Theorem ringrghm 18605

Description: Right-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
ringrghm	|- ( ( 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 ringrghm

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 2622	. 2 |- ( +g ` R ) = ( +g ` R )
3		ringgrp 18552	. . 3 |- ( R e. Ring -> R e. Grp )
4	3	adantr 481	. 2 |- ( ( R e. Ring /\ X e. B ) -> R e. Grp )
5		ringlghm.t	. . . . . 6 |- .x. = ( .r ` R )
6	1, 5	ringcl 18561	. . . . 5 |- ( ( R e. Ring /\ x e. B /\ X e. B ) -> ( x .x. X ) e. B )
7	6	3expa 1265	. . . 4 |- ( ( ( R e. Ring /\ x e. B ) /\ X e. B ) -> ( x .x. X ) e. B )
8	7	an32s 846	. . 3 |- ( ( ( R e. Ring /\ X e. B ) /\ x e. B ) -> ( x .x. X ) e. B )
9		eqid 2622	. . 3 |- ( x e. B |-> ( x .x. X ) ) = ( x e. B |-> ( x .x. X ) )
10	8, 9	fmptd 6385	. 2 |- ( ( R e. Ring /\ X e. B ) -> ( x e. B |-> ( x .x. X ) ) : B --> B )
11		df-3an 1039	. . . . 5 |- ( ( y e. B /\ z e. B /\ X e. B ) <-> ( ( y e. B /\ z e. B ) /\ X e. B ) )
12	1, 2, 5	ringdir 18567	. . . . 5 |- ( ( R e. Ring /\ ( y e. B /\ z e. B /\ X e. B ) ) -> ( ( y ( +g ` R ) z ) .x. X ) = ( ( y .x. X ) ( +g ` R ) ( z .x. X ) ) )
13	11, 12	sylan2br 493	. . . 4 |- ( ( R e. Ring /\ ( ( y e. B /\ z e. B ) /\ X e. B ) ) -> ( ( y ( +g ` R ) z ) .x. X ) = ( ( y .x. X ) ( +g ` R ) ( z .x. X ) ) )
14	13	anass1rs 849	. . 3 |- ( ( ( R e. Ring /\ X e. B ) /\ ( y e. B /\ z e. B ) ) -> ( ( y ( +g ` R ) z ) .x. X ) = ( ( y .x. X ) ( +g ` R ) ( z .x. X ) ) )
15	1, 2	ringacl 18578	. . . . . 6 |- ( ( R e. Ring /\ y e. B /\ z e. B ) -> ( y ( +g ` R ) z ) e. B )
16	15	3expb 1266	. . . . 5 |- ( ( R e. Ring /\ ( y e. B /\ z e. B ) ) -> ( y ( +g ` R ) z ) e. B )
17	16	adantlr 751	. . . 4 |- ( ( ( R e. Ring /\ X e. B ) /\ ( y e. B /\ z e. B ) ) -> ( y ( +g ` R ) z ) e. B )
18		oveq1 6657	. . . . 5 |- ( x = ( y ( +g ` R ) z ) -> ( x .x. X ) = ( ( y ( +g ` R ) z ) .x. X ) )
19		ovex 6678	. . . . 5 |- ( ( y ( +g ` R ) z ) .x. X ) e. _V
20	18, 9, 19	fvmpt 6282	. . . 4 |- ( ( y ( +g ` R ) z ) e. B -> ( ( x e. B |-> ( x .x. X ) ) ` ( y ( +g ` R ) z ) ) = ( ( y ( +g ` R ) z ) .x. X ) )
21	17, 20	syl 17	. . 3 |- ( ( ( R e. Ring /\ X e. B ) /\ ( y e. B /\ z e. B ) ) -> ( ( x e. B |-> ( x .x. X ) ) ` ( y ( +g ` R ) z ) ) = ( ( y ( +g ` R ) z ) .x. X ) )
22		oveq1 6657	. . . . . 6 |- ( x = y -> ( x .x. X ) = ( y .x. X ) )
23		ovex 6678	. . . . . 6 |- ( y .x. X ) e. _V
24	22, 9, 23	fvmpt 6282	. . . . 5 |- ( y e. B -> ( ( x e. B |-> ( x .x. X ) ) ` y ) = ( y .x. X ) )
25		oveq1 6657	. . . . . 6 |- ( x = z -> ( x .x. X ) = ( z .x. X ) )
26		ovex 6678	. . . . . 6 |- ( z .x. X ) e. _V
27	25, 9, 26	fvmpt 6282	. . . . 5 |- ( z e. B -> ( ( x e. B |-> ( x .x. X ) ) ` z ) = ( z .x. X ) )
28	24, 27	oveqan12d 6669	. . . 4 |- ( ( y e. B /\ z e. B ) -> ( ( ( x e. B |-> ( x .x. X ) ) ` y ) ( +g ` R ) ( ( x e. B |-> ( x .x. X ) ) ` z ) ) = ( ( y .x. X ) ( +g ` R ) ( z .x. X ) ) )
29	28	adantl 482	. . 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 ) ) = ( ( y .x. X ) ( +g ` R ) ( z .x. X ) ) )
30	14, 21, 29	3eqtr4d 2666	. 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 ) ) )
31	1, 1, 2, 2, 4, 4, 10, 30	isghmd 17669	1 |- ( ( R e. Ring /\ X e. B ) -> ( x e. B |-> ( x .x. X ) ) e. ( R GrpHom R ) )

Syntax hints:   -> wi 4   /\ wa 384   /\ w3a 1037   = wceq 1483   e. wcel 1990   |-> cmpt 4729   ` cfv 5888  (class class class)co 6650   Basecbs 15857   +g cplusg 15941   .rcmulr 15942   Grpcgrp 17422   GrpHom cghm 17657   Ringcrg 18547

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1722  ax-4 1737  ax-5 1839  ax-6 1888  ax-7 1935  ax-8 1992  ax-9 1999  ax-10 2019  ax-11 2034  ax-12 2047  ax-13 2246  ax-ext 2602  ax-rep 4771  ax-sep 4781  ax-nul 4789  ax-pow 4843  ax-pr 4906  ax-un 6949  ax-cnex 9992  ax-resscn 9993  ax-1cn 9994  ax-icn 9995  ax-addcl 9996  ax-addrcl 9997  ax-mulcl 9998  ax-mulrcl 9999  ax-mulcom 10000  ax-addass 10001  ax-mulass 10002  ax-distr 10003  ax-i2m1 10004  ax-1ne0 10005  ax-1rid 10006  ax-rnegex 10007  ax-rrecex 10008  ax-cnre 10009  ax-pre-lttri 10010  ax-pre-lttrn 10011  ax-pre-ltadd 10012  ax-pre-mulgt0 10013

This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  df-3or 1038  df-3an 1039  df-tru 1486  df-ex 1705  df-nf 1710  df-sb 1881  df-eu 2474  df-mo 2475  df-clab 2609  df-cleq 2615  df-clel 2618  df-nfc 2753  df-ne 2795  df-nel 2898  df-ral 2917  df-rex 2918  df-reu 2919  df-rab 2921  df-v 3202  df-sbc 3436  df-csb 3534  df-dif 3577  df-un 3579  df-in 3581  df-ss 3588  df-pss 3590  df-nul 3916  df-if 4087  df-pw 4160  df-sn 4178  df-pr 4180  df-tp 4182  df-op 4184  df-uni 4437  df-iun 4522  df-br 4654  df-opab 4713  df-mpt 4730  df-tr 4753  df-id 5024  df-eprel 5029  df-po 5035  df-so 5036  df-fr 5073  df-we 5075  df-xp 5120  df-rel 5121  df-cnv 5122  df-co 5123  df-dm 5124  df-rn 5125  df-res 5126  df-ima 5127  df-pred 5680  df-ord 5726  df-on 5727  df-lim 5728  df-suc 5729  df-iota 5851  df-fun 5890  df-fn 5891  df-f 5892  df-f1 5893  df-fo 5894  df-f1o 5895  df-fv 5896  df-riota 6611  df-ov 6653  df-oprab 6654  df-mpt2 6655  df-om 7066  df-wrecs 7407  df-recs 7468  df-rdg 7506  df-er 7742  df-en 7956  df-dom 7957  df-sdom 7958  df-pnf 10076  df-mnf 10077  df-xr 10078  df-ltxr 10079  df-le 10080  df-sub 10268  df-neg 10269  df-nn 11021  df-2 11079  df-ndx 15860  df-slot 15861  df-base 15863  df-sets 15864  df-plusg 15954  df-mgm 17242  df-sgrp 17284  df-mnd 17295  df-grp 17425  df-ghm 17658  df-mgp 18490  df-ring 18549

This theorem is referenced by:  gsummulc1  18606  fidomndrnglem  19306