Theorem crngcom 13513

Description: A commutative ring's multiplication operation is commutative. (Contributed by Mario Carneiro, 7-Jan-2015.)

Hypotheses

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

Assertion

Ref	Expression
crngcom	|- ( ( R e. CRing /\ X e. B /\ Y e. B ) -> ( X .x. Y ) = ( Y .x. X ) )

Proof of Theorem crngcom

Step	Hyp	Ref	Expression
1		eqid 2193	. . . . 5 |- (mulGrp ` R ) = (mulGrp ` R )
2	1	crngmgp 13503	. . . 4 |- ( R e. CRing -> (mulGrp ` R ) e. CMnd )
3	2	3ad2ant1 1020	. . 3 |- ( ( R e. CRing /\ X e. B /\ Y e. B ) -> (mulGrp ` R ) e. CMnd )
4		simp2 1000	. . . 4 |- ( ( R e. CRing /\ X e. B /\ Y e. B ) -> X e. B )
5		ringcl.b	. . . . . 6 |- B = ( Base ` R )
6	1, 5	mgpbasg 13425	. . . . 5 |- ( R e. CRing -> B = ( Base ` (mulGrp ` R ) ) )
7	6	3ad2ant1 1020	. . . 4 |- ( ( R e. CRing /\ X e. B /\ Y e. B ) -> B = ( Base ` (mulGrp ` R ) ) )
8	4, 7	eleqtrd 2272	. . 3 |- ( ( R e. CRing /\ X e. B /\ Y e. B ) -> X e. ( Base ` (mulGrp ` R ) ) )
9		simp3 1001	. . . 4 |- ( ( R e. CRing /\ X e. B /\ Y e. B ) -> Y e. B )
10	9, 7	eleqtrd 2272	. . 3 |- ( ( R e. CRing /\ X e. B /\ Y e. B ) -> Y e. ( Base ` (mulGrp ` R ) ) )
11		eqid 2193	. . . 4 |- ( Base ` (mulGrp ` R ) ) = ( Base ` (mulGrp ` R ) )
12		eqid 2193	. . . 4 |- ( +g ` (mulGrp ` R ) ) = ( +g ` (mulGrp ` R ) )
13	11, 12	cmncom 13375	. . 3 |- ( ( (mulGrp ` R ) e. CMnd /\ X e. ( Base ` (mulGrp ` R ) ) /\ Y e. ( Base ` (mulGrp ` R ) ) ) -> ( X ( +g ` (mulGrp ` R ) ) Y ) = ( Y ( +g ` (mulGrp ` R ) ) X ) )
14	3, 8, 10, 13	syl3anc 1249	. 2 |- ( ( R e. CRing /\ X e. B /\ Y e. B ) -> ( X ( +g ` (mulGrp ` R ) ) Y ) = ( Y ( +g ` (mulGrp ` R ) ) X ) )
15		ringcl.t	. . . . 5 |- .x. = ( .r ` R )
16	1, 15	mgpplusgg 13423	. . . 4 |- ( R e. CRing -> .x. = ( +g ` (mulGrp ` R ) ) )
17	16	3ad2ant1 1020	. . 3 |- ( ( R e. CRing /\ X e. B /\ Y e. B ) -> .x. = ( +g ` (mulGrp ` R ) ) )
18	17	oveqd 5936	. 2 |- ( ( R e. CRing /\ X e. B /\ Y e. B ) -> ( X .x. Y ) = ( X ( +g ` (mulGrp ` R ) ) Y ) )
19	17	oveqd 5936	. 2 |- ( ( R e. CRing /\ X e. B /\ Y e. B ) -> ( Y .x. X ) = ( Y ( +g ` (mulGrp ` R ) ) X ) )
20	14, 18, 19	3eqtr4d 2236	1 |- ( ( R e. CRing /\ X e. B /\ Y e. B ) -> ( X .x. Y ) = ( Y .x. X ) )

Syntax hints:   -> wi 4   /\ w3a 980   = wceq 1364   e. wcel 2164   ` cfv 5255  (class class class)co 5919   Basecbs 12621   +g cplusg 12698   .rcmulr 12699  CMndccmn 13357  mulGrpcmgp 13419   CRingccrg 13496

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 615  ax-in2 616  ax-io 710  ax-5 1458  ax-7 1459  ax-gen 1460  ax-ie1 1504  ax-ie2 1505  ax-8 1515  ax-10 1516  ax-11 1517  ax-i12 1518  ax-bndl 1520  ax-4 1521  ax-17 1537  ax-i9 1541  ax-ial 1545  ax-i5r 1546  ax-13 2166  ax-14 2167  ax-ext 2175  ax-sep 4148  ax-pow 4204  ax-pr 4239  ax-un 4465  ax-setind 4570  ax-cnex 7965  ax-resscn 7966  ax-1cn 7967  ax-1re 7968  ax-icn 7969  ax-addcl 7970  ax-addrcl 7971  ax-mulcl 7972  ax-addcom 7974  ax-addass 7976  ax-i2m1 7979  ax-0lt1 7980  ax-0id 7982  ax-rnegex 7983  ax-pre-ltirr 7986  ax-pre-ltadd 7990

This theorem depends on definitions:  df-bi 117  df-3an 982  df-tru 1367  df-fal 1370  df-nf 1472  df-sb 1774  df-eu 2045  df-mo 2046  df-clab 2180  df-cleq 2186  df-clel 2189  df-nfc 2325  df-ne 2365  df-nel 2460  df-ral 2477  df-rex 2478  df-rab 2481  df-v 2762  df-sbc 2987  df-csb 3082  df-dif 3156  df-un 3158  df-in 3160  df-ss 3167  df-nul 3448  df-pw 3604  df-sn 3625  df-pr 3626  df-op 3628  df-uni 3837  df-int 3872  df-br 4031  df-opab 4092  df-mpt 4093  df-id 4325  df-xp 4666  df-rel 4667  df-cnv 4668  df-co 4669  df-dm 4670  df-rn 4671  df-res 4672  df-iota 5216  df-fun 5257  df-fn 5258  df-fv 5263  df-ov 5922  df-oprab 5923  df-mpo 5924  df-pnf 8058  df-mnf 8059  df-ltxr 8061  df-inn 8985  df-2 9043  df-3 9044  df-ndx 12624  df-slot 12625  df-base 12627  df-sets 12628  df-plusg 12711  df-mulr 12712  df-cmn 13359  df-mgp 13420  df-cring 13498

This theorem is referenced by:  crngoppr  13571  unitmulclb  13613  rdivmuldivd  13643  rmodislmodlem  13849  quscrng  14032