Theorem sizusglecusg 40679

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 6113	. . . . . . . . 9 ⊢ (Edg‘𝐺) ∈ V
3	1, 2	eqeltri 2684	. . . . . . . 8 ⊢ 𝐸 ∈ V
4		resiexg 6994	. . . . . . . 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 40677	. . . . . . 7 ⊢ ((𝐺 ∈ USGraph ∧ 𝐻 ∈ ComplUSGraph) → ( I ↾ 𝐸):𝐸–1-1→𝐹)
10		f1eq1 6009	. . . . . . . 8 ⊢ (𝑓 = ( I ↾ 𝐸) → (𝑓:𝐸–1-1→𝐹 ↔ ( I ↾ 𝐸):𝐸–1-1→𝐹))
11	10	spcegv 3267	. . . . . . 7 ⊢ (( I ↾ 𝐸) ∈ V → (( I ↾ 𝐸):𝐸–1-1→𝐹 → ∃𝑓 𝑓:𝐸–1-1→𝐹))
12	5, 9, 11	sylc 63	. . . . . 6 ⊢ ((𝐺 ∈ USGraph ∧ 𝐻 ∈ ComplUSGraph) → ∃𝑓 𝑓:𝐸–1-1→𝐹)
13	12	adantl 481	. . . . 5 ⊢ (((𝐸 ∈ Fin ∧ 𝐹 ∈ Fin) ∧ (𝐺 ∈ USGraph ∧ 𝐻 ∈ ComplUSGraph)) → ∃𝑓 𝑓:𝐸–1-1→𝐹)
14		hashdom 13029	. . . . . . 7 ⊢ ((𝐸 ∈ Fin ∧ 𝐹 ∈ Fin) → ((#‘𝐸) ≤ (#‘𝐹) ↔ 𝐸 ≼ 𝐹))
15	14	adantr 480	. . . . . 6 ⊢ (((𝐸 ∈ Fin ∧ 𝐹 ∈ Fin) ∧ (𝐺 ∈ USGraph ∧ 𝐻 ∈ ComplUSGraph)) → ((#‘𝐸) ≤ (#‘𝐹) ↔ 𝐸 ≼ 𝐹))
16		brdomg 7851	. . . . . . . 8 ⊢ (𝐹 ∈ Fin → (𝐸 ≼ 𝐹 ↔ ∃𝑓 𝑓:𝐸–1-1→𝐹))
17	16	adantl 481	. . . . . . 7 ⊢ ((𝐸 ∈ Fin ∧ 𝐹 ∈ Fin) → (𝐸 ≼ 𝐹 ↔ ∃𝑓 𝑓:𝐸–1-1→𝐹))
18	17	adantr 480	. . . . . 6 ⊢ (((𝐸 ∈ Fin ∧ 𝐹 ∈ Fin) ∧ (𝐺 ∈ USGraph ∧ 𝐻 ∈ ComplUSGraph)) → (𝐸 ≼ 𝐹 ↔ ∃𝑓 𝑓:𝐸–1-1→𝐹))
19	15, 18	bitrd 267	. . . . 5 ⊢ (((𝐸 ∈ Fin ∧ 𝐹 ∈ Fin) ∧ (𝐺 ∈ USGraph ∧ 𝐻 ∈ ComplUSGraph)) → ((#‘𝐸) ≤ (#‘𝐹) ↔ ∃𝑓 𝑓:𝐸–1-1→𝐹))
20	13, 19	mpbird 246	. . . 4 ⊢ (((𝐸 ∈ Fin ∧ 𝐹 ∈ Fin) ∧ (𝐺 ∈ USGraph ∧ 𝐻 ∈ ComplUSGraph)) → (#‘𝐸) ≤ (#‘𝐹))
21	20	exp31 628	. . 3 ⊢ (𝐸 ∈ Fin → (𝐹 ∈ Fin → ((𝐺 ∈ USGraph ∧ 𝐻 ∈ ComplUSGraph) → (#‘𝐸) ≤ (#‘𝐹))))
22	6, 1, 7, 8	sizusglecusglem2 40678	. . . . . 6 ⊢ ((𝐺 ∈ USGraph ∧ 𝐻 ∈ ComplUSGraph ∧ 𝐹 ∈ Fin) → 𝐸 ∈ Fin)
23	22	pm2.24d 146	. . . . 5 ⊢ ((𝐺 ∈ USGraph ∧ 𝐻 ∈ ComplUSGraph ∧ 𝐹 ∈ Fin) → (¬ 𝐸 ∈ Fin → (#‘𝐸) ≤ (#‘𝐹)))
24	23	3expia 1259	. . . 4 ⊢ ((𝐺 ∈ USGraph ∧ 𝐻 ∈ ComplUSGraph) → (𝐹 ∈ Fin → (¬ 𝐸 ∈ Fin → (#‘𝐸) ≤ (#‘𝐹))))
25	24	com13 86	. . 3 ⊢ (¬ 𝐸 ∈ Fin → (𝐹 ∈ Fin → ((𝐺 ∈ USGraph ∧ 𝐻 ∈ ComplUSGraph) → (#‘𝐸) ≤ (#‘𝐹))))
26	21, 25	pm2.61i 175	. 2 ⊢ (𝐹 ∈ Fin → ((𝐺 ∈ USGraph ∧ 𝐻 ∈ ComplUSGraph) → (#‘𝐸) ≤ (#‘𝐹)))
27		fvex 6113	. . . . 5 ⊢ (Edg‘𝐻) ∈ V
28	8, 27	eqeltri 2684	. . . 4 ⊢ 𝐹 ∈ V
29		nfile 40369	. . . 4 ⊢ ((𝐸 ∈ V ∧ 𝐹 ∈ V ∧ ¬ 𝐹 ∈ Fin) → (#‘𝐸) ≤ (#‘𝐹))
30	3, 28, 29	mp3an12 1406	. . 3 ⊢ (¬ 𝐹 ∈ Fin → (#‘𝐸) ≤ (#‘𝐹))
31	30	a1d 25	. 2 ⊢ (¬ 𝐹 ∈ Fin → ((𝐺 ∈ USGraph ∧ 𝐻 ∈ ComplUSGraph) → (#‘𝐸) ≤ (#‘𝐹)))
32	26, 31	pm2.61i 175	1 ⊢ ((𝐺 ∈ USGraph ∧ 𝐻 ∈ ComplUSGraph) → (#‘𝐸) ≤ (#‘𝐹))

Syntax hints:  ¬ wn 3   → wi 4   ↔ wb 195   ∧ wa 383   ∧ w3a 1031   = wceq 1475  ∃wex 1695   ∈ wcel 1977  Vcvv 3173   class class class wbr 4583   I cid 4948   ↾ cres 5040  –1-1→wf1 5801  ‘cfv 5804   ≼ cdom 7839  Fincfn 7841   ≤ cle 9954  #chash 12979  Vtxcvtx 25673  Edgcedga 25792   USGraph cusgr 40379  ComplUSGraphccusgr 40553

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1713  ax-4 1728  ax-5 1827  ax-6 1875  ax-7 1922  ax-8 1979  ax-9 1986  ax-10 2006  ax-11 2021  ax-12 2034  ax-13 2234  ax-ext 2590  ax-rep 4699  ax-sep 4709  ax-nul 4717  ax-pow 4769  ax-pr 4833  ax-un 6847  ax-cnex 9871  ax-resscn 9872  ax-1cn 9873  ax-icn 9874  ax-addcl 9875  ax-addrcl 9876  ax-mulcl 9877  ax-mulrcl 9878  ax-mulcom 9879  ax-addass 9880  ax-mulass 9881  ax-distr 9882  ax-i2m1 9883  ax-1ne0 9884  ax-1rid 9885  ax-rnegex 9886  ax-rrecex 9887  ax-cnre 9888  ax-pre-lttri 9889  ax-pre-lttrn 9890  ax-pre-ltadd 9891  ax-pre-mulgt0 9892

This theorem depends on definitions:  df-bi 196  df-or 384  df-an 385  df-3or 1032  df-3an 1033  df-tru 1478  df-fal 1481  df-ex 1696  df-nf 1701  df-sb 1868  df-eu 2462  df-mo 2463  df-clab 2597  df-cleq 2603  df-clel 2606  df-nfc 2740  df-ne 2782  df-nel 2783  df-ral 2901  df-rex 2902  df-reu 2903  df-rmo 2904  df-rab 2905  df-v 3175  df-sbc 3403  df-csb 3500  df-dif 3543  df-un 3545  df-in 3547  df-ss 3554  df-pss 3556  df-nul 3875  df-if 4037  df-pw 4110  df-sn 4126  df-pr 4128  df-tp 4130  df-op 4132  df-uni 4373  df-int 4411  df-iun 4457  df-br 4584  df-opab 4644  df-mpt 4645  df-tr 4681  df-eprel 4949  df-id 4953  df-po 4959  df-so 4960  df-fr 4997  df-we 4999  df-xp 5044  df-rel 5045  df-cnv 5046  df-co 5047  df-dm 5048  df-rn 5049  df-res 5050  df-ima 5051  df-pred 5597  df-ord 5643  df-on 5644  df-lim 5645  df-suc 5646  df-iota 5768  df-fun 5806  df-fn 5807  df-f 5808  df-f1 5809  df-fo 5810  df-f1o 5811  df-fv 5812  df-riota 6511  df-ov 6552  df-oprab 6553  df-mpt2 6554  df-om 6958  df-1st 7059  df-2nd 7060  df-wrecs 7294  df-recs 7355  df-rdg 7393  df-1o 7447  df-2o 7448  df-oadd 7451  df-er 7629  df-en 7842  df-dom 7843  df-sdom 7844  df-fin 7845  df-card 8648  df-cda 8873  df-pnf 9955  df-mnf 9956  df-xr 9957  df-ltxr 9958  df-le 9959  df-sub 10147  df-neg 10148  df-nn 10898  df-2 10956  df-n0 11170  df-xnn0 11241  df-z 11255  df-uz 11564  df-fz 12198  df-hash 12980  df-vtx 25675  df-iedg 25676  df-uhgr 25724  df-upgr 25749  df-umgr 25750  df-edga 25793  df-uspgr 40380  df-usgr 40381  df-fusgr 40536  df-nbgr 40554  df-uvtxa 40556  df-cplgr 40557  df-cusgr 40558

This theorem is referenced by:  fusgrmaxsize  40680