Theorem cusgredgex 35106

Description: Any two (distinct) vertices in a complete simple graph are connected to each other by an edge. (Contributed by BTernaryTau, 3-Oct-2023.)

Hypotheses

Ref	Expression
cusgredgex.1	⊢ 𝑉 = (Vtx‘𝐺)
cusgredgex.2	⊢ 𝐸 = (Edg‘𝐺)

Assertion

Ref	Expression
cusgredgex	⊢ (𝐺 ∈ ComplUSGraph → ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ (𝑉 ∖ {𝐴})) → {𝐴, 𝐵} ∈ 𝐸))

Proof of Theorem cusgredgex

Dummy variable 𝑒 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		cusgrcplgr 29452	. . . . . . . 8 ⊢ (𝐺 ∈ ComplUSGraph → 𝐺 ∈ ComplGraph)
2		cusgredgex.1	. . . . . . . . 9 ⊢ 𝑉 = (Vtx‘𝐺)
3		cusgredgex.2	. . . . . . . . 9 ⊢ 𝐸 = (Edg‘𝐺)
4	2, 3	cplgredgex 35105	. . . . . . . 8 ⊢ (𝐺 ∈ ComplGraph → ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ (𝑉 ∖ {𝐴})) → ∃𝑒 ∈ 𝐸 {𝐴, 𝐵} ⊆ 𝑒))
5	1, 4	syl 17	. . . . . . 7 ⊢ (𝐺 ∈ ComplUSGraph → ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ (𝑉 ∖ {𝐴})) → ∃𝑒 ∈ 𝐸 {𝐴, 𝐵} ⊆ 𝑒))
6	5	imp 406	. . . . . 6 ⊢ ((𝐺 ∈ ComplUSGraph ∧ (𝐴 ∈ 𝑉 ∧ 𝐵 ∈ (𝑉 ∖ {𝐴}))) → ∃𝑒 ∈ 𝐸 {𝐴, 𝐵} ⊆ 𝑒)
7		df-rex 3069	. . . . . 6 ⊢ (∃𝑒 ∈ 𝐸 {𝐴, 𝐵} ⊆ 𝑒 ↔ ∃𝑒(𝑒 ∈ 𝐸 ∧ {𝐴, 𝐵} ⊆ 𝑒))
8	6, 7	sylib 218	. . . . 5 ⊢ ((𝐺 ∈ ComplUSGraph ∧ (𝐴 ∈ 𝑉 ∧ 𝐵 ∈ (𝑉 ∖ {𝐴}))) → ∃𝑒(𝑒 ∈ 𝐸 ∧ {𝐴, 𝐵} ⊆ 𝑒))
9		eldifsni 4795	. . . . . . . . . . . . . . . 16 ⊢ (𝐵 ∈ (𝑉 ∖ {𝐴}) → 𝐵 ≠ 𝐴)
10	9	necomd 2994	. . . . . . . . . . . . . . 15 ⊢ (𝐵 ∈ (𝑉 ∖ {𝐴}) → 𝐴 ≠ 𝐵)
11	10	adantl 481	. . . . . . . . . . . . . 14 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ (𝑉 ∖ {𝐴})) → 𝐴 ≠ 𝐵)
12		hashprg 14431	. . . . . . . . . . . . . 14 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ (𝑉 ∖ {𝐴})) → (𝐴 ≠ 𝐵 ↔ (♯‘{𝐴, 𝐵}) = 2))
13	11, 12	mpbid 232	. . . . . . . . . . . . 13 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ (𝑉 ∖ {𝐴})) → (♯‘{𝐴, 𝐵}) = 2)
14	13	adantl 481	. . . . . . . . . . . 12 ⊢ (((𝐺 ∈ ComplUSGraph ∧ 𝑒 ∈ 𝐸) ∧ (𝐴 ∈ 𝑉 ∧ 𝐵 ∈ (𝑉 ∖ {𝐴}))) → (♯‘{𝐴, 𝐵}) = 2)
15		cusgrusgr 29451	. . . . . . . . . . . . . 14 ⊢ (𝐺 ∈ ComplUSGraph → 𝐺 ∈ USGraph)
16	3	usgredgppr 29228	. . . . . . . . . . . . . 14 ⊢ ((𝐺 ∈ USGraph ∧ 𝑒 ∈ 𝐸) → (♯‘𝑒) = 2)
17	15, 16	sylan 580	. . . . . . . . . . . . 13 ⊢ ((𝐺 ∈ ComplUSGraph ∧ 𝑒 ∈ 𝐸) → (♯‘𝑒) = 2)
18	17	adantr 480	. . . . . . . . . . . 12 ⊢ (((𝐺 ∈ ComplUSGraph ∧ 𝑒 ∈ 𝐸) ∧ (𝐴 ∈ 𝑉 ∧ 𝐵 ∈ (𝑉 ∖ {𝐴}))) → (♯‘𝑒) = 2)
19	14, 18	eqtr4d 2778	. . . . . . . . . . 11 ⊢ (((𝐺 ∈ ComplUSGraph ∧ 𝑒 ∈ 𝐸) ∧ (𝐴 ∈ 𝑉 ∧ 𝐵 ∈ (𝑉 ∖ {𝐴}))) → (♯‘{𝐴, 𝐵}) = (♯‘𝑒))
20		simpl 482	. . . . . . . . . . 11 ⊢ (((𝐺 ∈ ComplUSGraph ∧ 𝑒 ∈ 𝐸) ∧ (𝐴 ∈ 𝑉 ∧ 𝐵 ∈ (𝑉 ∖ {𝐴}))) → (𝐺 ∈ ComplUSGraph ∧ 𝑒 ∈ 𝐸))
21		vex 3482	. . . . . . . . . . . . . . . 16 ⊢ 𝑒 ∈ V
22		2nn0 12541	. . . . . . . . . . . . . . . 16 ⊢ 2 ∈ ℕ0
23		hashvnfin 14396	. . . . . . . . . . . . . . . 16 ⊢ ((𝑒 ∈ V ∧ 2 ∈ ℕ0) → ((♯‘𝑒) = 2 → 𝑒 ∈ Fin))
24	21, 22, 23	mp2an 692	. . . . . . . . . . . . . . 15 ⊢ ((♯‘𝑒) = 2 → 𝑒 ∈ Fin)
25	17, 24	syl 17	. . . . . . . . . . . . . 14 ⊢ ((𝐺 ∈ ComplUSGraph ∧ 𝑒 ∈ 𝐸) → 𝑒 ∈ Fin)
26		fisshasheq 35099	. . . . . . . . . . . . . 14 ⊢ ((𝑒 ∈ Fin ∧ {𝐴, 𝐵} ⊆ 𝑒 ∧ (♯‘{𝐴, 𝐵}) = (♯‘𝑒)) → {𝐴, 𝐵} = 𝑒)
27	25, 26	syl3an1 1162	. . . . . . . . . . . . 13 ⊢ (((𝐺 ∈ ComplUSGraph ∧ 𝑒 ∈ 𝐸) ∧ {𝐴, 𝐵} ⊆ 𝑒 ∧ (♯‘{𝐴, 𝐵}) = (♯‘𝑒)) → {𝐴, 𝐵} = 𝑒)
28	27	3comr 1124	. . . . . . . . . . . 12 ⊢ (((♯‘{𝐴, 𝐵}) = (♯‘𝑒) ∧ (𝐺 ∈ ComplUSGraph ∧ 𝑒 ∈ 𝐸) ∧ {𝐴, 𝐵} ⊆ 𝑒) → {𝐴, 𝐵} = 𝑒)
29	28	3exp 1118	. . . . . . . . . . 11 ⊢ ((♯‘{𝐴, 𝐵}) = (♯‘𝑒) → ((𝐺 ∈ ComplUSGraph ∧ 𝑒 ∈ 𝐸) → ({𝐴, 𝐵} ⊆ 𝑒 → {𝐴, 𝐵} = 𝑒)))
30	19, 20, 29	sylc 65	. . . . . . . . . 10 ⊢ (((𝐺 ∈ ComplUSGraph ∧ 𝑒 ∈ 𝐸) ∧ (𝐴 ∈ 𝑉 ∧ 𝐵 ∈ (𝑉 ∖ {𝐴}))) → ({𝐴, 𝐵} ⊆ 𝑒 → {𝐴, 𝐵} = 𝑒))
31	30	3impa 1109	. . . . . . . . 9 ⊢ ((𝐺 ∈ ComplUSGraph ∧ 𝑒 ∈ 𝐸 ∧ (𝐴 ∈ 𝑉 ∧ 𝐵 ∈ (𝑉 ∖ {𝐴}))) → ({𝐴, 𝐵} ⊆ 𝑒 → {𝐴, 𝐵} = 𝑒))
32	31	3com23 1125	. . . . . . . 8 ⊢ ((𝐺 ∈ ComplUSGraph ∧ (𝐴 ∈ 𝑉 ∧ 𝐵 ∈ (𝑉 ∖ {𝐴})) ∧ 𝑒 ∈ 𝐸) → ({𝐴, 𝐵} ⊆ 𝑒 → {𝐴, 𝐵} = 𝑒))
33	32	3expia 1120	. . . . . . 7 ⊢ ((𝐺 ∈ ComplUSGraph ∧ (𝐴 ∈ 𝑉 ∧ 𝐵 ∈ (𝑉 ∖ {𝐴}))) → (𝑒 ∈ 𝐸 → ({𝐴, 𝐵} ⊆ 𝑒 → {𝐴, 𝐵} = 𝑒)))
34	33	imdistand 570	. . . . . 6 ⊢ ((𝐺 ∈ ComplUSGraph ∧ (𝐴 ∈ 𝑉 ∧ 𝐵 ∈ (𝑉 ∖ {𝐴}))) → ((𝑒 ∈ 𝐸 ∧ {𝐴, 𝐵} ⊆ 𝑒) → (𝑒 ∈ 𝐸 ∧ {𝐴, 𝐵} = 𝑒)))
35	34	eximdv 1915	. . . . 5 ⊢ ((𝐺 ∈ ComplUSGraph ∧ (𝐴 ∈ 𝑉 ∧ 𝐵 ∈ (𝑉 ∖ {𝐴}))) → (∃𝑒(𝑒 ∈ 𝐸 ∧ {𝐴, 𝐵} ⊆ 𝑒) → ∃𝑒(𝑒 ∈ 𝐸 ∧ {𝐴, 𝐵} = 𝑒)))
36	8, 35	mpd 15	. . . 4 ⊢ ((𝐺 ∈ ComplUSGraph ∧ (𝐴 ∈ 𝑉 ∧ 𝐵 ∈ (𝑉 ∖ {𝐴}))) → ∃𝑒(𝑒 ∈ 𝐸 ∧ {𝐴, 𝐵} = 𝑒))
37		pm3.22 459	. . . . . 6 ⊢ ((𝑒 ∈ 𝐸 ∧ {𝐴, 𝐵} = 𝑒) → ({𝐴, 𝐵} = 𝑒 ∧ 𝑒 ∈ 𝐸))
38		eqcom 2742	. . . . . . 7 ⊢ ({𝐴, 𝐵} = 𝑒 ↔ 𝑒 = {𝐴, 𝐵})
39	38	anbi1i 624	. . . . . 6 ⊢ (({𝐴, 𝐵} = 𝑒 ∧ 𝑒 ∈ 𝐸) ↔ (𝑒 = {𝐴, 𝐵} ∧ 𝑒 ∈ 𝐸))
40	37, 39	sylib 218	. . . . 5 ⊢ ((𝑒 ∈ 𝐸 ∧ {𝐴, 𝐵} = 𝑒) → (𝑒 = {𝐴, 𝐵} ∧ 𝑒 ∈ 𝐸))
41	40	eximi 1832	. . . 4 ⊢ (∃𝑒(𝑒 ∈ 𝐸 ∧ {𝐴, 𝐵} = 𝑒) → ∃𝑒(𝑒 = {𝐴, 𝐵} ∧ 𝑒 ∈ 𝐸))
42	36, 41	syl 17	. . 3 ⊢ ((𝐺 ∈ ComplUSGraph ∧ (𝐴 ∈ 𝑉 ∧ 𝐵 ∈ (𝑉 ∖ {𝐴}))) → ∃𝑒(𝑒 = {𝐴, 𝐵} ∧ 𝑒 ∈ 𝐸))
43		prex 5443	. . . 4 ⊢ {𝐴, 𝐵} ∈ V
44		eleq1 2827	. . . 4 ⊢ (𝑒 = {𝐴, 𝐵} → (𝑒 ∈ 𝐸 ↔ {𝐴, 𝐵} ∈ 𝐸))
45	43, 44	ceqsexv 3530	. . 3 ⊢ (∃𝑒(𝑒 = {𝐴, 𝐵} ∧ 𝑒 ∈ 𝐸) ↔ {𝐴, 𝐵} ∈ 𝐸)
46	42, 45	sylib 218	. 2 ⊢ ((𝐺 ∈ ComplUSGraph ∧ (𝐴 ∈ 𝑉 ∧ 𝐵 ∈ (𝑉 ∖ {𝐴}))) → {𝐴, 𝐵} ∈ 𝐸)
47	46	ex 412	1 ⊢ (𝐺 ∈ ComplUSGraph → ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ (𝑉 ∖ {𝐴})) → {𝐴, 𝐵} ∈ 𝐸))

Syntax hints:   → wi 4   ∧ wa 395   = wceq 1537  ∃wex 1776   ∈ wcel 2106   ≠ wne 2938  ∃wrex 3068  Vcvv 3478   ∖ cdif 3960   ⊆ wss 3963  {csn 4631  {cpr 4633  ‘cfv 6563  Fincfn 8984  2c2 12319  ℕ₀cn0 12524  ♯chash 14366  Vtxcvtx 29028  Edgcedg 29079  USGraphcusgr 29181  ComplGraphccplgr 29441  ComplUSGraphccusgr 29442

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1792  ax-4 1806  ax-5 1908  ax-6 1965  ax-7 2005  ax-8 2108  ax-9 2116  ax-10 2139  ax-11 2155  ax-12 2175  ax-ext 2706  ax-sep 5302  ax-nul 5312  ax-pow 5371  ax-pr 5438  ax-un 7754  ax-cnex 11209  ax-resscn 11210  ax-1cn 11211  ax-icn 11212  ax-addcl 11213  ax-addrcl 11214  ax-mulcl 11215  ax-mulrcl 11216  ax-mulcom 11217  ax-addass 11218  ax-mulass 11219  ax-distr 11220  ax-i2m1 11221  ax-1ne0 11222  ax-1rid 11223  ax-rnegex 11224  ax-rrecex 11225  ax-cnre 11226  ax-pre-lttri 11227  ax-pre-lttrn 11228  ax-pre-ltadd 11229  ax-pre-mulgt0 11230

This theorem depends on definitions:  df-bi 207  df-an 396  df-or 848  df-3or 1087  df-3an 1088  df-tru 1540  df-fal 1550  df-ex 1777  df-nf 1781  df-sb 2063  df-mo 2538  df-eu 2567  df-clab 2713  df-cleq 2727  df-clel 2814  df-nfc 2890  df-ne 2939  df-nel 3045  df-ral 3060  df-rex 3069  df-reu 3379  df-rab 3434  df-v 3480  df-sbc 3792  df-csb 3909  df-dif 3966  df-un 3968  df-in 3970  df-ss 3980  df-pss 3983  df-nul 4340  df-if 4532  df-pw 4607  df-sn 4632  df-pr 4634  df-op 4638  df-uni 4913  df-int 4952  df-iun 4998  df-br 5149  df-opab 5211  df-mpt 5232  df-tr 5266  df-id 5583  df-eprel 5589  df-po 5597  df-so 5598  df-fr 5641  df-we 5643  df-xp 5695  df-rel 5696  df-cnv 5697  df-co 5698  df-dm 5699  df-rn 5700  df-res 5701  df-ima 5702  df-pred 6323  df-ord 6389  df-on 6390  df-lim 6391  df-suc 6392  df-iota 6516  df-fun 6565  df-fn 6566  df-f 6567  df-f1 6568  df-fo 6569  df-f1o 6570  df-fv 6571  df-riota 7388  df-ov 7434  df-oprab 7435  df-mpo 7436  df-om 7888  df-1st 8013  df-2nd 8014  df-frecs 8305  df-wrecs 8336  df-recs 8410  df-rdg 8449  df-1o 8505  df-oadd 8509  df-er 8744  df-en 8985  df-dom 8986  df-sdom 8987  df-fin 8988  df-dju 9939  df-card 9977  df-pnf 11295  df-mnf 11296  df-xr 11297  df-ltxr 11298  df-le 11299  df-sub 11492  df-neg 11493  df-nn 12265  df-2 12327  df-n0 12525  df-z 12612  df-uz 12877  df-fz 13545  df-hash 14367  df-edg 29080  df-usgr 29183  df-nbgr 29365  df-uvtx 29418  df-cplgr 29443  df-cusgr 29444

This theorem is referenced by:  cusgredgex2  35107