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Theorem incistruhgr 15911
Description: An incidence structure 𝑃, 𝐿, 𝐼 "where 𝑃 is a set whose elements are called points, 𝐿 is a distinct set whose elements are called lines and 𝐼 ⊆ (𝑃 × 𝐿) is the incidence relation" (see Wikipedia "Incidence structure" (24-Oct-2020), https://en.wikipedia.org/wiki/Incidence_structure) implies an undirected hypergraph, if the incidence relation is right-total (to exclude empty edges). The points become the vertices, and the edge function is derived from the incidence relation by mapping each line ("edge") to the set of vertices incident to the line/edge. With 𝑃 = (Base‘𝑆) and by defining two new slots for lines and incidence relations and enhancing the definition of iEdg accordingly, it would even be possible to express that a corresponding incidence structure is an undirected hypergraph. By choosing the incident relation appropriately, other kinds of undirected graphs (pseudographs, multigraphs, simple graphs, etc.) could be defined. (Contributed by AV, 24-Oct-2020.)
Hypotheses
Ref Expression
incistruhgr.v 𝑉 = (Vtx‘𝐺)
incistruhgr.e 𝐸 = (iEdg‘𝐺)
Assertion
Ref Expression
incistruhgr ((𝐺𝑊𝐼 ⊆ (𝑃 × 𝐿) ∧ ran 𝐼 = 𝐿) → ((𝑉 = 𝑃𝐸 = (𝑒𝐿 ↦ {𝑣𝑃𝑣𝐼𝑒})) → 𝐺 ∈ UHGraph))
Distinct variable groups:   𝑒,𝐸   𝑒,𝐺   𝑒,𝐼,𝑣   𝑒,𝐿,𝑣   𝑃,𝑒,𝑣   𝑒,𝑉,𝑣   𝑒,𝑊
Allowed substitution hints:   𝐸(𝑣)   𝐺(𝑣)   𝑊(𝑣)

Proof of Theorem incistruhgr
Dummy variables 𝑗 𝑠 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 rabeq 2791 . . . . . . . . 9 (𝑉 = 𝑃 → {𝑣𝑉𝑣𝐼𝑒} = {𝑣𝑃𝑣𝐼𝑒})
21mpteq2dv 4175 . . . . . . . 8 (𝑉 = 𝑃 → (𝑒𝐿 ↦ {𝑣𝑉𝑣𝐼𝑒}) = (𝑒𝐿 ↦ {𝑣𝑃𝑣𝐼𝑒}))
32eqeq2d 2241 . . . . . . 7 (𝑉 = 𝑃 → (𝐸 = (𝑒𝐿 ↦ {𝑣𝑉𝑣𝐼𝑒}) ↔ 𝐸 = (𝑒𝐿 ↦ {𝑣𝑃𝑣𝐼𝑒})))
4 xpeq1 4734 . . . . . . . . 9 (𝑉 = 𝑃 → (𝑉 × 𝐿) = (𝑃 × 𝐿))
54sseq2d 3254 . . . . . . . 8 (𝑉 = 𝑃 → (𝐼 ⊆ (𝑉 × 𝐿) ↔ 𝐼 ⊆ (𝑃 × 𝐿)))
653anbi2d 1351 . . . . . . 7 (𝑉 = 𝑃 → ((𝐺𝑊𝐼 ⊆ (𝑉 × 𝐿) ∧ ran 𝐼 = 𝐿) ↔ (𝐺𝑊𝐼 ⊆ (𝑃 × 𝐿) ∧ ran 𝐼 = 𝐿)))
73, 6anbi12d 473 . . . . . 6 (𝑉 = 𝑃 → ((𝐸 = (𝑒𝐿 ↦ {𝑣𝑉𝑣𝐼𝑒}) ∧ (𝐺𝑊𝐼 ⊆ (𝑉 × 𝐿) ∧ ran 𝐼 = 𝐿)) ↔ (𝐸 = (𝑒𝐿 ↦ {𝑣𝑃𝑣𝐼𝑒}) ∧ (𝐺𝑊𝐼 ⊆ (𝑃 × 𝐿) ∧ ran 𝐼 = 𝐿))))
8 simpl 109 . . . . . . . 8 ((𝐸 = (𝑒𝐿 ↦ {𝑣𝑉𝑣𝐼𝑒}) ∧ (𝐺𝑊𝐼 ⊆ (𝑉 × 𝐿) ∧ ran 𝐼 = 𝐿)) → 𝐸 = (𝑒𝐿 ↦ {𝑣𝑉𝑣𝐼𝑒}))
9 dmeq 4926 . . . . . . . . 9 (𝐸 = (𝑒𝐿 ↦ {𝑣𝑉𝑣𝐼𝑒}) → dom 𝐸 = dom (𝑒𝐿 ↦ {𝑣𝑉𝑣𝐼𝑒}))
10 eqid 2229 . . . . . . . . . 10 (𝑒𝐿 ↦ {𝑣𝑉𝑣𝐼𝑒}) = (𝑒𝐿 ↦ {𝑣𝑉𝑣𝐼𝑒})
11 eqid 2229 . . . . . . . . . . 11 {𝑣𝑉𝑣𝐼𝑒} = {𝑣𝑉𝑣𝐼𝑒}
12 incistruhgr.v . . . . . . . . . . . 12 𝑉 = (Vtx‘𝐺)
13 simpl1 1024 . . . . . . . . . . . . 13 (((𝐺𝑊𝐼 ⊆ (𝑉 × 𝐿) ∧ ran 𝐼 = 𝐿) ∧ 𝑒𝐿) → 𝐺𝑊)
14 vtxex 15840 . . . . . . . . . . . . 13 (𝐺𝑊 → (Vtx‘𝐺) ∈ V)
1513, 14syl 14 . . . . . . . . . . . 12 (((𝐺𝑊𝐼 ⊆ (𝑉 × 𝐿) ∧ ran 𝐼 = 𝐿) ∧ 𝑒𝐿) → (Vtx‘𝐺) ∈ V)
1612, 15eqeltrid 2316 . . . . . . . . . . 11 (((𝐺𝑊𝐼 ⊆ (𝑉 × 𝐿) ∧ ran 𝐼 = 𝐿) ∧ 𝑒𝐿) → 𝑉 ∈ V)
1711, 16rabexd 4230 . . . . . . . . . 10 (((𝐺𝑊𝐼 ⊆ (𝑉 × 𝐿) ∧ ran 𝐼 = 𝐿) ∧ 𝑒𝐿) → {𝑣𝑉𝑣𝐼𝑒} ∈ V)
1810, 17dmmptd 5457 . . . . . . . . 9 ((𝐺𝑊𝐼 ⊆ (𝑉 × 𝐿) ∧ ran 𝐼 = 𝐿) → dom (𝑒𝐿 ↦ {𝑣𝑉𝑣𝐼𝑒}) = 𝐿)
199, 18sylan9eq 2282 . . . . . . . 8 ((𝐸 = (𝑒𝐿 ↦ {𝑣𝑉𝑣𝐼𝑒}) ∧ (𝐺𝑊𝐼 ⊆ (𝑉 × 𝐿) ∧ ran 𝐼 = 𝐿)) → dom 𝐸 = 𝐿)
208, 19jca 306 . . . . . . 7 ((𝐸 = (𝑒𝐿 ↦ {𝑣𝑉𝑣𝐼𝑒}) ∧ (𝐺𝑊𝐼 ⊆ (𝑉 × 𝐿) ∧ ran 𝐼 = 𝐿)) → (𝐸 = (𝑒𝐿 ↦ {𝑣𝑉𝑣𝐼𝑒}) ∧ dom 𝐸 = 𝐿))
21 simpr 110 . . . . . . 7 ((𝐸 = (𝑒𝐿 ↦ {𝑣𝑉𝑣𝐼𝑒}) ∧ (𝐺𝑊𝐼 ⊆ (𝑉 × 𝐿) ∧ ran 𝐼 = 𝐿)) → (𝐺𝑊𝐼 ⊆ (𝑉 × 𝐿) ∧ ran 𝐼 = 𝐿))
22 eleq2 2293 . . . . . . . . . . 11 (𝑠 = {𝑣𝑉𝑣𝐼𝑒} → (𝑗𝑠𝑗 ∈ {𝑣𝑉𝑣𝐼𝑒}))
2322exbidv 1871 . . . . . . . . . 10 (𝑠 = {𝑣𝑉𝑣𝐼𝑒} → (∃𝑗 𝑗𝑠 ↔ ∃𝑗 𝑗 ∈ {𝑣𝑉𝑣𝐼𝑒}))
24 ssrab2 3309 . . . . . . . . . . 11 {𝑣𝑉𝑣𝐼𝑒} ⊆ 𝑉
25 elpwg 3657 . . . . . . . . . . . 12 ({𝑣𝑉𝑣𝐼𝑒} ∈ V → ({𝑣𝑉𝑣𝐼𝑒} ∈ 𝒫 𝑉 ↔ {𝑣𝑉𝑣𝐼𝑒} ⊆ 𝑉))
2617, 25syl 14 . . . . . . . . . . 11 (((𝐺𝑊𝐼 ⊆ (𝑉 × 𝐿) ∧ ran 𝐼 = 𝐿) ∧ 𝑒𝐿) → ({𝑣𝑉𝑣𝐼𝑒} ∈ 𝒫 𝑉 ↔ {𝑣𝑉𝑣𝐼𝑒} ⊆ 𝑉))
2724, 26mpbiri 168 . . . . . . . . . 10 (((𝐺𝑊𝐼 ⊆ (𝑉 × 𝐿) ∧ ran 𝐼 = 𝐿) ∧ 𝑒𝐿) → {𝑣𝑉𝑣𝐼𝑒} ∈ 𝒫 𝑉)
28 eleq2 2293 . . . . . . . . . . . . . 14 (ran 𝐼 = 𝐿 → (𝑒 ∈ ran 𝐼𝑒𝐿))
29283ad2ant3 1044 . . . . . . . . . . . . 13 ((𝐺𝑊𝐼 ⊆ (𝑉 × 𝐿) ∧ ran 𝐼 = 𝐿) → (𝑒 ∈ ran 𝐼𝑒𝐿))
30 ssrelrn 4917 . . . . . . . . . . . . . . 15 ((𝐼 ⊆ (𝑉 × 𝐿) ∧ 𝑒 ∈ ran 𝐼) → ∃𝑣𝑉 𝑣𝐼𝑒)
3130ex 115 . . . . . . . . . . . . . 14 (𝐼 ⊆ (𝑉 × 𝐿) → (𝑒 ∈ ran 𝐼 → ∃𝑣𝑉 𝑣𝐼𝑒))
32313ad2ant2 1043 . . . . . . . . . . . . 13 ((𝐺𝑊𝐼 ⊆ (𝑉 × 𝐿) ∧ ran 𝐼 = 𝐿) → (𝑒 ∈ ran 𝐼 → ∃𝑣𝑉 𝑣𝐼𝑒))
3329, 32sylbird 170 . . . . . . . . . . . 12 ((𝐺𝑊𝐼 ⊆ (𝑉 × 𝐿) ∧ ran 𝐼 = 𝐿) → (𝑒𝐿 → ∃𝑣𝑉 𝑣𝐼𝑒))
3433imp 124 . . . . . . . . . . 11 (((𝐺𝑊𝐼 ⊆ (𝑉 × 𝐿) ∧ ran 𝐼 = 𝐿) ∧ 𝑒𝐿) → ∃𝑣𝑉 𝑣𝐼𝑒)
35 rabn0m 3519 . . . . . . . . . . 11 (∃𝑗 𝑗 ∈ {𝑣𝑉𝑣𝐼𝑒} ↔ ∃𝑣𝑉 𝑣𝐼𝑒)
3634, 35sylibr 134 . . . . . . . . . 10 (((𝐺𝑊𝐼 ⊆ (𝑉 × 𝐿) ∧ ran 𝐼 = 𝐿) ∧ 𝑒𝐿) → ∃𝑗 𝑗 ∈ {𝑣𝑉𝑣𝐼𝑒})
3723, 27, 36elrabd 2961 . . . . . . . . 9 (((𝐺𝑊𝐼 ⊆ (𝑉 × 𝐿) ∧ ran 𝐼 = 𝐿) ∧ 𝑒𝐿) → {𝑣𝑉𝑣𝐼𝑒} ∈ {𝑠 ∈ 𝒫 𝑉 ∣ ∃𝑗 𝑗𝑠})
3837fmpttd 5795 . . . . . . . 8 ((𝐺𝑊𝐼 ⊆ (𝑉 × 𝐿) ∧ ran 𝐼 = 𝐿) → (𝑒𝐿 ↦ {𝑣𝑉𝑣𝐼𝑒}):𝐿⟶{𝑠 ∈ 𝒫 𝑉 ∣ ∃𝑗 𝑗𝑠})
39 simpl 109 . . . . . . . . 9 ((𝐸 = (𝑒𝐿 ↦ {𝑣𝑉𝑣𝐼𝑒}) ∧ dom 𝐸 = 𝐿) → 𝐸 = (𝑒𝐿 ↦ {𝑣𝑉𝑣𝐼𝑒}))
40 simpr 110 . . . . . . . . 9 ((𝐸 = (𝑒𝐿 ↦ {𝑣𝑉𝑣𝐼𝑒}) ∧ dom 𝐸 = 𝐿) → dom 𝐸 = 𝐿)
4139, 40feq12d 5466 . . . . . . . 8 ((𝐸 = (𝑒𝐿 ↦ {𝑣𝑉𝑣𝐼𝑒}) ∧ dom 𝐸 = 𝐿) → (𝐸:dom 𝐸⟶{𝑠 ∈ 𝒫 𝑉 ∣ ∃𝑗 𝑗𝑠} ↔ (𝑒𝐿 ↦ {𝑣𝑉𝑣𝐼𝑒}):𝐿⟶{𝑠 ∈ 𝒫 𝑉 ∣ ∃𝑗 𝑗𝑠}))
4238, 41imbitrrid 156 . . . . . . 7 ((𝐸 = (𝑒𝐿 ↦ {𝑣𝑉𝑣𝐼𝑒}) ∧ dom 𝐸 = 𝐿) → ((𝐺𝑊𝐼 ⊆ (𝑉 × 𝐿) ∧ ran 𝐼 = 𝐿) → 𝐸:dom 𝐸⟶{𝑠 ∈ 𝒫 𝑉 ∣ ∃𝑗 𝑗𝑠}))
4320, 21, 42sylc 62 . . . . . 6 ((𝐸 = (𝑒𝐿 ↦ {𝑣𝑉𝑣𝐼𝑒}) ∧ (𝐺𝑊𝐼 ⊆ (𝑉 × 𝐿) ∧ ran 𝐼 = 𝐿)) → 𝐸:dom 𝐸⟶{𝑠 ∈ 𝒫 𝑉 ∣ ∃𝑗 𝑗𝑠})
447, 43biimtrrdi 164 . . . . 5 (𝑉 = 𝑃 → ((𝐸 = (𝑒𝐿 ↦ {𝑣𝑃𝑣𝐼𝑒}) ∧ (𝐺𝑊𝐼 ⊆ (𝑃 × 𝐿) ∧ ran 𝐼 = 𝐿)) → 𝐸:dom 𝐸⟶{𝑠 ∈ 𝒫 𝑉 ∣ ∃𝑗 𝑗𝑠}))
4544expdimp 259 . . . 4 ((𝑉 = 𝑃𝐸 = (𝑒𝐿 ↦ {𝑣𝑃𝑣𝐼𝑒})) → ((𝐺𝑊𝐼 ⊆ (𝑃 × 𝐿) ∧ ran 𝐼 = 𝐿) → 𝐸:dom 𝐸⟶{𝑠 ∈ 𝒫 𝑉 ∣ ∃𝑗 𝑗𝑠}))
4645impcom 125 . . 3 (((𝐺𝑊𝐼 ⊆ (𝑃 × 𝐿) ∧ ran 𝐼 = 𝐿) ∧ (𝑉 = 𝑃𝐸 = (𝑒𝐿 ↦ {𝑣𝑃𝑣𝐼𝑒}))) → 𝐸:dom 𝐸⟶{𝑠 ∈ 𝒫 𝑉 ∣ ∃𝑗 𝑗𝑠})
47 incistruhgr.e . . . . . 6 𝐸 = (iEdg‘𝐺)
4812, 47isuhgrm 15892 . . . . 5 (𝐺𝑊 → (𝐺 ∈ UHGraph ↔ 𝐸:dom 𝐸⟶{𝑠 ∈ 𝒫 𝑉 ∣ ∃𝑗 𝑗𝑠}))
49483ad2ant1 1042 . . . 4 ((𝐺𝑊𝐼 ⊆ (𝑃 × 𝐿) ∧ ran 𝐼 = 𝐿) → (𝐺 ∈ UHGraph ↔ 𝐸:dom 𝐸⟶{𝑠 ∈ 𝒫 𝑉 ∣ ∃𝑗 𝑗𝑠}))
5049adantr 276 . . 3 (((𝐺𝑊𝐼 ⊆ (𝑃 × 𝐿) ∧ ran 𝐼 = 𝐿) ∧ (𝑉 = 𝑃𝐸 = (𝑒𝐿 ↦ {𝑣𝑃𝑣𝐼𝑒}))) → (𝐺 ∈ UHGraph ↔ 𝐸:dom 𝐸⟶{𝑠 ∈ 𝒫 𝑉 ∣ ∃𝑗 𝑗𝑠}))
5146, 50mpbird 167 . 2 (((𝐺𝑊𝐼 ⊆ (𝑃 × 𝐿) ∧ ran 𝐼 = 𝐿) ∧ (𝑉 = 𝑃𝐸 = (𝑒𝐿 ↦ {𝑣𝑃𝑣𝐼𝑒}))) → 𝐺 ∈ UHGraph)
5251ex 115 1 ((𝐺𝑊𝐼 ⊆ (𝑃 × 𝐿) ∧ ran 𝐼 = 𝐿) → ((𝑉 = 𝑃𝐸 = (𝑒𝐿 ↦ {𝑣𝑃𝑣𝐼𝑒})) → 𝐺 ∈ UHGraph))
Colors of variables: wff set class
Syntax hints:  wi 4  wa 104  wb 105  w3a 1002   = wceq 1395  wex 1538  wcel 2200  wrex 2509  {crab 2512  Vcvv 2799  wss 3197  𝒫 cpw 3649   class class class wbr 4083  cmpt 4145   × cxp 4718  dom cdm 4720  ran crn 4721  wf 5317  cfv 5321  Vtxcvtx 15834  iEdgciedg 15835  UHGraphcuhgr 15888
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-sep 4202  ax-pow 4259  ax-pr 4294  ax-un 4525  ax-setind 4630  ax-cnex 8106  ax-resscn 8107  ax-1cn 8108  ax-1re 8109  ax-icn 8110  ax-addcl 8111  ax-addrcl 8112  ax-mulcl 8113  ax-addcom 8115  ax-mulcom 8116  ax-addass 8117  ax-mulass 8118  ax-distr 8119  ax-i2m1 8120  ax-1rid 8122  ax-0id 8123  ax-rnegex 8124  ax-cnre 8126
This theorem depends on definitions:  df-bi 117  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-ral 2513  df-rex 2514  df-reu 2515  df-rab 2517  df-v 2801  df-sbc 3029  df-csb 3125  df-dif 3199  df-un 3201  df-in 3203  df-ss 3210  df-if 3603  df-pw 3651  df-sn 3672  df-pr 3673  df-op 3675  df-uni 3889  df-int 3924  df-br 4084  df-opab 4146  df-mpt 4147  df-id 4385  df-xp 4726  df-rel 4727  df-cnv 4728  df-co 4729  df-dm 4730  df-rn 4731  df-res 4732  df-ima 4733  df-iota 5281  df-fun 5323  df-fn 5324  df-f 5325  df-fo 5327  df-fv 5329  df-riota 5963  df-ov 6013  df-oprab 6014  df-mpo 6015  df-1st 6295  df-2nd 6296  df-sub 8335  df-inn 9127  df-2 9185  df-3 9186  df-4 9187  df-5 9188  df-6 9189  df-7 9190  df-8 9191  df-9 9192  df-n0 9386  df-dec 9595  df-ndx 13056  df-slot 13057  df-base 13059  df-edgf 15827  df-vtx 15836  df-iedg 15837  df-uhgrm 15890
This theorem is referenced by: (None)
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