Theorem cusgredgex 35626

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 29785	. . . . . . . 8 ⊢ (𝐺 ∈ ComplUSGraph → 𝐺 ∈ ComplGraph)
2		cusgredgex.1	. . . . . . . . 9 ⊢ 𝑉 = (Vtx‘𝐺)
3		cusgredgex.2	. . . . . . . . 9 ⊢ 𝐸 = (Edg‘𝐺)
4	2, 3	cplgredgex 35625	. . . . . . . 8 ⊢ (𝐺 ∈ ComplGraph → ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ (𝑉 ∖ {𝐴})) → ∃𝑒 ∈ 𝐸 {𝐴, 𝐵} ⊆ 𝑒))
5	1, 4	syl 18	. . . . . . 7 ⊢ (𝐺 ∈ ComplUSGraph → ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ (𝑉 ∖ {𝐴})) → ∃𝑒 ∈ 𝐸 {𝐴, 𝐵} ⊆ 𝑒))
6	5	imp 412	. . . . . 6 ⊢ ((𝐺 ∈ ComplUSGraph ∧ (𝐴 ∈ 𝑉 ∧ 𝐵 ∈ (𝑉 ∖ {𝐴}))) → ∃𝑒 ∈ 𝐸 {𝐴, 𝐵} ⊆ 𝑒)
7		df-rex 3093	. . . . . 6 ⊢ (∃𝑒 ∈ 𝐸 {𝐴, 𝐵} ⊆ 𝑒 ↔ ∃𝑒(𝑒 ∈ 𝐸 ∧ {𝐴, 𝐵} ⊆ 𝑒))
8	6, 7	sylib 221	. . . . 5 ⊢ ((𝐺 ∈ ComplUSGraph ∧ (𝐴 ∈ 𝑉 ∧ 𝐵 ∈ (𝑉 ∖ {𝐴}))) → ∃𝑒(𝑒 ∈ 𝐸 ∧ {𝐴, 𝐵} ⊆ 𝑒))
9		eldifsni 4761	. . . . . . . . . . . . . . . 16 ⊢ (𝐵 ∈ (𝑉 ∖ {𝐴}) → 𝐵 ≠ 𝐴)
10	9	necomd 3016	. . . . . . . . . . . . . . 15 ⊢ (𝐵 ∈ (𝑉 ∖ {𝐴}) → 𝐴 ≠ 𝐵)
11	10	adantl 487	. . . . . . . . . . . . . 14 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ (𝑉 ∖ {𝐴})) → 𝐴 ≠ 𝐵)
12		hashprg 14442	. . . . . . . . . . . . . 14 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ (𝑉 ∖ {𝐴})) → (𝐴 ≠ 𝐵 ↔ (♯‘{𝐴, 𝐵}) = 2))
13	11, 12	mpbid 235	. . . . . . . . . . . . 13 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ (𝑉 ∖ {𝐴})) → (♯‘{𝐴, 𝐵}) = 2)
14	13	adantl 487	. . . . . . . . . . . 12 ⊢ (((𝐺 ∈ ComplUSGraph ∧ 𝑒 ∈ 𝐸) ∧ (𝐴 ∈ 𝑉 ∧ 𝐵 ∈ (𝑉 ∖ {𝐴}))) → (♯‘{𝐴, 𝐵}) = 2)
15		cusgrusgr 29784	. . . . . . . . . . . . . 14 ⊢ (𝐺 ∈ ComplUSGraph → 𝐺 ∈ USGraph)
16	3	usgredgppr 29561	. . . . . . . . . . . . . 14 ⊢ ((𝐺 ∈ USGraph ∧ 𝑒 ∈ 𝐸) → (♯‘𝑒) = 2)
17	15, 16	sylan 592	. . . . . . . . . . . . 13 ⊢ ((𝐺 ∈ ComplUSGraph ∧ 𝑒 ∈ 𝐸) → (♯‘𝑒) = 2)
18	17	adantr 486	. . . . . . . . . . . 12 ⊢ (((𝐺 ∈ ComplUSGraph ∧ 𝑒 ∈ 𝐸) ∧ (𝐴 ∈ 𝑉 ∧ 𝐵 ∈ (𝑉 ∖ {𝐴}))) → (♯‘𝑒) = 2)
19	14, 18	eqtr4d 2804	. . . . . . . . . . 11 ⊢ (((𝐺 ∈ ComplUSGraph ∧ 𝑒 ∈ 𝐸) ∧ (𝐴 ∈ 𝑉 ∧ 𝐵 ∈ (𝑉 ∖ {𝐴}))) → (♯‘{𝐴, 𝐵}) = (♯‘𝑒))
20		simpl 488	. . . . . . . . . . 11 ⊢ (((𝐺 ∈ ComplUSGraph ∧ 𝑒 ∈ 𝐸) ∧ (𝐴 ∈ 𝑉 ∧ 𝐵 ∈ (𝑉 ∖ {𝐴}))) → (𝐺 ∈ ComplUSGraph ∧ 𝑒 ∈ 𝐸))
21		vex 3462	. . . . . . . . . . . . . . . 16 ⊢ 𝑒 ∈ V
22		2nn0 12531	. . . . . . . . . . . . . . . 16 ⊢ 2 ∈ ℕ0
23		hashvnfin 14407	. . . . . . . . . . . . . . . 16 ⊢ ((𝑒 ∈ V ∧ 2 ∈ ℕ0) → ((♯‘𝑒) = 2 → 𝑒 ∈ Fin))
24	21, 22, 23	mp2an 705	. . . . . . . . . . . . . . 15 ⊢ ((♯‘𝑒) = 2 → 𝑒 ∈ Fin)
25	17, 24	syl 18	. . . . . . . . . . . . . 14 ⊢ ((𝐺 ∈ ComplUSGraph ∧ 𝑒 ∈ 𝐸) → 𝑒 ∈ Fin)
26		fisshasheq 35618	. . . . . . . . . . . . . 14 ⊢ ((𝑒 ∈ Fin ∧ {𝐴, 𝐵} ⊆ 𝑒 ∧ (♯‘{𝐴, 𝐵}) = (♯‘𝑒)) → {𝐴, 𝐵} = 𝑒)
27	25, 26	syl3an1 1181	. . . . . . . . . . . . 13 ⊢ (((𝐺 ∈ ComplUSGraph ∧ 𝑒 ∈ 𝐸) ∧ {𝐴, 𝐵} ⊆ 𝑒 ∧ (♯‘{𝐴, 𝐵}) = (♯‘𝑒)) → {𝐴, 𝐵} = 𝑒)
28	27	3comr 1143	. . . . . . . . . . . 12 ⊢ (((♯‘{𝐴, 𝐵}) = (♯‘𝑒) ∧ (𝐺 ∈ ComplUSGraph ∧ 𝑒 ∈ 𝐸) ∧ {𝐴, 𝐵} ⊆ 𝑒) → {𝐴, 𝐵} = 𝑒)
29	28	3exp 1137	. . . . . . . . . . 11 ⊢ ((♯‘{𝐴, 𝐵}) = (♯‘𝑒) → ((𝐺 ∈ ComplUSGraph ∧ 𝑒 ∈ 𝐸) → ({𝐴, 𝐵} ⊆ 𝑒 → {𝐴, 𝐵} = 𝑒)))
30	19, 20, 29	sylc 66	. . . . . . . . . 10 ⊢ (((𝐺 ∈ ComplUSGraph ∧ 𝑒 ∈ 𝐸) ∧ (𝐴 ∈ 𝑉 ∧ 𝐵 ∈ (𝑉 ∖ {𝐴}))) → ({𝐴, 𝐵} ⊆ 𝑒 → {𝐴, 𝐵} = 𝑒))
31	30	3impa 1127	. . . . . . . . 9 ⊢ ((𝐺 ∈ ComplUSGraph ∧ 𝑒 ∈ 𝐸 ∧ (𝐴 ∈ 𝑉 ∧ 𝐵 ∈ (𝑉 ∖ {𝐴}))) → ({𝐴, 𝐵} ⊆ 𝑒 → {𝐴, 𝐵} = 𝑒))
32	31	3com23 1144	. . . . . . . 8 ⊢ ((𝐺 ∈ ComplUSGraph ∧ (𝐴 ∈ 𝑉 ∧ 𝐵 ∈ (𝑉 ∖ {𝐴})) ∧ 𝑒 ∈ 𝐸) → ({𝐴, 𝐵} ⊆ 𝑒 → {𝐴, 𝐵} = 𝑒))
33	32	3expia 1139	. . . . . . 7 ⊢ ((𝐺 ∈ ComplUSGraph ∧ (𝐴 ∈ 𝑉 ∧ 𝐵 ∈ (𝑉 ∖ {𝐴}))) → (𝑒 ∈ 𝐸 → ({𝐴, 𝐵} ⊆ 𝑒 → {𝐴, 𝐵} = 𝑒)))
34	33	imdistand 581	. . . . . 6 ⊢ ((𝐺 ∈ ComplUSGraph ∧ (𝐴 ∈ 𝑉 ∧ 𝐵 ∈ (𝑉 ∖ {𝐴}))) → ((𝑒 ∈ 𝐸 ∧ {𝐴, 𝐵} ⊆ 𝑒) → (𝑒 ∈ 𝐸 ∧ {𝐴, 𝐵} = 𝑒)))
35	34	eximdv 1950	. . . . 5 ⊢ ((𝐺 ∈ ComplUSGraph ∧ (𝐴 ∈ 𝑉 ∧ 𝐵 ∈ (𝑉 ∖ {𝐴}))) → (∃𝑒(𝑒 ∈ 𝐸 ∧ {𝐴, 𝐵} ⊆ 𝑒) → ∃𝑒(𝑒 ∈ 𝐸 ∧ {𝐴, 𝐵} = 𝑒)))
36	8, 35	mpd 16	. . . 4 ⊢ ((𝐺 ∈ ComplUSGraph ∧ (𝐴 ∈ 𝑉 ∧ 𝐵 ∈ (𝑉 ∖ {𝐴}))) → ∃𝑒(𝑒 ∈ 𝐸 ∧ {𝐴, 𝐵} = 𝑒))
37		pm3.22 465	. . . . . 6 ⊢ ((𝑒 ∈ 𝐸 ∧ {𝐴, 𝐵} = 𝑒) → ({𝐴, 𝐵} = 𝑒 ∧ 𝑒 ∈ 𝐸))
38		eqcom 2773	. . . . . . 7 ⊢ ({𝐴, 𝐵} = 𝑒 ↔ 𝑒 = {𝐴, 𝐵})
39	38	anbi1i 636	. . . . . 6 ⊢ (({𝐴, 𝐵} = 𝑒 ∧ 𝑒 ∈ 𝐸) ↔ (𝑒 = {𝐴, 𝐵} ∧ 𝑒 ∈ 𝐸))
40	37, 39	sylib 221	. . . . 5 ⊢ ((𝑒 ∈ 𝐸 ∧ {𝐴, 𝐵} = 𝑒) → (𝑒 = {𝐴, 𝐵} ∧ 𝑒 ∈ 𝐸))
41	40	eximi 1868	. . . 4 ⊢ (∃𝑒(𝑒 ∈ 𝐸 ∧ {𝐴, 𝐵} = 𝑒) → ∃𝑒(𝑒 = {𝐴, 𝐵} ∧ 𝑒 ∈ 𝐸))
42	36, 41	syl 18	. . 3 ⊢ ((𝐺 ∈ ComplUSGraph ∧ (𝐴 ∈ 𝑉 ∧ 𝐵 ∈ (𝑉 ∖ {𝐴}))) → ∃𝑒(𝑒 = {𝐴, 𝐵} ∧ 𝑒 ∈ 𝐸))
43		prex 5412	. . . 4 ⊢ {𝐴, 𝐵} ∈ V
44		eleq1 2854	. . . 4 ⊢ (𝑒 = {𝐴, 𝐵} → (𝑒 ∈ 𝐸 ↔ {𝐴, 𝐵} ∈ 𝐸))
45	43, 44	ceqsexv 3506	. . 3 ⊢ (∃𝑒(𝑒 = {𝐴, 𝐵} ∧ 𝑒 ∈ 𝐸) ↔ {𝐴, 𝐵} ∈ 𝐸)
46	42, 45	sylib 221	. 2 ⊢ ((𝐺 ∈ ComplUSGraph ∧ (𝐴 ∈ 𝑉 ∧ 𝐵 ∈ (𝑉 ∖ {𝐴}))) → {𝐴, 𝐵} ∈ 𝐸)
47	46	ex 418	1 ⊢ (𝐺 ∈ ComplUSGraph → ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ (𝑉 ∖ {𝐴})) → {𝐴, 𝐵} ∈ 𝐸))

This proof depends on syntax axioms:   → wi 4   ∧ wa 401   = wceq 1570  ∃wex 1812   ∈ wcel 2146   ≠ wne 2961  ∃wrex 3092  Vcvv 3458   ∖ cdif 3905   ⊆ wss 3908  {csn 4592  {cpr 4594  ‘cfv 6540  Fincfn 8945  2c2 12305  ℕ₀cn0 12514  ♯chash 14377  Vtxcvtx 29361  Edgcedg 29412  USGraphcusgr 29514  ComplGraphccplgr 29774  ComplUSGraphccusgr 29775

This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1828  ax-4 1842  ax-5 1943  ax-6 2000  ax-7 2041  ax-8 2148  ax-9 2156  ax-10 2179  ax-11 2195  ax-12 2216  ax-ext 2738  ax-sep 5260  ax-nul 5272  ax-pow 5339  ax-pr 5407  ax-un 7738  ax-cnex 11166  ax-resscn 11167  ax-1cn 11168  ax-icn 11169  ax-addcl 11170  ax-addrcl 11171  ax-mulcl 11172  ax-mulrcl 11173  ax-mulcom 11174  ax-addass 11175  ax-mulass 11176  ax-distr 11177  ax-i2m1 11178  ax-1ne0 11179  ax-1rid 11180  ax-rnegex 11181  ax-rrecex 11182  ax-cnre 11183  ax-pre-lttri 11184  ax-pre-lttrn 11185  ax-pre-ltadd 11186  ax-pre-mulgt0 11187

This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3or 1104  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1813  df-nf 1817  df-sb 2100  df-mo 2570  df-eu 2600  df-clab 2745  df-cleq 2758  df-clel 2841  df-nfc 2915  df-ne 2962  df-nel 3068  df-ral 3083  df-rex 3093  df-reu 3373  df-rab 3420  df-v 3460  df-sbc 3748  df-csb 3857  df-dif 3911  df-un 3913  df-in 3915  df-ss 3925  df-pss 3928  df-nul 4290  df-if 4491  df-pw 4567  df-sn 4593  df-pr 4595  df-op 4599  df-uni 4876  df-int 4916  df-iun 4961  df-br 5113  df-opab 5177  df-mpt 5196  df-tr 5222  df-id 5559  df-eprel 5564  df-po 5572  df-so 5573  df-fr 5617  df-we 5619  df-xp 5670  df-rel 5671  df-cnv 5672  df-co 5673  df-dm 5674  df-rn 5675  df-res 5676  df-ima 5677  df-pred 6306  df-ord 6367  df-on 6368  df-lim 6369  df-suc 6370  df-iota 6496  df-fun 6542  df-fn 6543  df-f 6544  df-f1 6545  df-fo 6546  df-f1o 6547  df-fv 6548  df-riota 7373  df-ov 7419  df-oprab 7420  df-mpo 7421  df-om 7865  df-1st 7988  df-2nd 7989  df-frecs 8280  df-wrecs 8311  df-recs 8360  df-rdg 8399  df-1o 8455  df-oadd 8459  df-er 8696  df-en 8946  df-dom 8947  df-sdom 8948  df-fin 8949  df-dju 9898  df-card 9936  df-pnf 11255  df-mnf 11256  df-xr 11257  df-ltxr 11258  df-le 11259  df-sub 11453  df-neg 11454  df-nn 12244  df-2 12313  df-n0 12515  df-z 12602  df-uz 12873  df-fz 13546  df-hash 14378  df-edg 29413  df-usgr 29516  df-nbgr 29698  df-uvtx 29751  df-cplgr 29776  df-cusgr 29777

This theorem is used by:  cusgredgex2  35627