Theorem dflidl2rng 14741

Description: Alternate (the usual textbook) definition of a (left) ideal of a non-unital ring to be a subgroup of the additive group of the ring which is closed under left-multiplication by elements of the full ring. (Contributed by AV, 21-Mar-2025.)

Hypotheses

Ref	Expression
dflidl2rng.u	|- U = (LIdeal ` R )
dflidl2rng.b	|- B = ( Base ` R )
dflidl2rng.t	|- .x. = ( .r ` R )

Assertion

Ref	Expression
dflidl2rng	|- ( ( R e. Rng /\ I e. (SubGrp ` R ) ) -> ( I e. U <-> A. x e. B A. y e. I ( x .x. y ) e. I ) )

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

Allowed substitution hints:   .x. ( x, y)

Proof of Theorem dflidl2rng

Dummy variables z j are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		simpll 527	. . . . 5 |- ( ( ( R e. Rng /\ I e. (SubGrp ` R ) ) /\ I e. U ) -> R e. Rng )
2		simpr 110	. . . . 5 |- ( ( ( R e. Rng /\ I e. (SubGrp ` R ) ) /\ I e. U ) -> I e. U )
3		eqid 2234	. . . . . . 7 |- ( 0g ` R ) = ( 0g ` R )
4	3	subg0cl 13983	. . . . . 6 |- ( I e. (SubGrp ` R ) -> ( 0g ` R ) e. I )
5	4	ad2antlr 489	. . . . 5 |- ( ( ( R e. Rng /\ I e. (SubGrp ` R ) ) /\ I e. U ) -> ( 0g ` R ) e. I )
6	1, 2, 5	3jca 1204	. . . 4 |- ( ( ( R e. Rng /\ I e. (SubGrp ` R ) ) /\ I e. U ) -> ( R e. Rng /\ I e. U /\ ( 0g ` R ) e. I ) )
7		dflidl2rng.b	. . . . 5 |- B = ( Base ` R )
8		dflidl2rng.t	. . . . 5 |- .x. = ( .r ` R )
9		dflidl2rng.u	. . . . 5 |- U = (LIdeal ` R )
10	3, 7, 8, 9	rnglidlmcl 14740	. . . 4 |- ( ( ( R e. Rng /\ I e. U /\ ( 0g ` R ) e. I ) /\ ( x e. B /\ y e. I ) ) -> ( x .x. y ) e. I )
11	6, 10	sylan 283	. . 3 |- ( ( ( ( R e. Rng /\ I e. (SubGrp ` R ) ) /\ I e. U ) /\ ( x e. B /\ y e. I ) ) -> ( x .x. y ) e. I )
12	11	ralrimivva 2626	. 2 |- ( ( ( R e. Rng /\ I e. (SubGrp ` R ) ) /\ I e. U ) -> A. x e. B A. y e. I ( x .x. y ) e. I )
13	7	subgss 13975	. . . 4 |- ( I e. (SubGrp ` R ) -> I C_ B )
14	13	ad2antlr 489	. . 3 |- ( ( ( R e. Rng /\ I e. (SubGrp ` R ) ) /\ A. x e. B A. y e. I ( x .x. y ) e. I ) -> I C_ B )
15		elex2 2832	. . . . 5 |- ( ( 0g ` R ) e. I -> E. j j e. I )
16	4, 15	syl 14	. . . 4 |- ( I e. (SubGrp ` R ) -> E. j j e. I )
17	16	ad2antlr 489	. . 3 |- ( ( ( R e. Rng /\ I e. (SubGrp ` R ) ) /\ A. x e. B A. y e. I ( x .x. y ) e. I ) -> E. j j e. I )
18		eqid 2234	. . . . . . . . 9 |- ( +g ` R ) = ( +g ` R )
19	18	subgcl 13985	. . . . . . . 8 |- ( ( I e. (SubGrp ` R ) /\ ( x .x. y ) e. I /\ z e. I ) -> ( ( x .x. y ) ( +g ` R ) z ) e. I )
20	19	ad5ant245 1263	. . . . . . 7 |- ( ( ( ( ( R e. Rng /\ I e. (SubGrp ` R ) ) /\ ( x e. B /\ y e. I ) ) /\ ( x .x. y ) e. I ) /\ z e. I ) -> ( ( x .x. y ) ( +g ` R ) z ) e. I )
21	20	ralrimiva 2617	. . . . . 6 |- ( ( ( ( R e. Rng /\ I e. (SubGrp ` R ) ) /\ ( x e. B /\ y e. I ) ) /\ ( x .x. y ) e. I ) -> A. z e. I ( ( x .x. y ) ( +g ` R ) z ) e. I )
22	21	ex 115	. . . . 5 |- ( ( ( R e. Rng /\ I e. (SubGrp ` R ) ) /\ ( x e. B /\ y e. I ) ) -> ( ( x .x. y ) e. I -> A. z e. I ( ( x .x. y ) ( +g ` R ) z ) e. I ) )
23	22	ralimdvva 2613	. . . 4 |- ( ( R e. Rng /\ I e. (SubGrp ` R ) ) -> ( A. x e. B A. y e. I ( x .x. y ) e. I -> A. x e. B A. y e. I A. z e. I ( ( x .x. y ) ( +g ` R ) z ) e. I ) )
24	23	imp 124	. . 3 |- ( ( ( R e. Rng /\ I e. (SubGrp ` R ) ) /\ A. x e. B A. y e. I ( x .x. y ) e. I ) -> A. x e. B A. y e. I A. z e. I ( ( x .x. y ) ( +g ` R ) z ) e. I )
25	9, 7, 18, 8	islidlm 14739	. . 3 |- ( I e. U <-> ( I C_ B /\ E. j j e. I /\ A. x e. B A. y e. I A. z e. I ( ( x .x. y ) ( +g ` R ) z ) e. I ) )
26	14, 17, 24, 25	syl3anbrc 1208	. 2 |- ( ( ( R e. Rng /\ I e. (SubGrp ` R ) ) /\ A. x e. B A. y e. I ( x .x. y ) e. I ) -> I e. U )
27	12, 26	impbida 600	1 |- ( ( R e. Rng /\ I e. (SubGrp ` R ) ) -> ( I e. U <-> A. x e. B A. y e. I ( x .x. y ) e. I ) )

Syntax hints:   -> wi 4   /\ wa 104   <-> wb 105   /\ w3a 1005   = wceq 1398   E.wex 1541   e. wcel 2205   A.wral 2522   C_ wss 3214   ` cfv 5357  (class class class)co 6058   Basecbs 13296   +g cplusg 13374   .rcmulr 13375   0gc0g 13553  SubGrpcsubg 13968  Rngcrng 14160  LIdealclidl 14727

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 619  ax-in2 620  ax-io 717  ax-5 1496  ax-7 1497  ax-gen 1498  ax-ie1 1542  ax-ie2 1543  ax-8 1553  ax-10 1554  ax-11 1555  ax-i12 1556  ax-bndl 1558  ax-4 1559  ax-17 1575  ax-i9 1579  ax-ial 1583  ax-i5r 1584  ax-13 2207  ax-14 2208  ax-ext 2216  ax-coll 4230  ax-sep 4233  ax-pow 4292  ax-pr 4327  ax-un 4559  ax-setind 4664  ax-cnex 8234  ax-resscn 8235  ax-1cn 8236  ax-1re 8237  ax-icn 8238  ax-addcl 8239  ax-addrcl 8240  ax-mulcl 8241  ax-addcom 8243  ax-addass 8245  ax-i2m1 8248  ax-0lt1 8249  ax-0id 8251  ax-rnegex 8252  ax-pre-ltirr 8255  ax-pre-lttrn 8257  ax-pre-ltadd 8259

This theorem depends on definitions:  df-bi 117  df-3an 1007  df-tru 1401  df-fal 1404  df-nf 1510  df-sb 1812  df-eu 2085  df-mo 2086  df-clab 2221  df-cleq 2227  df-clel 2230  df-nfc 2375  df-ne 2415  df-nel 2510  df-ral 2527  df-rex 2528  df-reu 2529  df-rmo 2530  df-rab 2531  df-v 2817  df-sbc 3046  df-csb 3142  df-dif 3216  df-un 3218  df-in 3220  df-ss 3227  df-nul 3513  df-pw 3676  df-sn 3700  df-pr 3701  df-op 3703  df-uni 3920  df-int 3955  df-iun 3998  df-br 4115  df-opab 4177  df-mpt 4178  df-id 4419  df-xp 4760  df-rel 4761  df-cnv 4762  df-co 4763  df-dm 4764  df-rn 4765  df-res 4766  df-ima 4767  df-iota 5317  df-fun 5359  df-fn 5360  df-f 5361  df-f1 5362  df-fo 5363  df-f1o 5364  df-fv 5365  df-riota 6011  df-ov 6061  df-oprab 6062  df-mpo 6063  df-pnf 8326  df-mnf 8327  df-ltxr 8329  df-inn 9255  df-2 9313  df-3 9314  df-4 9315  df-5 9316  df-6 9317  df-7 9318  df-8 9319  df-ndx 13299  df-slot 13300  df-base 13302  df-sets 13303  df-iress 13304  df-plusg 13387  df-mulr 13388  df-sca 13390  df-vsca 13391  df-ip 13392  df-0g 13555  df-mgm 13653  df-sgrp 13699  df-mnd 13714  df-grp 13800  df-subg 13971  df-abl 14088  df-mgp 14149  df-rng 14161  df-lssm 14613  df-sra 14695  df-rgmod 14696  df-lidl 14729

This theorem is referenced by:  isridlrng  14742  dflidl2  14748  df2idl2rng  14768