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| Mirrors > Home > MPE Home > Th. List > usgrexi | Structured version Visualization version GIF version | ||
| Description: An arbitrary set regarded as vertices together with the set of pairs of elements of this set regarded as edges is a simple graph. (Contributed by Alexander van der Vekens, 12-Jan-2018.) (Revised by AV, 5-Nov-2020.) (Proof shortened by AV, 10-Nov-2021.) |
| Ref | Expression |
|---|---|
| usgrexi.p | ⊢ 𝑃 = {𝑥 ∈ 𝒫 𝑉 ∣ (♯‘𝑥) = 2} |
| Ref | Expression |
|---|---|
| usgrexi | ⊢ (𝑉 ∈ 𝑊 → 〈𝑉, ( I ↾ 𝑃)〉 ∈ USGraph) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | usgrexi.p | . . . 4 ⊢ 𝑃 = {𝑥 ∈ 𝒫 𝑉 ∣ (♯‘𝑥) = 2} | |
| 2 | 1 | usgrexilem 29385 | . . 3 ⊢ (𝑉 ∈ 𝑊 → ( I ↾ 𝑃):dom ( I ↾ 𝑃)–1-1→{𝑥 ∈ 𝒫 𝑉 ∣ (♯‘𝑥) = 2}) |
| 3 | 1 | cusgrexilem1 29384 | . . . . 5 ⊢ (𝑉 ∈ 𝑊 → ( I ↾ 𝑃) ∈ V) |
| 4 | opiedgfv 28952 | . . . . 5 ⊢ ((𝑉 ∈ 𝑊 ∧ ( I ↾ 𝑃) ∈ V) → (iEdg‘〈𝑉, ( I ↾ 𝑃)〉) = ( I ↾ 𝑃)) | |
| 5 | 3, 4 | mpdan 687 | . . . 4 ⊢ (𝑉 ∈ 𝑊 → (iEdg‘〈𝑉, ( I ↾ 𝑃)〉) = ( I ↾ 𝑃)) |
| 6 | 5 | dmeqd 5848 | . . . 4 ⊢ (𝑉 ∈ 𝑊 → dom (iEdg‘〈𝑉, ( I ↾ 𝑃)〉) = dom ( I ↾ 𝑃)) |
| 7 | opvtxfv 28949 | . . . . . . 7 ⊢ ((𝑉 ∈ 𝑊 ∧ ( I ↾ 𝑃) ∈ V) → (Vtx‘〈𝑉, ( I ↾ 𝑃)〉) = 𝑉) | |
| 8 | 3, 7 | mpdan 687 | . . . . . 6 ⊢ (𝑉 ∈ 𝑊 → (Vtx‘〈𝑉, ( I ↾ 𝑃)〉) = 𝑉) |
| 9 | 8 | pweqd 4568 | . . . . 5 ⊢ (𝑉 ∈ 𝑊 → 𝒫 (Vtx‘〈𝑉, ( I ↾ 𝑃)〉) = 𝒫 𝑉) |
| 10 | 9 | rabeqdv 3410 | . . . 4 ⊢ (𝑉 ∈ 𝑊 → {𝑥 ∈ 𝒫 (Vtx‘〈𝑉, ( I ↾ 𝑃)〉) ∣ (♯‘𝑥) = 2} = {𝑥 ∈ 𝒫 𝑉 ∣ (♯‘𝑥) = 2}) |
| 11 | 5, 6, 10 | f1eq123d 6756 | . . 3 ⊢ (𝑉 ∈ 𝑊 → ((iEdg‘〈𝑉, ( I ↾ 𝑃)〉):dom (iEdg‘〈𝑉, ( I ↾ 𝑃)〉)–1-1→{𝑥 ∈ 𝒫 (Vtx‘〈𝑉, ( I ↾ 𝑃)〉) ∣ (♯‘𝑥) = 2} ↔ ( I ↾ 𝑃):dom ( I ↾ 𝑃)–1-1→{𝑥 ∈ 𝒫 𝑉 ∣ (♯‘𝑥) = 2})) |
| 12 | 2, 11 | mpbird 257 | . 2 ⊢ (𝑉 ∈ 𝑊 → (iEdg‘〈𝑉, ( I ↾ 𝑃)〉):dom (iEdg‘〈𝑉, ( I ↾ 𝑃)〉)–1-1→{𝑥 ∈ 𝒫 (Vtx‘〈𝑉, ( I ↾ 𝑃)〉) ∣ (♯‘𝑥) = 2}) |
| 13 | opex 5407 | . . 3 ⊢ 〈𝑉, ( I ↾ 𝑃)〉 ∈ V | |
| 14 | eqid 2729 | . . . 4 ⊢ (Vtx‘〈𝑉, ( I ↾ 𝑃)〉) = (Vtx‘〈𝑉, ( I ↾ 𝑃)〉) | |
| 15 | eqid 2729 | . . . 4 ⊢ (iEdg‘〈𝑉, ( I ↾ 𝑃)〉) = (iEdg‘〈𝑉, ( I ↾ 𝑃)〉) | |
| 16 | 14, 15 | isusgrs 29101 | . . 3 ⊢ (〈𝑉, ( I ↾ 𝑃)〉 ∈ V → (〈𝑉, ( I ↾ 𝑃)〉 ∈ USGraph ↔ (iEdg‘〈𝑉, ( I ↾ 𝑃)〉):dom (iEdg‘〈𝑉, ( I ↾ 𝑃)〉)–1-1→{𝑥 ∈ 𝒫 (Vtx‘〈𝑉, ( I ↾ 𝑃)〉) ∣ (♯‘𝑥) = 2})) |
| 17 | 13, 16 | mp1i 13 | . 2 ⊢ (𝑉 ∈ 𝑊 → (〈𝑉, ( I ↾ 𝑃)〉 ∈ USGraph ↔ (iEdg‘〈𝑉, ( I ↾ 𝑃)〉):dom (iEdg‘〈𝑉, ( I ↾ 𝑃)〉)–1-1→{𝑥 ∈ 𝒫 (Vtx‘〈𝑉, ( I ↾ 𝑃)〉) ∣ (♯‘𝑥) = 2})) |
| 18 | 12, 17 | mpbird 257 | 1 ⊢ (𝑉 ∈ 𝑊 → 〈𝑉, ( I ↾ 𝑃)〉 ∈ USGraph) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ↔ wb 206 = wceq 1540 ∈ wcel 2109 {crab 3394 Vcvv 3436 𝒫 cpw 4551 〈cop 4583 I cid 5513 dom cdm 5619 ↾ cres 5621 –1-1→wf1 6479 ‘cfv 6482 2c2 12183 ♯chash 14237 Vtxcvtx 28941 iEdgciedg 28942 USGraphcusgr 29094 |
| 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-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-er 8625 df-en 8873 df-dom 8874 df-sdom 8875 df-fin 8876 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-z 12472 df-uz 12736 df-fz 13411 df-hash 14238 df-vtx 28943 df-iedg 28944 df-usgr 29096 |
| This theorem is referenced by: cusgrexi 29388 |
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