐼) |
| 30 | 29 | reseq2d 5037 | . . . 4 ⊢ (𝜑 → (𝐼 ↾ (𝐹 “ (0..^(♯‘𝐹)))) = (𝐼 ↾ dom 𝐼)) |
| 31 | eupthvdres.f | . . . . . 6 ⊢ (𝜑 → Fun 𝐼) | |
| 32 | 31 | funfnd 5382 | . . . . 5 ⊢ (𝜑 → 𝐼 Fn dom 𝐼) |
| 33 | fnresdm 5466 | . . . . 5 ⊢ (𝐼 Fn dom 𝐼 → (𝐼 ↾ dom 𝐼) = 𝐼) | |
| 34 | 32, 33 | syl 14 | . . . 4 ⊢ (𝜑 → (𝐼 ↾ dom 𝐼) = 𝐼) |
| 35 | 24, 30, 34 | 3eqtrd 2269 | . . 3 ⊢ (𝜑 → (iEdg‘𝐻) = 𝐼) |
| 36 | 35, 7 | eqtrdi 2281 | . 2 ⊢ (𝜑 → (iEdg‘𝐻) = (iEdg‘𝐺)) |
| 37 | 1, 15, 20, 36 | vtxdeqd 16278 | 1 ⊢ (𝜑 → (VtxDeg‘𝐻) = (VtxDeg‘𝐺)) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 = wceq 1398 ∈ wcel 2203 Vcvv 2812 〈cop 3691 class class class wbr 4108 dom cdm 4748 ↾ cres 4750 “ cima 4751 Fun wfun 5345 Fn wfn 5346 –onto→wfo 5349 –1-1-onto→wf1o 5350 ‘cfv 5351 (class class class)co 6049 0cc0 8123 ..^cfzo 10472 ♯chash 11133 Vtxcvtx 15994 iEdgciedg 15995 VtxDegcvtxdg 16268 EulerPathsceupth 16424 |
| 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 619 ax-in2 620 ax-io 717 ax-5 1496 ax-7 1497 ax-gen 1498 ax-ie1 1542 ax-ie2 1543 ax-8 1553 ax-10 1554 ax-11 1555 ax-i12 1556 ax-bndl 1558 ax-4 1559 ax-17 1575 ax-i9 1579 ax-ial 1583 ax-i5r 1584 ax-13 2205 ax-14 2206 ax-ext 2214 ax-coll 4224 ax-sep 4227 ax-nul 4235 ax-pow 4286 ax-pr 4321 ax-un 4553 ax-setind 4658 ax-iinf 4709 ax-cnex 8214 ax-resscn 8215 ax-1cn 8216 ax-1re 8217 ax-icn 8218 ax-addcl 8219 ax-addrcl 8220 ax-mulcl 8221 ax-addcom 8223 ax-mulcom 8224 ax-addass 8225 ax-mulass 8226 ax-distr 8227 ax-i2m1 8228 ax-0lt1 8229 ax-1rid 8230 ax-0id 8231 ax-rnegex 8232 ax-cnre 8234 ax-pre-ltirr 8235 ax-pre-ltwlin 8236 ax-pre-lttrn 8237 ax-pre-apti 8238 ax-pre-ltadd 8239 |
| This theorem depends on definitions: df-bi 117 df-dc 843 df-ifp 987 df-3or 1006 df-3an 1007 df-tru 1401 df-fal 1404 df-nf 1510 df-sb 1812 df-eu 2083 df-mo 2084 df-clab 2219 df-cleq 2225 df-clel 2228 df-nfc 2373 df-ne 2413 df-nel 2508 df-ral 2525 df-rex 2526 df-reu 2527 df-rab 2529 df-v 2814 df-sbc 3042 df-csb 3138 df-dif 3212 df-un 3214 df-in 3216 df-ss 3223 df-nul 3508 df-if 3620 df-pw 3670 df-sn 3694 df-pr 3695 df-op 3697 df-uni 3914 df-int 3949 df-iun 3992 df-br 4109 df-opab 4171 df-mpt 4172 df-tr 4208 df-id 4413 df-iord 4486 df-on 4488 df-ilim 4489 df-suc 4491 df-iom 4712 df-xp 4754 df-rel 4755 df-cnv 4756 df-co 4757 df-dm 4758 df-rn 4759 df-res 4760 df-ima 4761 df-iota 5311 df-fun 5353 df-fn 5354 df-f 5355 df-f1 5356 df-fo 5357 df-f1o 5358 df-fv 5359 df-riota 6002 df-ov 6052 df-oprab 6053 df-mpo 6054 df-1st 6333 df-2nd 6334 df-recs 6535 df-frec 6621 df-1o 6646 df-er 6766 df-map 6883 df-en 6975 df-dom 6976 df-fin 6977 df-pnf 8306 df-mnf 8307 df-xr 8308 df-ltxr 8309 df-le 8310 df-sub 8442 df-neg 8443 df-inn 9234 df-2 9292 df-3 9293 df-4 9294 df-5 9295 df-6 9296 df-7 9297 df-8 9298 df-9 9299 df-n0 9493 df-z 9574 df-dec 9706 df-uz 9850 df-fz 10339 df-fzo 10473 df-ihash 11134 df-word 11218 df-ndx 13204 df-slot 13205 df-base 13207 df-edgf 15987 df-vtx 15996 df-iedg 15997 df-vtxdg 16269 df-wlks 16300 df-trls 16363 df-eupth 16425 |
| This theorem is referenced by: eupth2fi 16461 |
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