Theorem cusgredg 40646

Description: In a complete simple graph, the edges are all the pairs of different vertices. (Contributed by Alexander van der Vekens, 12-Jan-2018.) (Revised by AV, 1-Nov-2020.)

Hypotheses

Ref	Expression
iscusgrvtx.v	⊢ 𝑉 = (Vtx‘𝐺)
iscusgredg.v	⊢ 𝐸 = (Edg‘𝐺)

Assertion

Ref	Expression
cusgredg	⊢ (𝐺 ∈ ComplUSGraph → 𝐸 = {𝑥 ∈ 𝒫 𝑉 ∣ (#‘𝑥) = 2})

Distinct variable groups:   𝑥,𝐺   𝑥,𝑉

Allowed substitution hint:   𝐸(𝑥)

Proof of Theorem cusgredg

Dummy variables 𝑣 𝑛 𝑝 𝑦 𝑧 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		iscusgrvtx.v	. . 3 ⊢ 𝑉 = (Vtx‘𝐺)
2		iscusgredg.v	. . 3 ⊢ 𝐸 = (Edg‘𝐺)
3	1, 2	iscusgredg 40645	. 2 ⊢ (𝐺 ∈ ComplUSGraph ↔ (𝐺 ∈ USGraph ∧ ∀𝑣 ∈ 𝑉 ∀𝑛 ∈ (𝑉 ∖ {𝑣}){𝑛, 𝑣} ∈ 𝐸))
4		usgredgss 40390	. . . . 5 ⊢ (𝐺 ∈ USGraph → (Edg‘𝐺) ⊆ {𝑥 ∈ 𝒫 (Vtx‘𝐺) ∣ (#‘𝑥) = 2})
5	1	pweqi 4112	. . . . . 6 ⊢ 𝒫 𝑉 = 𝒫 (Vtx‘𝐺)
6		rabeq 3166	. . . . . 6 ⊢ (𝒫 𝑉 = 𝒫 (Vtx‘𝐺) → {𝑥 ∈ 𝒫 𝑉 ∣ (#‘𝑥) = 2} = {𝑥 ∈ 𝒫 (Vtx‘𝐺) ∣ (#‘𝑥) = 2})
7	5, 6	ax-mp 5	. . . . 5 ⊢ {𝑥 ∈ 𝒫 𝑉 ∣ (#‘𝑥) = 2} = {𝑥 ∈ 𝒫 (Vtx‘𝐺) ∣ (#‘𝑥) = 2}
8	4, 2, 7	3sstr4g 3609	. . . 4 ⊢ (𝐺 ∈ USGraph → 𝐸 ⊆ {𝑥 ∈ 𝒫 𝑉 ∣ (#‘𝑥) = 2})
9	8	adantr 480	. . 3 ⊢ ((𝐺 ∈ USGraph ∧ ∀𝑣 ∈ 𝑉 ∀𝑛 ∈ (𝑉 ∖ {𝑣}){𝑛, 𝑣} ∈ 𝐸) → 𝐸 ⊆ {𝑥 ∈ 𝒫 𝑉 ∣ (#‘𝑥) = 2})
10		elss2prb 13123	. . . . 5 ⊢ (𝑝 ∈ {𝑥 ∈ 𝒫 𝑉 ∣ (#‘𝑥) = 2} ↔ ∃𝑦 ∈ 𝑉 ∃𝑧 ∈ 𝑉 (𝑦 ≠ 𝑧 ∧ 𝑝 = {𝑦, 𝑧}))
11		sneq 4135	. . . . . . . . . . . . . . 15 ⊢ (𝑣 = 𝑦 → {𝑣} = {𝑦})
12	11	difeq2d 3690	. . . . . . . . . . . . . 14 ⊢ (𝑣 = 𝑦 → (𝑉 ∖ {𝑣}) = (𝑉 ∖ {𝑦}))
13		preq2 4213	. . . . . . . . . . . . . . 15 ⊢ (𝑣 = 𝑦 → {𝑛, 𝑣} = {𝑛, 𝑦})
14	13	eleq1d 2672	. . . . . . . . . . . . . 14 ⊢ (𝑣 = 𝑦 → ({𝑛, 𝑣} ∈ 𝐸 ↔ {𝑛, 𝑦} ∈ 𝐸))
15	12, 14	raleqbidv 3129	. . . . . . . . . . . . 13 ⊢ (𝑣 = 𝑦 → (∀𝑛 ∈ (𝑉 ∖ {𝑣}){𝑛, 𝑣} ∈ 𝐸 ↔ ∀𝑛 ∈ (𝑉 ∖ {𝑦}){𝑛, 𝑦} ∈ 𝐸))
16	15	rspcv 3278	. . . . . . . . . . . 12 ⊢ (𝑦 ∈ 𝑉 → (∀𝑣 ∈ 𝑉 ∀𝑛 ∈ (𝑉 ∖ {𝑣}){𝑛, 𝑣} ∈ 𝐸 → ∀𝑛 ∈ (𝑉 ∖ {𝑦}){𝑛, 𝑦} ∈ 𝐸))
17	16	adantr 480	. . . . . . . . . . 11 ⊢ ((𝑦 ∈ 𝑉 ∧ 𝑧 ∈ 𝑉) → (∀𝑣 ∈ 𝑉 ∀𝑛 ∈ (𝑉 ∖ {𝑣}){𝑛, 𝑣} ∈ 𝐸 → ∀𝑛 ∈ (𝑉 ∖ {𝑦}){𝑛, 𝑦} ∈ 𝐸))
18	17	adantr 480	. . . . . . . . . 10 ⊢ (((𝑦 ∈ 𝑉 ∧ 𝑧 ∈ 𝑉) ∧ (𝑦 ≠ 𝑧 ∧ 𝑝 = {𝑦, 𝑧})) → (∀𝑣 ∈ 𝑉 ∀𝑛 ∈ (𝑉 ∖ {𝑣}){𝑛, 𝑣} ∈ 𝐸 → ∀𝑛 ∈ (𝑉 ∖ {𝑦}){𝑛, 𝑦} ∈ 𝐸))
19		simpr 476	. . . . . . . . . . . . 13 ⊢ ((𝑦 ∈ 𝑉 ∧ 𝑧 ∈ 𝑉) → 𝑧 ∈ 𝑉)
20		necom 2835	. . . . . . . . . . . . . . 15 ⊢ (𝑦 ≠ 𝑧 ↔ 𝑧 ≠ 𝑦)
21	20	biimpi 205	. . . . . . . . . . . . . 14 ⊢ (𝑦 ≠ 𝑧 → 𝑧 ≠ 𝑦)
22	21	adantr 480	. . . . . . . . . . . . 13 ⊢ ((𝑦 ≠ 𝑧 ∧ 𝑝 = {𝑦, 𝑧}) → 𝑧 ≠ 𝑦)
23	19, 22	anim12i 588	. . . . . . . . . . . 12 ⊢ (((𝑦 ∈ 𝑉 ∧ 𝑧 ∈ 𝑉) ∧ (𝑦 ≠ 𝑧 ∧ 𝑝 = {𝑦, 𝑧})) → (𝑧 ∈ 𝑉 ∧ 𝑧 ≠ 𝑦))
24		eldifsn 4260	. . . . . . . . . . . 12 ⊢ (𝑧 ∈ (𝑉 ∖ {𝑦}) ↔ (𝑧 ∈ 𝑉 ∧ 𝑧 ≠ 𝑦))
25	23, 24	sylibr 223	. . . . . . . . . . 11 ⊢ (((𝑦 ∈ 𝑉 ∧ 𝑧 ∈ 𝑉) ∧ (𝑦 ≠ 𝑧 ∧ 𝑝 = {𝑦, 𝑧})) → 𝑧 ∈ (𝑉 ∖ {𝑦}))
26		preq1 4212	. . . . . . . . . . . . 13 ⊢ (𝑛 = 𝑧 → {𝑛, 𝑦} = {𝑧, 𝑦})
27	26	eleq1d 2672	. . . . . . . . . . . 12 ⊢ (𝑛 = 𝑧 → ({𝑛, 𝑦} ∈ 𝐸 ↔ {𝑧, 𝑦} ∈ 𝐸))
28	27	rspcv 3278	. . . . . . . . . . 11 ⊢ (𝑧 ∈ (𝑉 ∖ {𝑦}) → (∀𝑛 ∈ (𝑉 ∖ {𝑦}){𝑛, 𝑦} ∈ 𝐸 → {𝑧, 𝑦} ∈ 𝐸))
29	25, 28	syl 17	. . . . . . . . . 10 ⊢ (((𝑦 ∈ 𝑉 ∧ 𝑧 ∈ 𝑉) ∧ (𝑦 ≠ 𝑧 ∧ 𝑝 = {𝑦, 𝑧})) → (∀𝑛 ∈ (𝑉 ∖ {𝑦}){𝑛, 𝑦} ∈ 𝐸 → {𝑧, 𝑦} ∈ 𝐸))
30		id 22	. . . . . . . . . . . . . . . 16 ⊢ (𝑝 = {𝑦, 𝑧} → 𝑝 = {𝑦, 𝑧})
31		prcom 4211	. . . . . . . . . . . . . . . 16 ⊢ {𝑦, 𝑧} = {𝑧, 𝑦}
32	30, 31	syl6req 2661	. . . . . . . . . . . . . . 15 ⊢ (𝑝 = {𝑦, 𝑧} → {𝑧, 𝑦} = 𝑝)
33	32	eleq1d 2672	. . . . . . . . . . . . . 14 ⊢ (𝑝 = {𝑦, 𝑧} → ({𝑧, 𝑦} ∈ 𝐸 ↔ 𝑝 ∈ 𝐸))
34	33	biimpd 218	. . . . . . . . . . . . 13 ⊢ (𝑝 = {𝑦, 𝑧} → ({𝑧, 𝑦} ∈ 𝐸 → 𝑝 ∈ 𝐸))
35	34	a1d 25	. . . . . . . . . . . 12 ⊢ (𝑝 = {𝑦, 𝑧} → (𝐺 ∈ USGraph → ({𝑧, 𝑦} ∈ 𝐸 → 𝑝 ∈ 𝐸)))
36	35	ad2antll 761	. . . . . . . . . . 11 ⊢ (((𝑦 ∈ 𝑉 ∧ 𝑧 ∈ 𝑉) ∧ (𝑦 ≠ 𝑧 ∧ 𝑝 = {𝑦, 𝑧})) → (𝐺 ∈ USGraph → ({𝑧, 𝑦} ∈ 𝐸 → 𝑝 ∈ 𝐸)))
37	36	com23 84	. . . . . . . . . 10 ⊢ (((𝑦 ∈ 𝑉 ∧ 𝑧 ∈ 𝑉) ∧ (𝑦 ≠ 𝑧 ∧ 𝑝 = {𝑦, 𝑧})) → ({𝑧, 𝑦} ∈ 𝐸 → (𝐺 ∈ USGraph → 𝑝 ∈ 𝐸)))
38	18, 29, 37	3syld 58	. . . . . . . . 9 ⊢ (((𝑦 ∈ 𝑉 ∧ 𝑧 ∈ 𝑉) ∧ (𝑦 ≠ 𝑧 ∧ 𝑝 = {𝑦, 𝑧})) → (∀𝑣 ∈ 𝑉 ∀𝑛 ∈ (𝑉 ∖ {𝑣}){𝑛, 𝑣} ∈ 𝐸 → (𝐺 ∈ USGraph → 𝑝 ∈ 𝐸)))
39	38	ex 449	. . . . . . . 8 ⊢ ((𝑦 ∈ 𝑉 ∧ 𝑧 ∈ 𝑉) → ((𝑦 ≠ 𝑧 ∧ 𝑝 = {𝑦, 𝑧}) → (∀𝑣 ∈ 𝑉 ∀𝑛 ∈ (𝑉 ∖ {𝑣}){𝑛, 𝑣} ∈ 𝐸 → (𝐺 ∈ USGraph → 𝑝 ∈ 𝐸))))
40	39	rexlimivv 3018	. . . . . . 7 ⊢ (∃𝑦 ∈ 𝑉 ∃𝑧 ∈ 𝑉 (𝑦 ≠ 𝑧 ∧ 𝑝 = {𝑦, 𝑧}) → (∀𝑣 ∈ 𝑉 ∀𝑛 ∈ (𝑉 ∖ {𝑣}){𝑛, 𝑣} ∈ 𝐸 → (𝐺 ∈ USGraph → 𝑝 ∈ 𝐸)))
41	40	com13 86	. . . . . 6 ⊢ (𝐺 ∈ USGraph → (∀𝑣 ∈ 𝑉 ∀𝑛 ∈ (𝑉 ∖ {𝑣}){𝑛, 𝑣} ∈ 𝐸 → (∃𝑦 ∈ 𝑉 ∃𝑧 ∈ 𝑉 (𝑦 ≠ 𝑧 ∧ 𝑝 = {𝑦, 𝑧}) → 𝑝 ∈ 𝐸)))
42	41	imp 444	. . . . 5 ⊢ ((𝐺 ∈ USGraph ∧ ∀𝑣 ∈ 𝑉 ∀𝑛 ∈ (𝑉 ∖ {𝑣}){𝑛, 𝑣} ∈ 𝐸) → (∃𝑦 ∈ 𝑉 ∃𝑧 ∈ 𝑉 (𝑦 ≠ 𝑧 ∧ 𝑝 = {𝑦, 𝑧}) → 𝑝 ∈ 𝐸))
43	10, 42	syl5bi 231	. . . 4 ⊢ ((𝐺 ∈ USGraph ∧ ∀𝑣 ∈ 𝑉 ∀𝑛 ∈ (𝑉 ∖ {𝑣}){𝑛, 𝑣} ∈ 𝐸) → (𝑝 ∈ {𝑥 ∈ 𝒫 𝑉 ∣ (#‘𝑥) = 2} → 𝑝 ∈ 𝐸))
44	43	ssrdv 3574	. . 3 ⊢ ((𝐺 ∈ USGraph ∧ ∀𝑣 ∈ 𝑉 ∀𝑛 ∈ (𝑉 ∖ {𝑣}){𝑛, 𝑣} ∈ 𝐸) → {𝑥 ∈ 𝒫 𝑉 ∣ (#‘𝑥) = 2} ⊆ 𝐸)
45	9, 44	eqssd 3585	. 2 ⊢ ((𝐺 ∈ USGraph ∧ ∀𝑣 ∈ 𝑉 ∀𝑛 ∈ (𝑉 ∖ {𝑣}){𝑛, 𝑣} ∈ 𝐸) → 𝐸 = {𝑥 ∈ 𝒫 𝑉 ∣ (#‘𝑥) = 2})
46	3, 45	sylbi 206	1 ⊢ (𝐺 ∈ ComplUSGraph → 𝐸 = {𝑥 ∈ 𝒫 𝑉 ∣ (#‘𝑥) = 2})

Syntax hints:   → wi 4   ∧ wa 383   = wceq 1475   ∈ wcel 1977   ≠ wne 2780  ∀wral 2896  ∃wrex 2897  {crab 2900   ∖ cdif 3537   ⊆ wss 3540  𝒫 cpw 4108  {csn 4125  {cpr 4127  ‘cfv 5804  2c2 10947  #chash 12979  Vtxcvtx 25673  Edgcedga 25792   USGraph cusgr 40379  ComplUSGraphccusgr 40553

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1713  ax-4 1728  ax-5 1827  ax-6 1875  ax-7 1922  ax-8 1979  ax-9 1986  ax-10 2006  ax-11 2021  ax-12 2034  ax-13 2234  ax-ext 2590  ax-rep 4699  ax-sep 4709  ax-nul 4717  ax-pow 4769  ax-pr 4833  ax-un 6847  ax-cnex 9871  ax-resscn 9872  ax-1cn 9873  ax-icn 9874  ax-addcl 9875  ax-addrcl 9876  ax-mulcl 9877  ax-mulrcl 9878  ax-mulcom 9879  ax-addass 9880  ax-mulass 9881  ax-distr 9882  ax-i2m1 9883  ax-1ne0 9884  ax-1rid 9885  ax-rnegex 9886  ax-rrecex 9887  ax-cnre 9888  ax-pre-lttri 9889  ax-pre-lttrn 9890  ax-pre-ltadd 9891  ax-pre-mulgt0 9892

This theorem depends on definitions:  df-bi 196  df-or 384  df-an 385  df-3or 1032  df-3an 1033  df-tru 1478  df-fal 1481  df-ex 1696  df-nf 1701  df-sb 1868  df-eu 2462  df-mo 2463  df-clab 2597  df-cleq 2603  df-clel 2606  df-nfc 2740  df-ne 2782  df-nel 2783  df-ral 2901  df-rex 2902  df-reu 2903  df-rmo 2904  df-rab 2905  df-v 3175  df-sbc 3403  df-csb 3500  df-dif 3543  df-un 3545  df-in 3547  df-ss 3554  df-pss 3556  df-nul 3875  df-if 4037  df-pw 4110  df-sn 4126  df-pr 4128  df-tp 4130  df-op 4132  df-uni 4373  df-int 4411  df-iun 4457  df-br 4584  df-opab 4644  df-mpt 4645  df-tr 4681  df-eprel 4949  df-id 4953  df-po 4959  df-so 4960  df-fr 4997  df-we 4999  df-xp 5044  df-rel 5045  df-cnv 5046  df-co 5047  df-dm 5048  df-rn 5049  df-res 5050  df-ima 5051  df-pred 5597  df-ord 5643  df-on 5644  df-lim 5645  df-suc 5646  df-iota 5768  df-fun 5806  df-fn 5807  df-f 5808  df-f1 5809  df-fo 5810  df-f1o 5811  df-fv 5812  df-riota 6511  df-ov 6552  df-oprab 6553  df-mpt2 6554  df-om 6958  df-1st 7059  df-2nd 7060  df-wrecs 7294  df-recs 7355  df-rdg 7393  df-1o 7447  df-2o 7448  df-oadd 7451  df-er 7629  df-en 7842  df-dom 7843  df-sdom 7844  df-fin 7845  df-card 8648  df-cda 8873  df-pnf 9955  df-mnf 9956  df-xr 9957  df-ltxr 9958  df-le 9959  df-sub 10147  df-neg 10148  df-nn 10898  df-2 10956  df-n0 11170  df-z 11255  df-uz 11564  df-fz 12198  df-hash 12980  df-upgr 25749  df-umgr 25750  df-edga 25793  df-usgr 40381  df-nbgr 40554  df-uvtxa 40556  df-cplgr 40557  df-cusgr 40558

This theorem is referenced by:  cusgrfilem1  40671