Theorem cusgredgex 34100

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 28666	. . . . . . . 8 ⊢ (𝐺 ∈ ComplUSGraph → 𝐺 ∈ ComplGraph)
2		cusgredgex.1	. . . . . . . . 9 ⊢ 𝑉 = (Vtx‘𝐺)
3		cusgredgex.2	. . . . . . . . 9 ⊢ 𝐸 = (Edg‘𝐺)
4	2, 3	cplgredgex 34099	. . . . . . . 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 407	. . . . . 6 ⊢ ((𝐺 ∈ ComplUSGraph ∧ (𝐴 ∈ 𝑉 ∧ 𝐵 ∈ (𝑉 ∖ {𝐴}))) → ∃𝑒 ∈ 𝐸 {𝐴, 𝐵} ⊆ 𝑒)
7		df-rex 3071	. . . . . 6 ⊢ (∃𝑒 ∈ 𝐸 {𝐴, 𝐵} ⊆ 𝑒 ↔ ∃𝑒(𝑒 ∈ 𝐸 ∧ {𝐴, 𝐵} ⊆ 𝑒))
8	6, 7	sylib 217	. . . . 5 ⊢ ((𝐺 ∈ ComplUSGraph ∧ (𝐴 ∈ 𝑉 ∧ 𝐵 ∈ (𝑉 ∖ {𝐴}))) → ∃𝑒(𝑒 ∈ 𝐸 ∧ {𝐴, 𝐵} ⊆ 𝑒))
9		eldifsni 4792	. . . . . . . . . . . . . . . 16 ⊢ (𝐵 ∈ (𝑉 ∖ {𝐴}) → 𝐵 ≠ 𝐴)
10	9	necomd 2996	. . . . . . . . . . . . . . 15 ⊢ (𝐵 ∈ (𝑉 ∖ {𝐴}) → 𝐴 ≠ 𝐵)
11	10	adantl 482	. . . . . . . . . . . . . 14 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ (𝑉 ∖ {𝐴})) → 𝐴 ≠ 𝐵)
12		hashprg 14351	. . . . . . . . . . . . . 14 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ (𝑉 ∖ {𝐴})) → (𝐴 ≠ 𝐵 ↔ (♯‘{𝐴, 𝐵}) = 2))
13	11, 12	mpbid 231	. . . . . . . . . . . . 13 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ (𝑉 ∖ {𝐴})) → (♯‘{𝐴, 𝐵}) = 2)
14	13	adantl 482	. . . . . . . . . . . 12 ⊢ (((𝐺 ∈ ComplUSGraph ∧ 𝑒 ∈ 𝐸) ∧ (𝐴 ∈ 𝑉 ∧ 𝐵 ∈ (𝑉 ∖ {𝐴}))) → (♯‘{𝐴, 𝐵}) = 2)
15		cusgrusgr 28665	. . . . . . . . . . . . . 14 ⊢ (𝐺 ∈ ComplUSGraph → 𝐺 ∈ USGraph)
16	3	usgredgppr 28442	. . . . . . . . . . . . . 14 ⊢ ((𝐺 ∈ USGraph ∧ 𝑒 ∈ 𝐸) → (♯‘𝑒) = 2)
17	15, 16	sylan 580	. . . . . . . . . . . . 13 ⊢ ((𝐺 ∈ ComplUSGraph ∧ 𝑒 ∈ 𝐸) → (♯‘𝑒) = 2)
18	17	adantr 481	. . . . . . . . . . . 12 ⊢ (((𝐺 ∈ ComplUSGraph ∧ 𝑒 ∈ 𝐸) ∧ (𝐴 ∈ 𝑉 ∧ 𝐵 ∈ (𝑉 ∖ {𝐴}))) → (♯‘𝑒) = 2)
19	14, 18	eqtr4d 2775	. . . . . . . . . . 11 ⊢ (((𝐺 ∈ ComplUSGraph ∧ 𝑒 ∈ 𝐸) ∧ (𝐴 ∈ 𝑉 ∧ 𝐵 ∈ (𝑉 ∖ {𝐴}))) → (♯‘{𝐴, 𝐵}) = (♯‘𝑒))
20		simpl 483	. . . . . . . . . . 11 ⊢ (((𝐺 ∈ ComplUSGraph ∧ 𝑒 ∈ 𝐸) ∧ (𝐴 ∈ 𝑉 ∧ 𝐵 ∈ (𝑉 ∖ {𝐴}))) → (𝐺 ∈ ComplUSGraph ∧ 𝑒 ∈ 𝐸))
21		vex 3478	. . . . . . . . . . . . . . . 16 ⊢ 𝑒 ∈ V
22		2nn0 12485	. . . . . . . . . . . . . . . 16 ⊢ 2 ∈ ℕ0
23		hashvnfin 14316	. . . . . . . . . . . . . . . 16 ⊢ ((𝑒 ∈ V ∧ 2 ∈ ℕ0) → ((♯‘𝑒) = 2 → 𝑒 ∈ Fin))
24	21, 22, 23	mp2an 690	. . . . . . . . . . . . . . 15 ⊢ ((♯‘𝑒) = 2 → 𝑒 ∈ Fin)
25	17, 24	syl 17	. . . . . . . . . . . . . 14 ⊢ ((𝐺 ∈ ComplUSGraph ∧ 𝑒 ∈ 𝐸) → 𝑒 ∈ Fin)
26		fisshasheq 34092	. . . . . . . . . . . . . 14 ⊢ ((𝑒 ∈ Fin ∧ {𝐴, 𝐵} ⊆ 𝑒 ∧ (♯‘{𝐴, 𝐵}) = (♯‘𝑒)) → {𝐴, 𝐵} = 𝑒)
27	25, 26	syl3an1 1163	. . . . . . . . . . . . 13 ⊢ (((𝐺 ∈ ComplUSGraph ∧ 𝑒 ∈ 𝐸) ∧ {𝐴, 𝐵} ⊆ 𝑒 ∧ (♯‘{𝐴, 𝐵}) = (♯‘𝑒)) → {𝐴, 𝐵} = 𝑒)
28	27	3comr 1125	. . . . . . . . . . . 12 ⊢ (((♯‘{𝐴, 𝐵}) = (♯‘𝑒) ∧ (𝐺 ∈ ComplUSGraph ∧ 𝑒 ∈ 𝐸) ∧ {𝐴, 𝐵} ⊆ 𝑒) → {𝐴, 𝐵} = 𝑒)
29	28	3exp 1119	. . . . . . . . . . 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 1110	. . . . . . . . 9 ⊢ ((𝐺 ∈ ComplUSGraph ∧ 𝑒 ∈ 𝐸 ∧ (𝐴 ∈ 𝑉 ∧ 𝐵 ∈ (𝑉 ∖ {𝐴}))) → ({𝐴, 𝐵} ⊆ 𝑒 → {𝐴, 𝐵} = 𝑒))
32	31	3com23 1126	. . . . . . . 8 ⊢ ((𝐺 ∈ ComplUSGraph ∧ (𝐴 ∈ 𝑉 ∧ 𝐵 ∈ (𝑉 ∖ {𝐴})) ∧ 𝑒 ∈ 𝐸) → ({𝐴, 𝐵} ⊆ 𝑒 → {𝐴, 𝐵} = 𝑒))
33	32	3expia 1121	. . . . . . 7 ⊢ ((𝐺 ∈ ComplUSGraph ∧ (𝐴 ∈ 𝑉 ∧ 𝐵 ∈ (𝑉 ∖ {𝐴}))) → (𝑒 ∈ 𝐸 → ({𝐴, 𝐵} ⊆ 𝑒 → {𝐴, 𝐵} = 𝑒)))
34	33	imdistand 571	. . . . . 6 ⊢ ((𝐺 ∈ ComplUSGraph ∧ (𝐴 ∈ 𝑉 ∧ 𝐵 ∈ (𝑉 ∖ {𝐴}))) → ((𝑒 ∈ 𝐸 ∧ {𝐴, 𝐵} ⊆ 𝑒) → (𝑒 ∈ 𝐸 ∧ {𝐴, 𝐵} = 𝑒)))
35	34	eximdv 1920	. . . . 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		pm3.22 460	. . . . . 6 ⊢ ((𝑒 ∈ 𝐸 ∧ {𝐴, 𝐵} = 𝑒) → ({𝐴, 𝐵} = 𝑒 ∧ 𝑒 ∈ 𝐸))
38		eqcom 2739	. . . . . . 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 217	. . . . 5 ⊢ ((𝑒 ∈ 𝐸 ∧ {𝐴, 𝐵} = 𝑒) → (𝑒 = {𝐴, 𝐵} ∧ 𝑒 ∈ 𝐸))
41	40	eximi 1837	. . . 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 5431	. . . 4 ⊢ {𝐴, 𝐵} ∈ V
44		eleq1 2821	. . . 4 ⊢ (𝑒 = {𝐴, 𝐵} → (𝑒 ∈ 𝐸 ↔ {𝐴, 𝐵} ∈ 𝐸))
45	43, 44	ceqsexv 3525	. . 3 ⊢ (∃𝑒(𝑒 = {𝐴, 𝐵} ∧ 𝑒 ∈ 𝐸) ↔ {𝐴, 𝐵} ∈ 𝐸)
46	42, 45	sylib 217	. 2 ⊢ ((𝐺 ∈ ComplUSGraph ∧ (𝐴 ∈ 𝑉 ∧ 𝐵 ∈ (𝑉 ∖ {𝐴}))) → {𝐴, 𝐵} ∈ 𝐸)
47	46	ex 413	1 ⊢ (𝐺 ∈ ComplUSGraph → ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ (𝑉 ∖ {𝐴})) → {𝐴, 𝐵} ∈ 𝐸))

Syntax hints:   → wi 4   ∧ wa 396   = wceq 1541  ∃wex 1781   ∈ wcel 2106   ≠ wne 2940  ∃wrex 3070  Vcvv 3474   ∖ cdif 3944   ⊆ wss 3947  {csn 4627  {cpr 4629  ‘cfv 6540  Fincfn 8935  2c2 12263  ℕ₀cn0 12468  ♯chash 14286  Vtxcvtx 28245  Edgcedg 28296  USGraphcusgr 28398  ComplGraphccplgr 28655  ComplUSGraphccusgr 28656

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1797  ax-4 1811  ax-5 1913  ax-6 1971  ax-7 2011  ax-8 2108  ax-9 2116  ax-10 2137  ax-11 2154  ax-12 2171  ax-ext 2703  ax-sep 5298  ax-nul 5305  ax-pow 5362  ax-pr 5426  ax-un 7721  ax-cnex 11162  ax-resscn 11163  ax-1cn 11164  ax-icn 11165  ax-addcl 11166  ax-addrcl 11167  ax-mulcl 11168  ax-mulrcl 11169  ax-mulcom 11170  ax-addass 11171  ax-mulass 11172  ax-distr 11173  ax-i2m1 11174  ax-1ne0 11175  ax-1rid 11176  ax-rnegex 11177  ax-rrecex 11178  ax-cnre 11179  ax-pre-lttri 11180  ax-pre-lttrn 11181  ax-pre-ltadd 11182  ax-pre-mulgt0 11183

This theorem depends on definitions:  df-bi 206  df-an 397  df-or 846  df-3or 1088  df-3an 1089  df-tru 1544  df-fal 1554  df-ex 1782  df-nf 1786  df-sb 2068  df-mo 2534  df-eu 2563  df-clab 2710  df-cleq 2724  df-clel 2810  df-nfc 2885  df-ne 2941  df-nel 3047  df-ral 3062  df-rex 3071  df-reu 3377  df-rab 3433  df-v 3476  df-sbc 3777  df-csb 3893  df-dif 3950  df-un 3952  df-in 3954  df-ss 3964  df-pss 3966  df-nul 4322  df-if 4528  df-pw 4603  df-sn 4628  df-pr 4630  df-op 4634  df-uni 4908  df-int 4950  df-iun 4998  df-br 5148  df-opab 5210  df-mpt 5231  df-tr 5265  df-id 5573  df-eprel 5579  df-po 5587  df-so 5588  df-fr 5630  df-we 5632  df-xp 5681  df-rel 5682  df-cnv 5683  df-co 5684  df-dm 5685  df-rn 5686  df-res 5687  df-ima 5688  df-pred 6297  df-ord 6364  df-on 6365  df-lim 6366  df-suc 6367  df-iota 6492  df-fun 6542  df-fn 6543  df-f 6544  df-f1 6545  df-fo 6546  df-f1o 6547  df-fv 6548  df-riota 7361  df-ov 7408  df-oprab 7409  df-mpo 7410  df-om 7852  df-1st 7971  df-2nd 7972  df-frecs 8262  df-wrecs 8293  df-recs 8367  df-rdg 8406  df-1o 8462  df-oadd 8466  df-er 8699  df-en 8936  df-dom 8937  df-sdom 8938  df-fin 8939  df-dju 9892  df-card 9930  df-pnf 11246  df-mnf 11247  df-xr 11248  df-ltxr 11249  df-le 11250  df-sub 11442  df-neg 11443  df-nn 12209  df-2 12271  df-n0 12469  df-z 12555  df-uz 12819  df-fz 13481  df-hash 14287  df-edg 28297  df-usgr 28400  df-nbgr 28579  df-uvtx 28632  df-cplgr 28657  df-cusgr 28658

This theorem is referenced by:  cusgredgex2  34101