Theorem subcmnd 14114

Description: A submonoid of a commutative monoid is also commutative. (Contributed by Mario Carneiro, 10-Jan-2015.)

Hypotheses

Ref	Expression
subcmnd.h	|- ( ph -> H = ( G ↾s S ) )
subcmnd.g	|- ( ph -> G e. CMnd )
subcmnd.m	|- ( ph -> H e. Mnd )
subcmnd.s	|- ( ph -> S e. V )

Assertion

Ref	Expression
subcmnd	|- ( ph -> H e. CMnd )

Proof of Theorem subcmnd

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

Step	Hyp	Ref	Expression
1		eqidd 2239	. 2 |- ( ph -> ( Base ` H ) = ( Base ` H ) )
2		subcmnd.h	. . 3 |- ( ph -> H = ( G ↾s S ) )
3		eqidd 2239	. . 3 |- ( ph -> ( +g ` G ) = ( +g ` G ) )
4		subcmnd.s	. . 3 |- ( ph -> S e. V )
5		subcmnd.g	. . 3 |- ( ph -> G e. CMnd )
6	2, 3, 4, 5	ressplusgd 13460	. 2 |- ( ph -> ( +g ` G ) = ( +g ` H ) )
7		subcmnd.m	. 2 |- ( ph -> H e. Mnd )
8	5	3ad2ant1 1049	. . 3 |- ( ( ph /\ x e. ( Base ` H ) /\ y e. ( Base ` H ) ) -> G e. CMnd )
9		eqidd 2239	. . . . . 6 |- ( ph -> ( Base ` G ) = ( Base ` G ) )
10	2, 9, 5, 4	ressbasssd 13400	. . . . 5 |- ( ph -> ( Base ` H ) C_ ( Base ` G ) )
11	10	sselda 3248	. . . 4 |- ( ( ph /\ x e. ( Base ` H ) ) -> x e. ( Base ` G ) )
12	11	3adant3 1048	. . 3 |- ( ( ph /\ x e. ( Base ` H ) /\ y e. ( Base ` H ) ) -> x e. ( Base ` G ) )
13	10	sselda 3248	. . . 4 |- ( ( ph /\ y e. ( Base ` H ) ) -> y e. ( Base ` G ) )
14	13	3adant2 1047	. . 3 |- ( ( ph /\ x e. ( Base ` H ) /\ y e. ( Base ` H ) ) -> y e. ( Base ` G ) )
15		eqid 2238	. . . 4 |- ( Base ` G ) = ( Base ` G )
16		eqid 2238	. . . 4 |- ( +g ` G ) = ( +g ` G )
17	15, 16	cmncom 14082	. . 3 |- ( ( G e. CMnd /\ x e. ( Base ` G ) /\ y e. ( Base ` G ) ) -> ( x ( +g ` G ) y ) = ( y ( +g ` G ) x ) )
18	8, 12, 14, 17	syl3anc 1278	. 2 |- ( ( ph /\ x e. ( Base ` H ) /\ y e. ( Base ` H ) ) -> ( x ( +g ` G ) y ) = ( y ( +g ` G ) x ) )
19	1, 6, 7, 18	iscmnd 14078	1 |- ( ph -> H e. CMnd )

Syntax hints:   -> wi 4   /\ w3a 1009   = wceq 1402   e. wcel 2209   ` cfv 5372  (class class class)co 6075   Basecbs 13330   ↾_s cress 13331   +g cplusg 13408   Mndcmnd 13706  CMndccmn 14064

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 623  ax-in2 624  ax-io 721  ax-5 1500  ax-7 1501  ax-gen 1502  ax-ie1 1546  ax-ie2 1547  ax-8 1557  ax-10 1558  ax-11 1559  ax-i12 1560  ax-bndl 1562  ax-4 1563  ax-17 1579  ax-i9 1583  ax-ial 1587  ax-i5r 1588  ax-14 2212  ax-ext 2220  ax-sep 4244  ax-pow 4306  ax-pr 4341  ax-un 4573  ax-setind 4679  ax-cnex 8260  ax-resscn 8261  ax-1cn 8262  ax-1re 8263  ax-icn 8264  ax-addcl 8265  ax-addrcl 8266  ax-mulcl 8267  ax-addcom 8269  ax-addass 8271  ax-i2m1 8274  ax-0lt1 8275  ax-0id 8277  ax-rnegex 8278  ax-pre-ltirr 8281  ax-pre-ltadd 8285

This theorem depends on definitions:  df-bi 117  df-3an 1011  df-tru 1405  df-fal 1408  df-nf 1514  df-sb 1816  df-eu 2089  df-mo 2090  df-clab 2225  df-cleq 2231  df-clel 2234  df-nfc 2381  df-ne 2421  df-nel 2516  df-ral 2533  df-rex 2534  df-rab 2537  df-v 2823  df-sbc 3052  df-dif 3222  df-un 3224  df-in 3226  df-ss 3233  df-nul 3521  df-pw 3687  df-sn 3711  df-pr 3712  df-op 3714  df-uni 3931  df-int 3966  df-br 4126  df-opab 4188  df-mpt 4189  df-id 4433  df-xp 4775  df-rel 4776  df-cnv 4777  df-co 4778  df-dm 4779  df-rn 4780  df-res 4781  df-iota 5332  df-fun 5374  df-fv 5380  df-ov 6078  df-oprab 6079  df-mpo 6080  df-pnf 8352  df-mnf 8353  df-ltxr 8355  df-inn 9284  df-2 9342  df-ndx 13333  df-slot 13334  df-base 13336  df-sets 13337  df-iress 13338  df-plusg 13421  df-cmn 14066

This theorem is referenced by:  unitabl  14397  subrgcrng  14506