Theorem isridl 14433

Description: A right ideal is a left ideal of the opposite ring. This theorem shows that this definition corresponds to the usual textbook definition of a right ideal of a ring to be a subgroup of the additive group of the ring which is closed under right-multiplication by elements of the full ring. (Contributed by AV, 13-Feb-2025.)

Hypotheses

Ref	Expression
isridl.u	⊢ 𝑈 = (LIdeal‘(oppr‘𝑅))
isridl.b	⊢ 𝐵 = (Base‘𝑅)
isridl.t	⊢ · = (.r‘𝑅)

Assertion

Ref	Expression
isridl	⊢ (𝑅 ∈ Ring → (𝐼 ∈ 𝑈 ↔ (𝐼 ∈ (SubGrp‘𝑅) ∧ ∀𝑥 ∈ 𝐵 ∀𝑦 ∈ 𝐼 (𝑦 · 𝑥) ∈ 𝐼)))

Distinct variable groups:   𝑥,𝐵,𝑦   𝑥,𝐼,𝑦   𝑥,𝑅,𝑦   𝑥,𝑈,𝑦

Allowed substitution hints:   · (𝑥,𝑦)

Proof of Theorem isridl

Step	Hyp	Ref	Expression
1		eqid 2209	. . . 4 ⊢ (oppr‘𝑅) = (oppr‘𝑅)
2	1	opprring 14008	. . 3 ⊢ (𝑅 ∈ Ring → (oppr‘𝑅) ∈ Ring)
3		isridl.u	. . . 4 ⊢ 𝑈 = (LIdeal‘(oppr‘𝑅))
4		eqid 2209	. . . 4 ⊢ (Base‘(oppr‘𝑅)) = (Base‘(oppr‘𝑅))
5		eqid 2209	. . . 4 ⊢ (.r‘(oppr‘𝑅)) = (.r‘(oppr‘𝑅))
6	3, 4, 5	dflidl2 14417	. . 3 ⊢ ((oppr‘𝑅) ∈ Ring → (𝐼 ∈ 𝑈 ↔ (𝐼 ∈ (SubGrp‘(oppr‘𝑅)) ∧ ∀𝑥 ∈ (Base‘(oppr‘𝑅))∀𝑦 ∈ 𝐼 (𝑥(.r‘(oppr‘𝑅))𝑦) ∈ 𝐼)))
7	2, 6	syl 14	. 2 ⊢ (𝑅 ∈ Ring → (𝐼 ∈ 𝑈 ↔ (𝐼 ∈ (SubGrp‘(oppr‘𝑅)) ∧ ∀𝑥 ∈ (Base‘(oppr‘𝑅))∀𝑦 ∈ 𝐼 (𝑥(.r‘(oppr‘𝑅))𝑦) ∈ 𝐼)))
8	1	opprsubgg 14013	. . . . 5 ⊢ (𝑅 ∈ Ring → (SubGrp‘𝑅) = (SubGrp‘(oppr‘𝑅)))
9	8	eqcomd 2215	. . . 4 ⊢ (𝑅 ∈ Ring → (SubGrp‘(oppr‘𝑅)) = (SubGrp‘𝑅))
10	9	eleq2d 2279	. . 3 ⊢ (𝑅 ∈ Ring → (𝐼 ∈ (SubGrp‘(oppr‘𝑅)) ↔ 𝐼 ∈ (SubGrp‘𝑅)))
11		isridl.b	. . . . . 6 ⊢ 𝐵 = (Base‘𝑅)
12	1, 11	opprbasg 14004	. . . . 5 ⊢ (𝑅 ∈ Ring → 𝐵 = (Base‘(oppr‘𝑅)))
13	12	eqcomd 2215	. . . 4 ⊢ (𝑅 ∈ Ring → (Base‘(oppr‘𝑅)) = 𝐵)
14	12	eleq2d 2279	. . . . . 6 ⊢ (𝑅 ∈ Ring → (𝑥 ∈ 𝐵 ↔ 𝑥 ∈ (Base‘(oppr‘𝑅))))
15	14	pm5.32i 454	. . . . 5 ⊢ ((𝑅 ∈ Ring ∧ 𝑥 ∈ 𝐵) ↔ (𝑅 ∈ Ring ∧ 𝑥 ∈ (Base‘(oppr‘𝑅))))
16		vex 2782	. . . . . . . . 9 ⊢ 𝑥 ∈ V
17		vex 2782	. . . . . . . . 9 ⊢ 𝑦 ∈ V
18		isridl.t	. . . . . . . . . 10 ⊢ · = (.r‘𝑅)
19	11, 18, 1, 5	opprmulg 14000	. . . . . . . . 9 ⊢ ((𝑅 ∈ Ring ∧ 𝑥 ∈ V ∧ 𝑦 ∈ V) → (𝑥(.r‘(oppr‘𝑅))𝑦) = (𝑦 · 𝑥))
20	16, 17, 19	mp3an23 1344	. . . . . . . 8 ⊢ (𝑅 ∈ Ring → (𝑥(.r‘(oppr‘𝑅))𝑦) = (𝑦 · 𝑥))
21	20	eleq1d 2278	. . . . . . 7 ⊢ (𝑅 ∈ Ring → ((𝑥(.r‘(oppr‘𝑅))𝑦) ∈ 𝐼 ↔ (𝑦 · 𝑥) ∈ 𝐼))
22	21	ad2antrr 488	. . . . . 6 ⊢ (((𝑅 ∈ Ring ∧ 𝑥 ∈ 𝐵) ∧ 𝑦 ∈ 𝐼) → ((𝑥(.r‘(oppr‘𝑅))𝑦) ∈ 𝐼 ↔ (𝑦 · 𝑥) ∈ 𝐼))
23	22	ralbidva 2506	. . . . 5 ⊢ ((𝑅 ∈ Ring ∧ 𝑥 ∈ 𝐵) → (∀𝑦 ∈ 𝐼 (𝑥(.r‘(oppr‘𝑅))𝑦) ∈ 𝐼 ↔ ∀𝑦 ∈ 𝐼 (𝑦 · 𝑥) ∈ 𝐼))
24	15, 23	sylbir 135	. . . 4 ⊢ ((𝑅 ∈ Ring ∧ 𝑥 ∈ (Base‘(oppr‘𝑅))) → (∀𝑦 ∈ 𝐼 (𝑥(.r‘(oppr‘𝑅))𝑦) ∈ 𝐼 ↔ ∀𝑦 ∈ 𝐼 (𝑦 · 𝑥) ∈ 𝐼))
25	13, 24	raleqbidva 2726	. . 3 ⊢ (𝑅 ∈ Ring → (∀𝑥 ∈ (Base‘(oppr‘𝑅))∀𝑦 ∈ 𝐼 (𝑥(.r‘(oppr‘𝑅))𝑦) ∈ 𝐼 ↔ ∀𝑥 ∈ 𝐵 ∀𝑦 ∈ 𝐼 (𝑦 · 𝑥) ∈ 𝐼))
26	10, 25	anbi12d 473	. 2 ⊢ (𝑅 ∈ Ring → ((𝐼 ∈ (SubGrp‘(oppr‘𝑅)) ∧ ∀𝑥 ∈ (Base‘(oppr‘𝑅))∀𝑦 ∈ 𝐼 (𝑥(.r‘(oppr‘𝑅))𝑦) ∈ 𝐼) ↔ (𝐼 ∈ (SubGrp‘𝑅) ∧ ∀𝑥 ∈ 𝐵 ∀𝑦 ∈ 𝐼 (𝑦 · 𝑥) ∈ 𝐼)))
27	7, 26	bitrd 188	1 ⊢ (𝑅 ∈ Ring → (𝐼 ∈ 𝑈 ↔ (𝐼 ∈ (SubGrp‘𝑅) ∧ ∀𝑥 ∈ 𝐵 ∀𝑦 ∈ 𝐼 (𝑦 · 𝑥) ∈ 𝐼)))

Syntax hints:   → wi 4   ∧ wa 104   ↔ wb 105   = wceq 1375   ∈ wcel 2180  ∀wral 2488  Vcvv 2779  ‘cfv 5294  (class class class)co 5974  Basecbs 12998  ._rcmulr 13077  SubGrpcsubg 13670  Ringcrg 13925  opp_rcoppr 13996  LIdealclidl 14396

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-in1 617  ax-in2 618  ax-io 713  ax-5 1473  ax-7 1474  ax-gen 1475  ax-ie1 1519  ax-ie2 1520  ax-8 1530  ax-10 1531  ax-11 1532  ax-i12 1533  ax-bndl 1535  ax-4 1536  ax-17 1552  ax-i9 1556  ax-ial 1560  ax-i5r 1561  ax-13 2182  ax-14 2183  ax-ext 2191  ax-coll 4178  ax-sep 4181  ax-nul 4189  ax-pow 4237  ax-pr 4272  ax-un 4501  ax-setind 4606  ax-cnex 8058  ax-resscn 8059  ax-1cn 8060  ax-1re 8061  ax-icn 8062  ax-addcl 8063  ax-addrcl 8064  ax-mulcl 8065  ax-addcom 8067  ax-addass 8069  ax-i2m1 8072  ax-0lt1 8073  ax-0id 8075  ax-rnegex 8076  ax-pre-ltirr 8079  ax-pre-lttrn 8081  ax-pre-ltadd 8083

This theorem depends on definitions:  df-bi 117  df-3an 985  df-tru 1378  df-fal 1381  df-nf 1487  df-sb 1789  df-eu 2060  df-mo 2061  df-clab 2196  df-cleq 2202  df-clel 2205  df-nfc 2341  df-ne 2381  df-nel 2476  df-ral 2493  df-rex 2494  df-reu 2495  df-rmo 2496  df-rab 2497  df-v 2781  df-sbc 3009  df-csb 3105  df-dif 3179  df-un 3181  df-in 3183  df-ss 3190  df-nul 3472  df-pw 3631  df-sn 3652  df-pr 3653  df-op 3655  df-uni 3868  df-int 3903  df-iun 3946  df-br 4063  df-opab 4125  df-mpt 4126  df-id 4361  df-xp 4702  df-rel 4703  df-cnv 4704  df-co 4705  df-dm 4706  df-rn 4707  df-res 4708  df-ima 4709  df-iota 5254  df-fun 5296  df-fn 5297  df-f 5298  df-f1 5299  df-fo 5300  df-f1o 5301  df-fv 5302  df-riota 5927  df-ov 5977  df-oprab 5978  df-mpo 5979  df-1st 6256  df-2nd 6257  df-tpos 6361  df-pnf 8151  df-mnf 8152  df-ltxr 8154  df-inn 9079  df-2 9137  df-3 9138  df-4 9139  df-5 9140  df-6 9141  df-7 9142  df-8 9143  df-ndx 13001  df-slot 13002  df-base 13004  df-sets 13005  df-iress 13006  df-plusg 13089  df-mulr 13090  df-sca 13092  df-vsca 13093  df-ip 13094  df-0g 13257  df-mgm 13355  df-sgrp 13401  df-mnd 13416  df-grp 13502  df-minusg 13503  df-sbg 13504  df-subg 13673  df-cmn 13789  df-abl 13790  df-mgp 13850  df-rng 13862  df-ur 13889  df-ring 13927  df-oppr 13997  df-subrg 14148  df-lmod 14218  df-lssm 14282  df-sra 14364  df-rgmod 14365  df-lidl 14398

This theorem is referenced by: (None)