Theorem primefld 20690

Description: The smallest sub division ring of a division ring, here named 𝑃, is a field, called the Prime Field of 𝑅. (Suggested by GL, 4-Aug-2023.) (Contributed by Thierry Arnoux, 21-Aug-2023.)

Hypothesis

Ref	Expression
primefld.1	⊢ 𝑃 = (𝑅 ↾s ∩ (SubDRing‘𝑅))

Assertion

Ref	Expression
primefld	⊢ (𝑅 ∈ DivRing → 𝑃 ∈ Field)

Proof of Theorem primefld

Dummy variables 𝑠 𝑥 𝑦 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		primefld.1	. . 3 ⊢ 𝑃 = (𝑅 ↾s ∩ (SubDRing‘𝑅))
2		id 22	. . 3 ⊢ (𝑅 ∈ DivRing → 𝑅 ∈ DivRing)
3		issdrg 20673	. . . . . 6 ⊢ (𝑠 ∈ (SubDRing‘𝑅) ↔ (𝑅 ∈ DivRing ∧ 𝑠 ∈ (SubRing‘𝑅) ∧ (𝑅 ↾s 𝑠) ∈ DivRing))
4	3	simp2bi 1146	. . . . 5 ⊢ (𝑠 ∈ (SubDRing‘𝑅) → 𝑠 ∈ (SubRing‘𝑅))
5	4	ssriv 3939	. . . 4 ⊢ (SubDRing‘𝑅) ⊆ (SubRing‘𝑅)
6	5	a1i 11	. . 3 ⊢ (𝑅 ∈ DivRing → (SubDRing‘𝑅) ⊆ (SubRing‘𝑅))
7		eqid 2729	. . . . 5 ⊢ (Base‘𝑅) = (Base‘𝑅)
8	7	sdrgid 20677	. . . 4 ⊢ (𝑅 ∈ DivRing → (Base‘𝑅) ∈ (SubDRing‘𝑅))
9	8	ne0d 4293	. . 3 ⊢ (𝑅 ∈ DivRing → (SubDRing‘𝑅) ≠ ∅)
10	3	simp3bi 1147	. . . 4 ⊢ (𝑠 ∈ (SubDRing‘𝑅) → (𝑅 ↾s 𝑠) ∈ DivRing)
11	10	adantl 481	. . 3 ⊢ ((𝑅 ∈ DivRing ∧ 𝑠 ∈ (SubDRing‘𝑅)) → (𝑅 ↾s 𝑠) ∈ DivRing)
12	1, 2, 6, 9, 11	subdrgint 20688	. 2 ⊢ (𝑅 ∈ DivRing → 𝑃 ∈ DivRing)
13		drngring 20621	. . . 4 ⊢ (𝑃 ∈ DivRing → 𝑃 ∈ Ring)
14	12, 13	syl 17	. . 3 ⊢ (𝑅 ∈ DivRing → 𝑃 ∈ Ring)
15		ssidd 3959	. . . . . . . . . . . . . 14 ⊢ (𝑅 ∈ DivRing → (Base‘𝑅) ⊆ (Base‘𝑅))
16		eqid 2729	. . . . . . . . . . . . . . 15 ⊢ (mulGrp‘𝑅) = (mulGrp‘𝑅)
17		eqid 2729	. . . . . . . . . . . . . . 15 ⊢ (Cntz‘(mulGrp‘𝑅)) = (Cntz‘(mulGrp‘𝑅))
18	7, 16, 17	cntzsdrg 20687	. . . . . . . . . . . . . 14 ⊢ ((𝑅 ∈ DivRing ∧ (Base‘𝑅) ⊆ (Base‘𝑅)) → ((Cntz‘(mulGrp‘𝑅))‘(Base‘𝑅)) ∈ (SubDRing‘𝑅))
19	2, 15, 18	syl2anc 584	. . . . . . . . . . . . 13 ⊢ (𝑅 ∈ DivRing → ((Cntz‘(mulGrp‘𝑅))‘(Base‘𝑅)) ∈ (SubDRing‘𝑅))
20		intss1 4913	. . . . . . . . . . . . 13 ⊢ (((Cntz‘(mulGrp‘𝑅))‘(Base‘𝑅)) ∈ (SubDRing‘𝑅) → ∩ (SubDRing‘𝑅) ⊆ ((Cntz‘(mulGrp‘𝑅))‘(Base‘𝑅)))
21	19, 20	syl 17	. . . . . . . . . . . 12 ⊢ (𝑅 ∈ DivRing → ∩ (SubDRing‘𝑅) ⊆ ((Cntz‘(mulGrp‘𝑅))‘(Base‘𝑅)))
22	16, 7	mgpbas 20030	. . . . . . . . . . . . 13 ⊢ (Base‘𝑅) = (Base‘(mulGrp‘𝑅))
23	22, 17	cntrval 19198	. . . . . . . . . . . 12 ⊢ ((Cntz‘(mulGrp‘𝑅))‘(Base‘𝑅)) = (Cntr‘(mulGrp‘𝑅))
24	21, 23	sseqtrdi 3976	. . . . . . . . . . 11 ⊢ (𝑅 ∈ DivRing → ∩ (SubDRing‘𝑅) ⊆ (Cntr‘(mulGrp‘𝑅)))
25	22	cntrss 19210	. . . . . . . . . . 11 ⊢ (Cntr‘(mulGrp‘𝑅)) ⊆ (Base‘𝑅)
26	24, 25	sstrdi 3948	. . . . . . . . . 10 ⊢ (𝑅 ∈ DivRing → ∩ (SubDRing‘𝑅) ⊆ (Base‘𝑅))
27	1, 7	ressbas2 17149	. . . . . . . . . 10 ⊢ (∩ (SubDRing‘𝑅) ⊆ (Base‘𝑅) → ∩ (SubDRing‘𝑅) = (Base‘𝑃))
28	26, 27	syl 17	. . . . . . . . 9 ⊢ (𝑅 ∈ DivRing → ∩ (SubDRing‘𝑅) = (Base‘𝑃))
29	28, 24	eqsstrrd 3971	. . . . . . . 8 ⊢ (𝑅 ∈ DivRing → (Base‘𝑃) ⊆ (Cntr‘(mulGrp‘𝑅)))
30	29	adantr 480	. . . . . . 7 ⊢ ((𝑅 ∈ DivRing ∧ (𝑥 ∈ (Base‘𝑃) ∧ 𝑦 ∈ (Base‘𝑃))) → (Base‘𝑃) ⊆ (Cntr‘(mulGrp‘𝑅)))
31		simprl 770	. . . . . . 7 ⊢ ((𝑅 ∈ DivRing ∧ (𝑥 ∈ (Base‘𝑃) ∧ 𝑦 ∈ (Base‘𝑃))) → 𝑥 ∈ (Base‘𝑃))
32	30, 31	sseldd 3936	. . . . . 6 ⊢ ((𝑅 ∈ DivRing ∧ (𝑥 ∈ (Base‘𝑃) ∧ 𝑦 ∈ (Base‘𝑃))) → 𝑥 ∈ (Cntr‘(mulGrp‘𝑅)))
33	28, 26	eqsstrrd 3971	. . . . . . . 8 ⊢ (𝑅 ∈ DivRing → (Base‘𝑃) ⊆ (Base‘𝑅))
34	33	adantr 480	. . . . . . 7 ⊢ ((𝑅 ∈ DivRing ∧ (𝑥 ∈ (Base‘𝑃) ∧ 𝑦 ∈ (Base‘𝑃))) → (Base‘𝑃) ⊆ (Base‘𝑅))
35		simprr 772	. . . . . . 7 ⊢ ((𝑅 ∈ DivRing ∧ (𝑥 ∈ (Base‘𝑃) ∧ 𝑦 ∈ (Base‘𝑃))) → 𝑦 ∈ (Base‘𝑃))
36	34, 35	sseldd 3936	. . . . . 6 ⊢ ((𝑅 ∈ DivRing ∧ (𝑥 ∈ (Base‘𝑃) ∧ 𝑦 ∈ (Base‘𝑃))) → 𝑦 ∈ (Base‘𝑅))
37		eqid 2729	. . . . . . . 8 ⊢ (.r‘𝑅) = (.r‘𝑅)
38	16, 37	mgpplusg 20029	. . . . . . 7 ⊢ (.r‘𝑅) = (+g‘(mulGrp‘𝑅))
39		eqid 2729	. . . . . . 7 ⊢ (Cntr‘(mulGrp‘𝑅)) = (Cntr‘(mulGrp‘𝑅))
40	22, 38, 39	cntri 19211	. . . . . 6 ⊢ ((𝑥 ∈ (Cntr‘(mulGrp‘𝑅)) ∧ 𝑦 ∈ (Base‘𝑅)) → (𝑥(.r‘𝑅)𝑦) = (𝑦(.r‘𝑅)𝑥))
41	32, 36, 40	syl2anc 584	. . . . 5 ⊢ ((𝑅 ∈ DivRing ∧ (𝑥 ∈ (Base‘𝑃) ∧ 𝑦 ∈ (Base‘𝑃))) → (𝑥(.r‘𝑅)𝑦) = (𝑦(.r‘𝑅)𝑥))
42	8, 26	ssexd 5263	. . . . . . 7 ⊢ (𝑅 ∈ DivRing → ∩ (SubDRing‘𝑅) ∈ V)
43	1, 37	ressmulr 17211	. . . . . . 7 ⊢ (∩ (SubDRing‘𝑅) ∈ V → (.r‘𝑅) = (.r‘𝑃))
44	42, 43	syl 17	. . . . . 6 ⊢ (𝑅 ∈ DivRing → (.r‘𝑅) = (.r‘𝑃))
45	44	oveqdr 7377	. . . . 5 ⊢ ((𝑅 ∈ DivRing ∧ (𝑥 ∈ (Base‘𝑃) ∧ 𝑦 ∈ (Base‘𝑃))) → (𝑥(.r‘𝑅)𝑦) = (𝑥(.r‘𝑃)𝑦))
46	44	oveqdr 7377	. . . . 5 ⊢ ((𝑅 ∈ DivRing ∧ (𝑥 ∈ (Base‘𝑃) ∧ 𝑦 ∈ (Base‘𝑃))) → (𝑦(.r‘𝑅)𝑥) = (𝑦(.r‘𝑃)𝑥))
47	41, 45, 46	3eqtr3d 2772	. . . 4 ⊢ ((𝑅 ∈ DivRing ∧ (𝑥 ∈ (Base‘𝑃) ∧ 𝑦 ∈ (Base‘𝑃))) → (𝑥(.r‘𝑃)𝑦) = (𝑦(.r‘𝑃)𝑥))
48	47	ralrimivva 3172	. . 3 ⊢ (𝑅 ∈ DivRing → ∀𝑥 ∈ (Base‘𝑃)∀𝑦 ∈ (Base‘𝑃)(𝑥(.r‘𝑃)𝑦) = (𝑦(.r‘𝑃)𝑥))
49		eqid 2729	. . . 4 ⊢ (Base‘𝑃) = (Base‘𝑃)
50		eqid 2729	. . . 4 ⊢ (.r‘𝑃) = (.r‘𝑃)
51	49, 50	iscrng2 20137	. . 3 ⊢ (𝑃 ∈ CRing ↔ (𝑃 ∈ Ring ∧ ∀𝑥 ∈ (Base‘𝑃)∀𝑦 ∈ (Base‘𝑃)(𝑥(.r‘𝑃)𝑦) = (𝑦(.r‘𝑃)𝑥)))
52	14, 48, 51	sylanbrc 583	. 2 ⊢ (𝑅 ∈ DivRing → 𝑃 ∈ CRing)
53		isfld 20625	. 2 ⊢ (𝑃 ∈ Field ↔ (𝑃 ∈ DivRing ∧ 𝑃 ∈ CRing))
54	12, 52, 53	sylanbrc 583	1 ⊢ (𝑅 ∈ DivRing → 𝑃 ∈ Field)

Syntax hints:   → wi 4   ∧ wa 395   = wceq 1540   ∈ wcel 2109  ∀wral 3044  Vcvv 3436   ⊆ wss 3903  ∩ cint 4896  ‘cfv 6482  (class class class)co 7349  Basecbs 17120   ↾_s cress 17141  ._rcmulr 17162  Cntzccntz 19194  Cntrccntr 19195  mulGrpcmgp 20025  Ringcrg 20118  CRingccrg 20119  SubRingcsubrg 20454  DivRingcdr 20614  Fieldcfield 20615  SubDRingcsdrg 20671

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1795  ax-4 1809  ax-5 1910  ax-6 1967  ax-7 2008  ax-8 2111  ax-9 2119  ax-10 2142  ax-11 2158  ax-12 2178  ax-ext 2701  ax-rep 5218  ax-sep 5235  ax-nul 5245  ax-pow 5304  ax-pr 5371  ax-un 7671  ax-cnex 11065  ax-resscn 11066  ax-1cn 11067  ax-icn 11068  ax-addcl 11069  ax-addrcl 11070  ax-mulcl 11071  ax-mulrcl 11072  ax-mulcom 11073  ax-addass 11074  ax-mulass 11075  ax-distr 11076  ax-i2m1 11077  ax-1ne0 11078  ax-1rid 11079  ax-rnegex 11080  ax-rrecex 11081  ax-cnre 11082  ax-pre-lttri 11083  ax-pre-lttrn 11084  ax-pre-ltadd 11085  ax-pre-mulgt0 11086

This theorem depends on definitions:  df-bi 207  df-an 396  df-or 848  df-3or 1087  df-3an 1088  df-tru 1543  df-fal 1553  df-ex 1780  df-nf 1784  df-sb 2066  df-mo 2533  df-eu 2562  df-clab 2708  df-cleq 2721  df-clel 2803  df-nfc 2878  df-ne 2926  df-nel 3030  df-ral 3045  df-rex 3054  df-rmo 3343  df-reu 3344  df-rab 3395  df-v 3438  df-sbc 3743  df-csb 3852  df-dif 3906  df-un 3908  df-in 3910  df-ss 3920  df-pss 3923  df-nul 4285  df-if 4477  df-pw 4553  df-sn 4578  df-pr 4580  df-op 4584  df-uni 4859  df-int 4897  df-iun 4943  df-iin 4944  df-br 5093  df-opab 5155  df-mpt 5174  df-tr 5200  df-id 5514  df-eprel 5519  df-po 5527  df-so 5528  df-fr 5572  df-we 5574  df-xp 5625  df-rel 5626  df-cnv 5627  df-co 5628  df-dm 5629  df-rn 5630  df-res 5631  df-ima 5632  df-pred 6249  df-ord 6310  df-on 6311  df-lim 6312  df-suc 6313  df-iota 6438  df-fun 6484  df-fn 6485  df-f 6486  df-f1 6487  df-fo 6488  df-f1o 6489  df-fv 6490  df-riota 7306  df-ov 7352  df-oprab 7353  df-mpo 7354  df-om 7800  df-1st 7924  df-2nd 7925  df-tpos 8159  df-frecs 8214  df-wrecs 8245  df-recs 8294  df-rdg 8332  df-er 8625  df-en 8873  df-dom 8874  df-sdom 8875  df-pnf 11151  df-mnf 11152  df-xr 11153  df-ltxr 11154  df-le 11155  df-sub 11349  df-neg 11350  df-nn 12129  df-2 12191  df-3 12192  df-sets 17075  df-slot 17093  df-ndx 17105  df-base 17121  df-ress 17142  df-plusg 17174  df-mulr 17175  df-0g 17345  df-mgm 18514  df-sgrp 18593  df-mnd 18609  df-submnd 18658  df-grp 18815  df-minusg 18816  df-subg 19002  df-cntz 19196  df-cntr 19197  df-cmn 19661  df-abl 19662  df-mgp 20026  df-rng 20038  df-ur 20067  df-ring 20120  df-cring 20121  df-oppr 20222  df-dvdsr 20242  df-unit 20243  df-invr 20273  df-dvr 20286  df-subrng 20431  df-subrg 20455  df-drng 20616  df-field 20617  df-sdrg 20672

This theorem is referenced by: (None)