Theorem ringlghm 14289

Description: Left-multiplication in a ring by a fixed element of the ring is a group homomorphism. (It is not usually a ring homomorphism.) (Contributed by Mario Carneiro, 4-May-2015.)

Hypotheses

Ref	Expression
ringlghm.b	|- B = ( Base ` R )
ringlghm.t	|- .x. = ( .r ` R )

Assertion

Ref	Expression
ringlghm	|- ( ( R e. Ring /\ X e. B ) -> ( x e. B |-> ( X .x. x ) ) e. ( R GrpHom R ) )

Distinct variable groups:   x, B   x, R   x, .x.   x, X

Proof of Theorem ringlghm

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

Step	Hyp	Ref	Expression
1		ringlghm.b	. 2 |- B = ( Base ` R )
2		eqid 2234	. 2 |- ( +g ` R ) = ( +g ` R )
3		ringgrp 14229	. . 3 |- ( R e. Ring -> R e. Grp )
4	3	adantr 276	. 2 |- ( ( R e. Ring /\ X e. B ) -> R e. Grp )
5		ringlghm.t	. . . . 5 |- .x. = ( .r ` R )
6	1, 5	ringcl 14241	. . . 4 |- ( ( R e. Ring /\ X e. B /\ x e. B ) -> ( X .x. x ) e. B )
7	6	3expa 1230	. . 3 |- ( ( ( R e. Ring /\ X e. B ) /\ x e. B ) -> ( X .x. x ) e. B )
8	7	fmpttd 5837	. 2 |- ( ( R e. Ring /\ X e. B ) -> ( x e. B |-> ( X .x. x ) ) : B --> B )
9		3anass 1009	. . . . 5 |- ( ( X e. B /\ y e. B /\ z e. B ) <-> ( X e. B /\ ( y e. B /\ z e. B ) ) )
10	1, 2, 5	ringdi 14246	. . . . 5 |- ( ( R e. Ring /\ ( X e. B /\ y e. B /\ z e. B ) ) -> ( X .x. ( y ( +g ` R ) z ) ) = ( ( X .x. y ) ( +g ` R ) ( X .x. z ) ) )
11	9, 10	sylan2br 288	. . . 4 |- ( ( R e. Ring /\ ( X e. B /\ ( y e. B /\ z e. B ) ) ) -> ( X .x. ( y ( +g ` R ) z ) ) = ( ( X .x. y ) ( +g ` R ) ( X .x. z ) ) )
12	11	anassrs 400	. . 3 |- ( ( ( R e. Ring /\ X e. B ) /\ ( y e. B /\ z e. B ) ) -> ( X .x. ( y ( +g ` R ) z ) ) = ( ( X .x. y ) ( +g ` R ) ( X .x. z ) ) )
13		eqid 2234	. . . 4 |- ( x e. B |-> ( X .x. x ) ) = ( x e. B |-> ( X .x. x ) )
14		oveq2 6066	. . . 4 |- ( x = ( y ( +g ` R ) z ) -> ( X .x. x ) = ( X .x. ( y ( +g ` R ) z ) ) )
15	1, 2	ringacl 14258	. . . . . 6 |- ( ( R e. Ring /\ y e. B /\ z e. B ) -> ( y ( +g ` R ) z ) e. B )
16	15	3expb 1231	. . . . 5 |- ( ( R e. Ring /\ ( y e. B /\ z e. B ) ) -> ( y ( +g ` R ) z ) e. B )
17	16	adantlr 477	. . . 4 |- ( ( ( R e. Ring /\ X e. B ) /\ ( y e. B /\ z e. B ) ) -> ( y ( +g ` R ) z ) e. B )
18		simpll 527	. . . . 5 |- ( ( ( R e. Ring /\ X e. B ) /\ ( y e. B /\ z e. B ) ) -> R e. Ring )
19		simplr 529	. . . . 5 |- ( ( ( R e. Ring /\ X e. B ) /\ ( y e. B /\ z e. B ) ) -> X e. B )
20	1, 5	ringcl 14241	. . . . 5 |- ( ( R e. Ring /\ X e. B /\ ( y ( +g ` R ) z ) e. B ) -> ( X .x. ( y ( +g ` R ) z ) ) e. B )
21	18, 19, 17, 20	syl3anc 1274	. . . 4 |- ( ( ( R e. Ring /\ X e. B ) /\ ( y e. B /\ z e. B ) ) -> ( X .x. ( y ( +g ` R ) z ) ) e. B )
22	13, 14, 17, 21	fvmptd3 5776	. . 3 |- ( ( ( R e. Ring /\ X e. B ) /\ ( y e. B /\ z e. B ) ) -> ( ( x e. B |-> ( X .x. x ) ) ` ( y ( +g ` R ) z ) ) = ( X .x. ( y ( +g ` R ) z ) ) )
23		oveq2 6066	. . . . 5 |- ( x = y -> ( X .x. x ) = ( X .x. y ) )
24		simprl 531	. . . . 5 |- ( ( ( R e. Ring /\ X e. B ) /\ ( y e. B /\ z e. B ) ) -> y e. B )
25	1, 5	ringcl 14241	. . . . . 6 |- ( ( R e. Ring /\ X e. B /\ y e. B ) -> ( X .x. y ) e. B )
26	18, 19, 24, 25	syl3anc 1274	. . . . 5 |- ( ( ( R e. Ring /\ X e. B ) /\ ( y e. B /\ z e. B ) ) -> ( X .x. y ) e. B )
27	13, 23, 24, 26	fvmptd3 5776	. . . 4 |- ( ( ( R e. Ring /\ X e. B ) /\ ( y e. B /\ z e. B ) ) -> ( ( x e. B |-> ( X .x. x ) ) ` y ) = ( X .x. y ) )
28		oveq2 6066	. . . . 5 |- ( x = z -> ( X .x. x ) = ( X .x. z ) )
29		simprr 533	. . . . 5 |- ( ( ( R e. Ring /\ X e. B ) /\ ( y e. B /\ z e. B ) ) -> z e. B )
30	1, 5	ringcl 14241	. . . . . 6 |- ( ( R e. Ring /\ X e. B /\ z e. B ) -> ( X .x. z ) e. B )
31	18, 19, 29, 30	syl3anc 1274	. . . . 5 |- ( ( ( R e. Ring /\ X e. B ) /\ ( y e. B /\ z e. B ) ) -> ( X .x. z ) e. B )
32	13, 28, 29, 31	fvmptd3 5776	. . . 4 |- ( ( ( R e. Ring /\ X e. B ) /\ ( y e. B /\ z e. B ) ) -> ( ( x e. B |-> ( X .x. x ) ) ` z ) = ( X .x. z ) )
33	27, 32	oveq12d 6076	. . 3 |- ( ( ( R e. Ring /\ X e. B ) /\ ( y e. B /\ z e. B ) ) -> ( ( ( x e. B |-> ( X .x. x ) ) ` y ) ( +g ` R ) ( ( x e. B |-> ( X .x. x ) ) ` z ) ) = ( ( X .x. y ) ( +g ` R ) ( X .x. z ) ) )
34	12, 22, 33	3eqtr4d 2277	. 2 |- ( ( ( R e. Ring /\ X e. B ) /\ ( y e. B /\ z e. B ) ) -> ( ( x e. B |-> ( X .x. x ) ) ` ( y ( +g ` R ) z ) ) = ( ( ( x e. B |-> ( X .x. x ) ) ` y ) ( +g ` R ) ( ( x e. B |-> ( X .x. x ) ) ` z ) ) )
35	1, 1, 2, 2, 4, 4, 8, 34	isghmd 14053	1 |- ( ( R e. Ring /\ X e. B ) -> ( x e. B |-> ( X .x. x ) ) e. ( R GrpHom R ) )

Syntax hints:   -> wi 4   /\ wa 104   /\ w3a 1005   = wceq 1398   e. wcel 2205   |-> cmpt 4176   ` cfv 5357  (class class class)co 6058   Basecbs 13296   +g cplusg 13374   .rcmulr 13375   Grpcgrp 13797   GrpHom cghm 14041   Ringcrg 14224

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-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-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-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-ndx 13299  df-slot 13300  df-base 13302  df-sets 13303  df-plusg 13387  df-mulr 13388  df-mgm 13653  df-sgrp 13699  df-mnd 13714  df-grp 13800  df-ghm 14042  df-mgp 14149  df-ring 14226

This theorem is referenced by: (None)