Theorem sizusglecusg 26359

Description: The size of a simple graph with 𝑛 vertices is at most the size of a complete simple graph with 𝑛 vertices (𝑛 may be infinite). (Contributed by Alexander van der Vekens, 13-Jan-2018.) (Revised by AV, 13-Nov-2020.)

Hypotheses

Ref	Expression
fusgrmaxsize.v	⊢ 𝑉 = (Vtx‘𝐺)
fusgrmaxsize.e	⊢ 𝐸 = (Edg‘𝐺)
usgrsscusgra.h	⊢ 𝑉 = (Vtx‘𝐻)
usgrsscusgra.f	⊢ 𝐹 = (Edg‘𝐻)

Assertion

Ref	Expression
sizusglecusg	⊢ ((𝐺 ∈ USGraph ∧ 𝐻 ∈ ComplUSGraph) → (#‘𝐸) ≤ (#‘𝐹))

Proof of Theorem sizusglecusg

Dummy variable 𝑓 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		fusgrmaxsize.e	. . . . . . . . 9 ⊢ 𝐸 = (Edg‘𝐺)
2		fvex 6201	. . . . . . . . 9 ⊢ (Edg‘𝐺) ∈ V
3	1, 2	eqeltri 2697	. . . . . . . 8 ⊢ 𝐸 ∈ V
4		resiexg 7102	. . . . . . . 8 ⊢ (𝐸 ∈ V → ( I ↾ 𝐸) ∈ V)
5	3, 4	mp1i 13	. . . . . . 7 ⊢ ((𝐺 ∈ USGraph ∧ 𝐻 ∈ ComplUSGraph) → ( I ↾ 𝐸) ∈ V)
6		fusgrmaxsize.v	. . . . . . . 8 ⊢ 𝑉 = (Vtx‘𝐺)
7		usgrsscusgra.h	. . . . . . . 8 ⊢ 𝑉 = (Vtx‘𝐻)
8		usgrsscusgra.f	. . . . . . . 8 ⊢ 𝐹 = (Edg‘𝐻)
9	6, 1, 7, 8	sizusglecusglem1 26357	. . . . . . 7 ⊢ ((𝐺 ∈ USGraph ∧ 𝐻 ∈ ComplUSGraph) → ( I ↾ 𝐸):𝐸–1-1→𝐹)
10		f1eq1 6096	. . . . . . . 8 ⊢ (𝑓 = ( I ↾ 𝐸) → (𝑓:𝐸–1-1→𝐹 ↔ ( I ↾ 𝐸):𝐸–1-1→𝐹))
11	10	spcegv 3294	. . . . . . 7 ⊢ (( I ↾ 𝐸) ∈ V → (( I ↾ 𝐸):𝐸–1-1→𝐹 → ∃𝑓 𝑓:𝐸–1-1→𝐹))
12	5, 9, 11	sylc 65	. . . . . 6 ⊢ ((𝐺 ∈ USGraph ∧ 𝐻 ∈ ComplUSGraph) → ∃𝑓 𝑓:𝐸–1-1→𝐹)
13	12	adantl 482	. . . . 5 ⊢ (((𝐸 ∈ Fin ∧ 𝐹 ∈ Fin) ∧ (𝐺 ∈ USGraph ∧ 𝐻 ∈ ComplUSGraph)) → ∃𝑓 𝑓:𝐸–1-1→𝐹)
14		hashdom 13168	. . . . . . 7 ⊢ ((𝐸 ∈ Fin ∧ 𝐹 ∈ Fin) → ((#‘𝐸) ≤ (#‘𝐹) ↔ 𝐸 ≼ 𝐹))
15	14	adantr 481	. . . . . 6 ⊢ (((𝐸 ∈ Fin ∧ 𝐹 ∈ Fin) ∧ (𝐺 ∈ USGraph ∧ 𝐻 ∈ ComplUSGraph)) → ((#‘𝐸) ≤ (#‘𝐹) ↔ 𝐸 ≼ 𝐹))
16		brdomg 7965	. . . . . . . 8 ⊢ (𝐹 ∈ Fin → (𝐸 ≼ 𝐹 ↔ ∃𝑓 𝑓:𝐸–1-1→𝐹))
17	16	adantl 482	. . . . . . 7 ⊢ ((𝐸 ∈ Fin ∧ 𝐹 ∈ Fin) → (𝐸 ≼ 𝐹 ↔ ∃𝑓 𝑓:𝐸–1-1→𝐹))
18	17	adantr 481	. . . . . 6 ⊢ (((𝐸 ∈ Fin ∧ 𝐹 ∈ Fin) ∧ (𝐺 ∈ USGraph ∧ 𝐻 ∈ ComplUSGraph)) → (𝐸 ≼ 𝐹 ↔ ∃𝑓 𝑓:𝐸–1-1→𝐹))
19	15, 18	bitrd 268	. . . . 5 ⊢ (((𝐸 ∈ Fin ∧ 𝐹 ∈ Fin) ∧ (𝐺 ∈ USGraph ∧ 𝐻 ∈ ComplUSGraph)) → ((#‘𝐸) ≤ (#‘𝐹) ↔ ∃𝑓 𝑓:𝐸–1-1→𝐹))
20	13, 19	mpbird 247	. . . 4 ⊢ (((𝐸 ∈ Fin ∧ 𝐹 ∈ Fin) ∧ (𝐺 ∈ USGraph ∧ 𝐻 ∈ ComplUSGraph)) → (#‘𝐸) ≤ (#‘𝐹))
21	20	exp31 630	. . 3 ⊢ (𝐸 ∈ Fin → (𝐹 ∈ Fin → ((𝐺 ∈ USGraph ∧ 𝐻 ∈ ComplUSGraph) → (#‘𝐸) ≤ (#‘𝐹))))
22	6, 1, 7, 8	sizusglecusglem2 26358	. . . . . 6 ⊢ ((𝐺 ∈ USGraph ∧ 𝐻 ∈ ComplUSGraph ∧ 𝐹 ∈ Fin) → 𝐸 ∈ Fin)
23	22	pm2.24d 147	. . . . 5 ⊢ ((𝐺 ∈ USGraph ∧ 𝐻 ∈ ComplUSGraph ∧ 𝐹 ∈ Fin) → (¬ 𝐸 ∈ Fin → (#‘𝐸) ≤ (#‘𝐹)))
24	23	3expia 1267	. . . 4 ⊢ ((𝐺 ∈ USGraph ∧ 𝐻 ∈ ComplUSGraph) → (𝐹 ∈ Fin → (¬ 𝐸 ∈ Fin → (#‘𝐸) ≤ (#‘𝐹))))
25	24	com13 88	. . 3 ⊢ (¬ 𝐸 ∈ Fin → (𝐹 ∈ Fin → ((𝐺 ∈ USGraph ∧ 𝐻 ∈ ComplUSGraph) → (#‘𝐸) ≤ (#‘𝐹))))
26	21, 25	pm2.61i 176	. 2 ⊢ (𝐹 ∈ Fin → ((𝐺 ∈ USGraph ∧ 𝐻 ∈ ComplUSGraph) → (#‘𝐸) ≤ (#‘𝐹)))
27		fvex 6201	. . . . 5 ⊢ (Edg‘𝐻) ∈ V
28	8, 27	eqeltri 2697	. . . 4 ⊢ 𝐹 ∈ V
29		nfile 13150	. . . 4 ⊢ ((𝐸 ∈ V ∧ 𝐹 ∈ V ∧ ¬ 𝐹 ∈ Fin) → (#‘𝐸) ≤ (#‘𝐹))
30	3, 28, 29	mp3an12 1414	. . 3 ⊢ (¬ 𝐹 ∈ Fin → (#‘𝐸) ≤ (#‘𝐹))
31	30	a1d 25	. 2 ⊢ (¬ 𝐹 ∈ Fin → ((𝐺 ∈ USGraph ∧ 𝐻 ∈ ComplUSGraph) → (#‘𝐸) ≤ (#‘𝐹)))
32	26, 31	pm2.61i 176	1 ⊢ ((𝐺 ∈ USGraph ∧ 𝐻 ∈ ComplUSGraph) → (#‘𝐸) ≤ (#‘𝐹))

Syntax hints:  ¬ wn 3   → wi 4   ↔ wb 196   ∧ wa 384   ∧ w3a 1037   = wceq 1483  ∃wex 1704   ∈ wcel 1990  Vcvv 3200   class class class wbr 4653   I cid 5023   ↾ cres 5116  –1-1→wf1 5885  ‘cfv 5888   ≼ cdom 7953  Fincfn 7955   ≤ cle 10075  #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-vtx 25876  df-iedg 25877  df-edg 25940  df-uhgr 25953  df-upgr 25977  df-umgr 25978  df-uspgr 26045  df-usgr 26046  df-fusgr 26209  df-nbgr 26228  df-uvtxa 26230  df-cplgr 26231  df-cusgr 26232

This theorem is referenced by:  fusgrmaxsize  26360