Theorem cusgredg 26320

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 26319	. 2 ⊢ (𝐺 ∈ ComplUSGraph ↔ (𝐺 ∈ USGraph ∧ ∀𝑣 ∈ 𝑉 ∀𝑛 ∈ (𝑉 ∖ {𝑣}){𝑛, 𝑣} ∈ 𝐸))
4		usgredgss 26054	. . . . 5 ⊢ (𝐺 ∈ USGraph → (Edg‘𝐺) ⊆ {𝑥 ∈ 𝒫 (Vtx‘𝐺) ∣ (#‘𝑥) = 2})
5	1	pweqi 4162	. . . . . 6 ⊢ 𝒫 𝑉 = 𝒫 (Vtx‘𝐺)
6		rabeq 3192	. . . . . 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 3646	. . . 4 ⊢ (𝐺 ∈ USGraph → 𝐸 ⊆ {𝑥 ∈ 𝒫 𝑉 ∣ (#‘𝑥) = 2})
9	8	adantr 481	. . 3 ⊢ ((𝐺 ∈ USGraph ∧ ∀𝑣 ∈ 𝑉 ∀𝑛 ∈ (𝑉 ∖ {𝑣}){𝑛, 𝑣} ∈ 𝐸) → 𝐸 ⊆ {𝑥 ∈ 𝒫 𝑉 ∣ (#‘𝑥) = 2})
10		elss2prb 13269	. . . . 5 ⊢ (𝑝 ∈ {𝑥 ∈ 𝒫 𝑉 ∣ (#‘𝑥) = 2} ↔ ∃𝑦 ∈ 𝑉 ∃𝑧 ∈ 𝑉 (𝑦 ≠ 𝑧 ∧ 𝑝 = {𝑦, 𝑧}))
11		sneq 4187	. . . . . . . . . . . . . . 15 ⊢ (𝑣 = 𝑦 → {𝑣} = {𝑦})
12	11	difeq2d 3728	. . . . . . . . . . . . . 14 ⊢ (𝑣 = 𝑦 → (𝑉 ∖ {𝑣}) = (𝑉 ∖ {𝑦}))
13		preq2 4269	. . . . . . . . . . . . . . 15 ⊢ (𝑣 = 𝑦 → {𝑛, 𝑣} = {𝑛, 𝑦})
14	13	eleq1d 2686	. . . . . . . . . . . . . 14 ⊢ (𝑣 = 𝑦 → ({𝑛, 𝑣} ∈ 𝐸 ↔ {𝑛, 𝑦} ∈ 𝐸))
15	12, 14	raleqbidv 3152	. . . . . . . . . . . . 13 ⊢ (𝑣 = 𝑦 → (∀𝑛 ∈ (𝑉 ∖ {𝑣}){𝑛, 𝑣} ∈ 𝐸 ↔ ∀𝑛 ∈ (𝑉 ∖ {𝑦}){𝑛, 𝑦} ∈ 𝐸))
16	15	rspcv 3305	. . . . . . . . . . . 12 ⊢ (𝑦 ∈ 𝑉 → (∀𝑣 ∈ 𝑉 ∀𝑛 ∈ (𝑉 ∖ {𝑣}){𝑛, 𝑣} ∈ 𝐸 → ∀𝑛 ∈ (𝑉 ∖ {𝑦}){𝑛, 𝑦} ∈ 𝐸))
17	16	adantr 481	. . . . . . . . . . 11 ⊢ ((𝑦 ∈ 𝑉 ∧ 𝑧 ∈ 𝑉) → (∀𝑣 ∈ 𝑉 ∀𝑛 ∈ (𝑉 ∖ {𝑣}){𝑛, 𝑣} ∈ 𝐸 → ∀𝑛 ∈ (𝑉 ∖ {𝑦}){𝑛, 𝑦} ∈ 𝐸))
18	17	adantr 481	. . . . . . . . . 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 477	. . . . . . . . . . . . 13 ⊢ ((𝑦 ∈ 𝑉 ∧ 𝑧 ∈ 𝑉) → 𝑧 ∈ 𝑉)
20		necom 2847	. . . . . . . . . . . . . . 15 ⊢ (𝑦 ≠ 𝑧 ↔ 𝑧 ≠ 𝑦)
21	20	biimpi 206	. . . . . . . . . . . . . 14 ⊢ (𝑦 ≠ 𝑧 → 𝑧 ≠ 𝑦)
22	21	adantr 481	. . . . . . . . . . . . 13 ⊢ ((𝑦 ≠ 𝑧 ∧ 𝑝 = {𝑦, 𝑧}) → 𝑧 ≠ 𝑦)
23	19, 22	anim12i 590	. . . . . . . . . . . 12 ⊢ (((𝑦 ∈ 𝑉 ∧ 𝑧 ∈ 𝑉) ∧ (𝑦 ≠ 𝑧 ∧ 𝑝 = {𝑦, 𝑧})) → (𝑧 ∈ 𝑉 ∧ 𝑧 ≠ 𝑦))
24		eldifsn 4317	. . . . . . . . . . . 12 ⊢ (𝑧 ∈ (𝑉 ∖ {𝑦}) ↔ (𝑧 ∈ 𝑉 ∧ 𝑧 ≠ 𝑦))
25	23, 24	sylibr 224	. . . . . . . . . . 11 ⊢ (((𝑦 ∈ 𝑉 ∧ 𝑧 ∈ 𝑉) ∧ (𝑦 ≠ 𝑧 ∧ 𝑝 = {𝑦, 𝑧})) → 𝑧 ∈ (𝑉 ∖ {𝑦}))
26		preq1 4268	. . . . . . . . . . . . 13 ⊢ (𝑛 = 𝑧 → {𝑛, 𝑦} = {𝑧, 𝑦})
27	26	eleq1d 2686	. . . . . . . . . . . 12 ⊢ (𝑛 = 𝑧 → ({𝑛, 𝑦} ∈ 𝐸 ↔ {𝑧, 𝑦} ∈ 𝐸))
28	27	rspcv 3305	. . . . . . . . . . 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 4267	. . . . . . . . . . . . . . . 16 ⊢ {𝑦, 𝑧} = {𝑧, 𝑦}
32	30, 31	syl6req 2673	. . . . . . . . . . . . . . 15 ⊢ (𝑝 = {𝑦, 𝑧} → {𝑧, 𝑦} = 𝑝)
33	32	eleq1d 2686	. . . . . . . . . . . . . 14 ⊢ (𝑝 = {𝑦, 𝑧} → ({𝑧, 𝑦} ∈ 𝐸 ↔ 𝑝 ∈ 𝐸))
34	33	biimpd 219	. . . . . . . . . . . . 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 765	. . . . . . . . . . 11 ⊢ (((𝑦 ∈ 𝑉 ∧ 𝑧 ∈ 𝑉) ∧ (𝑦 ≠ 𝑧 ∧ 𝑝 = {𝑦, 𝑧})) → (𝐺 ∈ USGraph → ({𝑧, 𝑦} ∈ 𝐸 → 𝑝 ∈ 𝐸)))
37	36	com23 86	. . . . . . . . . 10 ⊢ (((𝑦 ∈ 𝑉 ∧ 𝑧 ∈ 𝑉) ∧ (𝑦 ≠ 𝑧 ∧ 𝑝 = {𝑦, 𝑧})) → ({𝑧, 𝑦} ∈ 𝐸 → (𝐺 ∈ USGraph → 𝑝 ∈ 𝐸)))
38	18, 29, 37	3syld 60	. . . . . . . . 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 450	. . . . . . . 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 3036	. . . . . . 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 88	. . . . . 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 445	. . . . 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 232	. . . 4 ⊢ ((𝐺 ∈ USGraph ∧ ∀𝑣 ∈ 𝑉 ∀𝑛 ∈ (𝑉 ∖ {𝑣}){𝑛, 𝑣} ∈ 𝐸) → (𝑝 ∈ {𝑥 ∈ 𝒫 𝑉 ∣ (#‘𝑥) = 2} → 𝑝 ∈ 𝐸))
44	43	ssrdv 3609	. . 3 ⊢ ((𝐺 ∈ USGraph ∧ ∀𝑣 ∈ 𝑉 ∀𝑛 ∈ (𝑉 ∖ {𝑣}){𝑛, 𝑣} ∈ 𝐸) → {𝑥 ∈ 𝒫 𝑉 ∣ (#‘𝑥) = 2} ⊆ 𝐸)
45	9, 44	eqssd 3620	. 2 ⊢ ((𝐺 ∈ USGraph ∧ ∀𝑣 ∈ 𝑉 ∀𝑛 ∈ (𝑉 ∖ {𝑣}){𝑛, 𝑣} ∈ 𝐸) → 𝐸 = {𝑥 ∈ 𝒫 𝑉 ∣ (#‘𝑥) = 2})
46	3, 45	sylbi 207	1 ⊢ (𝐺 ∈ ComplUSGraph → 𝐸 = {𝑥 ∈ 𝒫 𝑉 ∣ (#‘𝑥) = 2})

Syntax hints:   → wi 4   ∧ wa 384   = wceq 1483   ∈ wcel 1990   ≠ wne 2794  ∀wral 2912  ∃wrex 2913  {crab 2916   ∖ cdif 3571   ⊆ wss 3574  𝒫 cpw 4158  {csn 4177  {cpr 4179  ‘cfv 5888  2c2 11070  #chash 13117  Vtxcvtx 25874  Edgcedg 25939   USGraph cusgr 26044  ComplUSGraphccusgr 26227

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1722  ax-4 1737  ax-5 1839  ax-6 1888  ax-7 1935  ax-8 1992  ax-9 1999  ax-10 2019  ax-11 2034  ax-12 2047  ax-13 2246  ax-ext 2602  ax-rep 4771  ax-sep 4781  ax-nul 4789  ax-pow 4843  ax-pr 4906  ax-un 6949  ax-cnex 9992  ax-resscn 9993  ax-1cn 9994  ax-icn 9995  ax-addcl 9996  ax-addrcl 9997  ax-mulcl 9998  ax-mulrcl 9999  ax-mulcom 10000  ax-addass 10001  ax-mulass 10002  ax-distr 10003  ax-i2m1 10004  ax-1ne0 10005  ax-1rid 10006  ax-rnegex 10007  ax-rrecex 10008  ax-cnre 10009  ax-pre-lttri 10010  ax-pre-lttrn 10011  ax-pre-ltadd 10012  ax-pre-mulgt0 10013

This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  df-3or 1038  df-3an 1039  df-tru 1486  df-fal 1489  df-ex 1705  df-nf 1710  df-sb 1881  df-eu 2474  df-mo 2475  df-clab 2609  df-cleq 2615  df-clel 2618  df-nfc 2753  df-ne 2795  df-nel 2898  df-ral 2917  df-rex 2918  df-reu 2919  df-rmo 2920  df-rab 2921  df-v 3202  df-sbc 3436  df-csb 3534  df-dif 3577  df-un 3579  df-in 3581  df-ss 3588  df-pss 3590  df-nul 3916  df-if 4087  df-pw 4160  df-sn 4178  df-pr 4180  df-tp 4182  df-op 4184  df-uni 4437  df-int 4476  df-iun 4522  df-br 4654  df-opab 4713  df-mpt 4730  df-tr 4753  df-id 5024  df-eprel 5029  df-po 5035  df-so 5036  df-fr 5073  df-we 5075  df-xp 5120  df-rel 5121  df-cnv 5122  df-co 5123  df-dm 5124  df-rn 5125  df-res 5126  df-ima 5127  df-pred 5680  df-ord 5726  df-on 5727  df-lim 5728  df-suc 5729  df-iota 5851  df-fun 5890  df-fn 5891  df-f 5892  df-f1 5893  df-fo 5894  df-f1o 5895  df-fv 5896  df-riota 6611  df-ov 6653  df-oprab 6654  df-mpt2 6655  df-om 7066  df-1st 7168  df-2nd 7169  df-wrecs 7407  df-recs 7468  df-rdg 7506  df-1o 7560  df-2o 7561  df-oadd 7564  df-er 7742  df-en 7956  df-dom 7957  df-sdom 7958  df-fin 7959  df-card 8765  df-cda 8990  df-pnf 10076  df-mnf 10077  df-xr 10078  df-ltxr 10079  df-le 10080  df-sub 10268  df-neg 10269  df-nn 11021  df-2 11079  df-n0 11293  df-xnn0 11364  df-z 11378  df-uz 11688  df-fz 12327  df-hash 13118  df-edg 25940  df-upgr 25977  df-umgr 25978  df-usgr 26046  df-nbgr 26228  df-uvtxa 26230  df-cplgr 26231  df-cusgr 26232

This theorem is referenced by:  cusgrfilem1  26351