MPE Home Metamath Proof Explorer < Previous   Next >
Nearby theorems
Mirrors  >  Home  >  MPE Home  >  Th. List  >  frgrncvvdeqlem8 Structured version   Visualization version   GIF version

Theorem frgrncvvdeqlem8 30254
Description: Lemma 8 for frgrncvvdeq 30257. This corresponds to statement 2 in [Huneke] p. 1: "The map is one-to-one since z in N(x) is uniquely determined as the common neighbor of x and a(x)". (Contributed by Alexander van der Vekens, 23-Dec-2017.) (Revised by AV, 10-May-2021.) (Revised by AV, 30-Dec-2021.)
Hypotheses
Ref Expression
frgrncvvdeq.v1 𝑉 = (Vtx‘𝐺)
frgrncvvdeq.e 𝐸 = (Edg‘𝐺)
frgrncvvdeq.nx 𝐷 = (𝐺 NeighbVtx 𝑋)
frgrncvvdeq.ny 𝑁 = (𝐺 NeighbVtx 𝑌)
frgrncvvdeq.x (𝜑𝑋𝑉)
frgrncvvdeq.y (𝜑𝑌𝑉)
frgrncvvdeq.ne (𝜑𝑋𝑌)
frgrncvvdeq.xy (𝜑𝑌𝐷)
frgrncvvdeq.f (𝜑𝐺 ∈ FriendGraph )
frgrncvvdeq.a 𝐴 = (𝑥𝐷 ↦ (𝑦𝑁 {𝑥, 𝑦} ∈ 𝐸))
Assertion
Ref Expression
frgrncvvdeqlem8 (𝜑𝐴:𝐷1-1𝑁)
Distinct variable groups:   𝑦,𝐸   𝑦,𝐺   𝑦,𝑉   𝑦,𝑌   𝑥,𝑦,𝑁   𝑥,𝐷   𝑥,𝑁   𝜑,𝑥   𝑦,𝐷   𝑥,𝐸
Allowed substitution hints:   𝜑(𝑦)   𝐴(𝑥,𝑦)   𝐺(𝑥)   𝑉(𝑥)   𝑋(𝑥,𝑦)   𝑌(𝑥)

Proof of Theorem frgrncvvdeqlem8
Dummy variables 𝑢 𝑤 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 frgrncvvdeq.v1 . . 3 𝑉 = (Vtx‘𝐺)
2 frgrncvvdeq.e . . 3 𝐸 = (Edg‘𝐺)
3 frgrncvvdeq.nx . . 3 𝐷 = (𝐺 NeighbVtx 𝑋)
4 frgrncvvdeq.ny . . 3 𝑁 = (𝐺 NeighbVtx 𝑌)
5 frgrncvvdeq.x . . 3 (𝜑𝑋𝑉)
6 frgrncvvdeq.y . . 3 (𝜑𝑌𝑉)
7 frgrncvvdeq.ne . . 3 (𝜑𝑋𝑌)
8 frgrncvvdeq.xy . . 3 (𝜑𝑌𝐷)
9 frgrncvvdeq.f . . 3 (𝜑𝐺 ∈ FriendGraph )
10 frgrncvvdeq.a . . 3 𝐴 = (𝑥𝐷 ↦ (𝑦𝑁 {𝑥, 𝑦} ∈ 𝐸))
111, 2, 3, 4, 5, 6, 7, 8, 9, 10frgrncvvdeqlem4 30250 . 2 (𝜑𝐴:𝐷𝑁)
12 simpr 484 . . 3 ((𝜑𝐴:𝐷𝑁) → 𝐴:𝐷𝑁)
13 ffvelcdm 7015 . . . . . . . . 9 ((𝐴:𝐷𝑁𝑢𝐷) → (𝐴𝑢) ∈ 𝑁)
1413ad2ant2lr 748 . . . . . . . 8 (((𝜑𝐴:𝐷𝑁) ∧ (𝑢𝐷𝑤𝐷)) → (𝐴𝑢) ∈ 𝑁)
1514adantr 480 . . . . . . 7 ((((𝜑𝐴:𝐷𝑁) ∧ (𝑢𝐷𝑤𝐷)) ∧ (𝐴𝑢) = (𝐴𝑤)) → (𝐴𝑢) ∈ 𝑁)
161, 2, 3, 4, 5, 6, 7, 8, 9, 10frgrncvvdeqlem1 30247 . . . . . . . . . . 11 (𝜑𝑋𝑁)
17 preq1 4685 . . . . . . . . . . . . . . . . . . . . 21 (𝑥 = 𝑢 → {𝑥, 𝑦} = {𝑢, 𝑦})
1817eleq1d 2813 . . . . . . . . . . . . . . . . . . . 20 (𝑥 = 𝑢 → ({𝑥, 𝑦} ∈ 𝐸 ↔ {𝑢, 𝑦} ∈ 𝐸))
1918riotabidv 7308 . . . . . . . . . . . . . . . . . . 19 (𝑥 = 𝑢 → (𝑦𝑁 {𝑥, 𝑦} ∈ 𝐸) = (𝑦𝑁 {𝑢, 𝑦} ∈ 𝐸))
2019cbvmptv 5196 . . . . . . . . . . . . . . . . . 18 (𝑥𝐷 ↦ (𝑦𝑁 {𝑥, 𝑦} ∈ 𝐸)) = (𝑢𝐷 ↦ (𝑦𝑁 {𝑢, 𝑦} ∈ 𝐸))
2110, 20eqtri 2752 . . . . . . . . . . . . . . . . 17 𝐴 = (𝑢𝐷 ↦ (𝑦𝑁 {𝑢, 𝑦} ∈ 𝐸))
221, 2, 3, 4, 5, 6, 7, 8, 9, 21frgrncvvdeqlem6 30252 . . . . . . . . . . . . . . . 16 ((𝜑𝑢𝐷) → {𝑢, (𝐴𝑢)} ∈ 𝐸)
23 preq1 4685 . . . . . . . . . . . . . . . . . . . . 21 (𝑥 = 𝑤 → {𝑥, 𝑦} = {𝑤, 𝑦})
2423eleq1d 2813 . . . . . . . . . . . . . . . . . . . 20 (𝑥 = 𝑤 → ({𝑥, 𝑦} ∈ 𝐸 ↔ {𝑤, 𝑦} ∈ 𝐸))
2524riotabidv 7308 . . . . . . . . . . . . . . . . . . 19 (𝑥 = 𝑤 → (𝑦𝑁 {𝑥, 𝑦} ∈ 𝐸) = (𝑦𝑁 {𝑤, 𝑦} ∈ 𝐸))
2625cbvmptv 5196 . . . . . . . . . . . . . . . . . 18 (𝑥𝐷 ↦ (𝑦𝑁 {𝑥, 𝑦} ∈ 𝐸)) = (𝑤𝐷 ↦ (𝑦𝑁 {𝑤, 𝑦} ∈ 𝐸))
2710, 26eqtri 2752 . . . . . . . . . . . . . . . . 17 𝐴 = (𝑤𝐷 ↦ (𝑦𝑁 {𝑤, 𝑦} ∈ 𝐸))
281, 2, 3, 4, 5, 6, 7, 8, 9, 27frgrncvvdeqlem6 30252 . . . . . . . . . . . . . . . 16 ((𝜑𝑤𝐷) → {𝑤, (𝐴𝑤)} ∈ 𝐸)
2922, 28anim12dan 619 . . . . . . . . . . . . . . 15 ((𝜑 ∧ (𝑢𝐷𝑤𝐷)) → ({𝑢, (𝐴𝑢)} ∈ 𝐸 ∧ {𝑤, (𝐴𝑤)} ∈ 𝐸))
30 preq2 4686 . . . . . . . . . . . . . . . . . . . . . 22 ((𝐴𝑤) = (𝐴𝑢) → {𝑤, (𝐴𝑤)} = {𝑤, (𝐴𝑢)})
3130eleq1d 2813 . . . . . . . . . . . . . . . . . . . . 21 ((𝐴𝑤) = (𝐴𝑢) → ({𝑤, (𝐴𝑤)} ∈ 𝐸 ↔ {𝑤, (𝐴𝑢)} ∈ 𝐸))
3231anbi2d 630 . . . . . . . . . . . . . . . . . . . 20 ((𝐴𝑤) = (𝐴𝑢) → (({𝑢, (𝐴𝑢)} ∈ 𝐸 ∧ {𝑤, (𝐴𝑤)} ∈ 𝐸) ↔ ({𝑢, (𝐴𝑢)} ∈ 𝐸 ∧ {𝑤, (𝐴𝑢)} ∈ 𝐸)))
3332eqcoms 2737 . . . . . . . . . . . . . . . . . . 19 ((𝐴𝑢) = (𝐴𝑤) → (({𝑢, (𝐴𝑢)} ∈ 𝐸 ∧ {𝑤, (𝐴𝑤)} ∈ 𝐸) ↔ ({𝑢, (𝐴𝑢)} ∈ 𝐸 ∧ {𝑤, (𝐴𝑢)} ∈ 𝐸)))
3433biimpa 476 . . . . . . . . . . . . . . . . . 18 (((𝐴𝑢) = (𝐴𝑤) ∧ ({𝑢, (𝐴𝑢)} ∈ 𝐸 ∧ {𝑤, (𝐴𝑤)} ∈ 𝐸)) → ({𝑢, (𝐴𝑢)} ∈ 𝐸 ∧ {𝑤, (𝐴𝑢)} ∈ 𝐸))
35 df-ne 2926 . . . . . . . . . . . . . . . . . . 19 (𝑢𝑤 ↔ ¬ 𝑢 = 𝑤)
362, 3frgrnbnb 30241 . . . . . . . . . . . . . . . . . . . . . . . 24 ((𝐺 ∈ FriendGraph ∧ (𝑢𝐷𝑤𝐷) ∧ 𝑢𝑤) → (({𝑢, (𝐴𝑢)} ∈ 𝐸 ∧ {𝑤, (𝐴𝑢)} ∈ 𝐸) → (𝐴𝑢) = 𝑋))
379, 36syl3an1 1163 . . . . . . . . . . . . . . . . . . . . . . 23 ((𝜑 ∧ (𝑢𝐷𝑤𝐷) ∧ 𝑢𝑤) → (({𝑢, (𝐴𝑢)} ∈ 𝐸 ∧ {𝑤, (𝐴𝑢)} ∈ 𝐸) → (𝐴𝑢) = 𝑋))
38373expa 1118 . . . . . . . . . . . . . . . . . . . . . 22 (((𝜑 ∧ (𝑢𝐷𝑤𝐷)) ∧ 𝑢𝑤) → (({𝑢, (𝐴𝑢)} ∈ 𝐸 ∧ {𝑤, (𝐴𝑢)} ∈ 𝐸) → (𝐴𝑢) = 𝑋))
39 df-nel 3030 . . . . . . . . . . . . . . . . . . . . . . . 24 (𝑋𝑁 ↔ ¬ 𝑋𝑁)
40 eleq1 2816 . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 ((𝐴𝑢) = 𝑋 → ((𝐴𝑢) ∈ 𝑁𝑋𝑁))
4140biimpa 476 . . . . . . . . . . . . . . . . . . . . . . . . . . 27 (((𝐴𝑢) = 𝑋 ∧ (𝐴𝑢) ∈ 𝑁) → 𝑋𝑁)
4241pm2.24d 151 . . . . . . . . . . . . . . . . . . . . . . . . . 26 (((𝐴𝑢) = 𝑋 ∧ (𝐴𝑢) ∈ 𝑁) → (¬ 𝑋𝑁𝑢 = 𝑤))
4342expcom 413 . . . . . . . . . . . . . . . . . . . . . . . . 25 ((𝐴𝑢) ∈ 𝑁 → ((𝐴𝑢) = 𝑋 → (¬ 𝑋𝑁𝑢 = 𝑤)))
4443com13 88 . . . . . . . . . . . . . . . . . . . . . . . 24 𝑋𝑁 → ((𝐴𝑢) = 𝑋 → ((𝐴𝑢) ∈ 𝑁𝑢 = 𝑤)))
4539, 44sylbi 217 . . . . . . . . . . . . . . . . . . . . . . 23 (𝑋𝑁 → ((𝐴𝑢) = 𝑋 → ((𝐴𝑢) ∈ 𝑁𝑢 = 𝑤)))
4645com12 32 . . . . . . . . . . . . . . . . . . . . . 22 ((𝐴𝑢) = 𝑋 → (𝑋𝑁 → ((𝐴𝑢) ∈ 𝑁𝑢 = 𝑤)))
4738, 46syl6 35 . . . . . . . . . . . . . . . . . . . . 21 (((𝜑 ∧ (𝑢𝐷𝑤𝐷)) ∧ 𝑢𝑤) → (({𝑢, (𝐴𝑢)} ∈ 𝐸 ∧ {𝑤, (𝐴𝑢)} ∈ 𝐸) → (𝑋𝑁 → ((𝐴𝑢) ∈ 𝑁𝑢 = 𝑤))))
4847expcom 413 . . . . . . . . . . . . . . . . . . . 20 (𝑢𝑤 → ((𝜑 ∧ (𝑢𝐷𝑤𝐷)) → (({𝑢, (𝐴𝑢)} ∈ 𝐸 ∧ {𝑤, (𝐴𝑢)} ∈ 𝐸) → (𝑋𝑁 → ((𝐴𝑢) ∈ 𝑁𝑢 = 𝑤)))))
4948com23 86 . . . . . . . . . . . . . . . . . . 19 (𝑢𝑤 → (({𝑢, (𝐴𝑢)} ∈ 𝐸 ∧ {𝑤, (𝐴𝑢)} ∈ 𝐸) → ((𝜑 ∧ (𝑢𝐷𝑤𝐷)) → (𝑋𝑁 → ((𝐴𝑢) ∈ 𝑁𝑢 = 𝑤)))))
5035, 49sylbir 235 . . . . . . . . . . . . . . . . . 18 𝑢 = 𝑤 → (({𝑢, (𝐴𝑢)} ∈ 𝐸 ∧ {𝑤, (𝐴𝑢)} ∈ 𝐸) → ((𝜑 ∧ (𝑢𝐷𝑤𝐷)) → (𝑋𝑁 → ((𝐴𝑢) ∈ 𝑁𝑢 = 𝑤)))))
5134, 50syl5com 31 . . . . . . . . . . . . . . . . 17 (((𝐴𝑢) = (𝐴𝑤) ∧ ({𝑢, (𝐴𝑢)} ∈ 𝐸 ∧ {𝑤, (𝐴𝑤)} ∈ 𝐸)) → (¬ 𝑢 = 𝑤 → ((𝜑 ∧ (𝑢𝐷𝑤𝐷)) → (𝑋𝑁 → ((𝐴𝑢) ∈ 𝑁𝑢 = 𝑤)))))
5251expcom 413 . . . . . . . . . . . . . . . 16 (({𝑢, (𝐴𝑢)} ∈ 𝐸 ∧ {𝑤, (𝐴𝑤)} ∈ 𝐸) → ((𝐴𝑢) = (𝐴𝑤) → (¬ 𝑢 = 𝑤 → ((𝜑 ∧ (𝑢𝐷𝑤𝐷)) → (𝑋𝑁 → ((𝐴𝑢) ∈ 𝑁𝑢 = 𝑤))))))
5352com24 95 . . . . . . . . . . . . . . 15 (({𝑢, (𝐴𝑢)} ∈ 𝐸 ∧ {𝑤, (𝐴𝑤)} ∈ 𝐸) → ((𝜑 ∧ (𝑢𝐷𝑤𝐷)) → (¬ 𝑢 = 𝑤 → ((𝐴𝑢) = (𝐴𝑤) → (𝑋𝑁 → ((𝐴𝑢) ∈ 𝑁𝑢 = 𝑤))))))
5429, 53mpcom 38 . . . . . . . . . . . . . 14 ((𝜑 ∧ (𝑢𝐷𝑤𝐷)) → (¬ 𝑢 = 𝑤 → ((𝐴𝑢) = (𝐴𝑤) → (𝑋𝑁 → ((𝐴𝑢) ∈ 𝑁𝑢 = 𝑤)))))
5554ex 412 . . . . . . . . . . . . 13 (𝜑 → ((𝑢𝐷𝑤𝐷) → (¬ 𝑢 = 𝑤 → ((𝐴𝑢) = (𝐴𝑤) → (𝑋𝑁 → ((𝐴𝑢) ∈ 𝑁𝑢 = 𝑤))))))
5655com3r 87 . . . . . . . . . . . 12 𝑢 = 𝑤 → (𝜑 → ((𝑢𝐷𝑤𝐷) → ((𝐴𝑢) = (𝐴𝑤) → (𝑋𝑁 → ((𝐴𝑢) ∈ 𝑁𝑢 = 𝑤))))))
5756com15 101 . . . . . . . . . . 11 (𝑋𝑁 → (𝜑 → ((𝑢𝐷𝑤𝐷) → ((𝐴𝑢) = (𝐴𝑤) → (¬ 𝑢 = 𝑤 → ((𝐴𝑢) ∈ 𝑁𝑢 = 𝑤))))))
5816, 57mpcom 38 . . . . . . . . . 10 (𝜑 → ((𝑢𝐷𝑤𝐷) → ((𝐴𝑢) = (𝐴𝑤) → (¬ 𝑢 = 𝑤 → ((𝐴𝑢) ∈ 𝑁𝑢 = 𝑤)))))
5958expd 415 . . . . . . . . 9 (𝜑 → (𝑢𝐷 → (𝑤𝐷 → ((𝐴𝑢) = (𝐴𝑤) → (¬ 𝑢 = 𝑤 → ((𝐴𝑢) ∈ 𝑁𝑢 = 𝑤))))))
6059adantr 480 . . . . . . . 8 ((𝜑𝐴:𝐷𝑁) → (𝑢𝐷 → (𝑤𝐷 → ((𝐴𝑢) = (𝐴𝑤) → (¬ 𝑢 = 𝑤 → ((𝐴𝑢) ∈ 𝑁𝑢 = 𝑤))))))
6160imp42 426 . . . . . . 7 ((((𝜑𝐴:𝐷𝑁) ∧ (𝑢𝐷𝑤𝐷)) ∧ (𝐴𝑢) = (𝐴𝑤)) → (¬ 𝑢 = 𝑤 → ((𝐴𝑢) ∈ 𝑁𝑢 = 𝑤)))
6215, 61mpid 44 . . . . . 6 ((((𝜑𝐴:𝐷𝑁) ∧ (𝑢𝐷𝑤𝐷)) ∧ (𝐴𝑢) = (𝐴𝑤)) → (¬ 𝑢 = 𝑤𝑢 = 𝑤))
6362pm2.18d 127 . . . . 5 ((((𝜑𝐴:𝐷𝑁) ∧ (𝑢𝐷𝑤𝐷)) ∧ (𝐴𝑢) = (𝐴𝑤)) → 𝑢 = 𝑤)
6463ex 412 . . . 4 (((𝜑𝐴:𝐷𝑁) ∧ (𝑢𝐷𝑤𝐷)) → ((𝐴𝑢) = (𝐴𝑤) → 𝑢 = 𝑤))
6564ralrimivva 3172 . . 3 ((𝜑𝐴:𝐷𝑁) → ∀𝑢𝐷𝑤𝐷 ((𝐴𝑢) = (𝐴𝑤) → 𝑢 = 𝑤))
66 dff13 7191 . . 3 (𝐴:𝐷1-1𝑁 ↔ (𝐴:𝐷𝑁 ∧ ∀𝑢𝐷𝑤𝐷 ((𝐴𝑢) = (𝐴𝑤) → 𝑢 = 𝑤)))
6712, 65, 66sylanbrc 583 . 2 ((𝜑𝐴:𝐷𝑁) → 𝐴:𝐷1-1𝑁)
6811, 67mpdan 687 1 (𝜑𝐴:𝐷1-1𝑁)
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wi 4  wb 206  wa 395   = wceq 1540  wcel 2109  wne 2925  wnel 3029  wral 3044  {cpr 4579  cmpt 5173  wf 6478  1-1wf1 6479  cfv 6482  crio 7305  (class class class)co 7349  Vtxcvtx 28945  Edgcedg 28996   NeighbVtx cnbgr 29281   FriendGraph cfrgr 30206
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1795  ax-4 1809  ax-5 1910  ax-6 1967  ax-7 2008  ax-8 2111  ax-9 2119  ax-10 2142  ax-11 2158  ax-12 2178  ax-ext 2701  ax-sep 5235  ax-nul 5245  ax-pow 5304  ax-pr 5371  ax-un 7671  ax-cnex 11065  ax-resscn 11066  ax-1cn 11067  ax-icn 11068  ax-addcl 11069  ax-addrcl 11070  ax-mulcl 11071  ax-mulrcl 11072  ax-mulcom 11073  ax-addass 11074  ax-mulass 11075  ax-distr 11076  ax-i2m1 11077  ax-1ne0 11078  ax-1rid 11079  ax-rnegex 11080  ax-rrecex 11081  ax-cnre 11082  ax-pre-lttri 11083  ax-pre-lttrn 11084  ax-pre-ltadd 11085  ax-pre-mulgt0 11086
This theorem depends on definitions:  df-bi 207  df-an 396  df-or 848  df-3or 1087  df-3an 1088  df-tru 1543  df-fal 1553  df-ex 1780  df-nf 1784  df-sb 2066  df-mo 2533  df-eu 2562  df-clab 2708  df-cleq 2721  df-clel 2803  df-nfc 2878  df-ne 2926  df-nel 3030  df-ral 3045  df-rex 3054  df-rmo 3343  df-reu 3344  df-rab 3395  df-v 3438  df-sbc 3743  df-csb 3852  df-dif 3906  df-un 3908  df-in 3910  df-ss 3920  df-pss 3923  df-nul 4285  df-if 4477  df-pw 4553  df-sn 4578  df-pr 4580  df-op 4584  df-uni 4859  df-int 4897  df-iun 4943  df-br 5093  df-opab 5155  df-mpt 5174  df-tr 5200  df-id 5514  df-eprel 5519  df-po 5527  df-so 5528  df-fr 5572  df-we 5574  df-xp 5625  df-rel 5626  df-cnv 5627  df-co 5628  df-dm 5629  df-rn 5630  df-res 5631  df-ima 5632  df-pred 6249  df-ord 6310  df-on 6311  df-lim 6312  df-suc 6313  df-iota 6438  df-fun 6484  df-fn 6485  df-f 6486  df-f1 6487  df-fo 6488  df-f1o 6489  df-fv 6490  df-riota 7306  df-ov 7352  df-oprab 7353  df-mpo 7354  df-om 7800  df-1st 7924  df-2nd 7925  df-frecs 8214  df-wrecs 8245  df-recs 8294  df-rdg 8332  df-1o 8388  df-2o 8389  df-oadd 8392  df-er 8625  df-en 8873  df-dom 8874  df-sdom 8875  df-fin 8876  df-dju 9797  df-card 9835  df-pnf 11151  df-mnf 11152  df-xr 11153  df-ltxr 11154  df-le 11155  df-sub 11349  df-neg 11350  df-nn 12129  df-2 12191  df-n0 12385  df-xnn0 12458  df-z 12472  df-uz 12736  df-fz 13411  df-hash 14238  df-edg 28997  df-upgr 29031  df-umgr 29032  df-usgr 29100  df-nbgr 29282  df-frgr 30207
This theorem is referenced by:  frgrncvvdeqlem10  30256
  Copyright terms: Public domain W3C validator