Theorem submcl 13734

Description: Submonoids are closed under the monoid operation. (Contributed by Mario Carneiro, 10-Mar-2015.)

Hypothesis

Ref	Expression
submcl.p	|- .+ = ( +g ` M )

Assertion

Ref	Expression
submcl	|- ( ( S e. (SubMnd ` M ) /\ X e. S /\ Y e. S ) -> ( X .+ Y ) e. S )

Proof of Theorem submcl

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

Step	Hyp	Ref	Expression
1		submrcl 13726	. . . . . . 7 |- ( S e. (SubMnd ` M ) -> M e. Mnd )
2		eqid 2234	. . . . . . . 8 |- ( Base ` M ) = ( Base ` M )
3		eqid 2234	. . . . . . . 8 |- ( 0g ` M ) = ( 0g ` M )
4		submcl.p	. . . . . . . 8 |- .+ = ( +g ` M )
5	2, 3, 4	issubm 13727	. . . . . . 7 |- ( M e. Mnd -> ( S e. (SubMnd ` M ) <-> ( S C_ ( Base ` M ) /\ ( 0g ` M ) e. S /\ A. x e. S A. y e. S ( x .+ y ) e. S ) ) )
6	1, 5	syl 14	. . . . . 6 |- ( S e. (SubMnd ` M ) -> ( S e. (SubMnd ` M ) <-> ( S C_ ( Base ` M ) /\ ( 0g ` M ) e. S /\ A. x e. S A. y e. S ( x .+ y ) e. S ) ) )
7	6	ibi 176	. . . . 5 |- ( S e. (SubMnd ` M ) -> ( S C_ ( Base ` M ) /\ ( 0g ` M ) e. S /\ A. x e. S A. y e. S ( x .+ y ) e. S ) )
8	7	simp3d 1038	. . . 4 |- ( S e. (SubMnd ` M ) -> A. x e. S A. y e. S ( x .+ y ) e. S )
9		ovrspc2v 6084	. . . 4 |- ( ( ( X e. S /\ Y e. S ) /\ A. x e. S A. y e. S ( x .+ y ) e. S ) -> ( X .+ Y ) e. S )
10	8, 9	sylan2 286	. . 3 |- ( ( ( X e. S /\ Y e. S ) /\ S e. (SubMnd ` M ) ) -> ( X .+ Y ) e. S )
11	10	ancoms 268	. 2 |- ( ( S e. (SubMnd ` M ) /\ ( X e. S /\ Y e. S ) ) -> ( X .+ Y ) e. S )
12	11	3impb 1226	1 |- ( ( S e. (SubMnd ` M ) /\ X e. S /\ Y e. S ) -> ( X .+ Y ) e. S )

Syntax hints:   -> wi 4   /\ wa 104   <-> wb 105   /\ w3a 1005   = wceq 1398   e. wcel 2205   A.wral 2522   C_ wss 3214   ` cfv 5357  (class class class)co 6058   Basecbs 13296   +g cplusg 13374   0gc0g 13553   Mndcmnd 13677  SubMndcsubmnd 13713

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-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-sep 4233  ax-pow 4292  ax-pr 4327  ax-un 4559  ax-cnex 8234  ax-resscn 8235  ax-1re 8237  ax-addrcl 8240

This theorem depends on definitions:  df-bi 117  df-3an 1007  df-tru 1401  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-ral 2527  df-rex 2528  df-rab 2531  df-v 2817  df-sbc 3046  df-csb 3142  df-un 3218  df-in 3220  df-ss 3227  df-pw 3676  df-sn 3700  df-pr 3701  df-op 3703  df-uni 3920  df-int 3955  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-fv 5365  df-ov 6061  df-inn 9255  df-ndx 13299  df-slot 13300  df-base 13302  df-submnd 13715

This theorem is referenced by:  resmhm  13742  mhmima  13746  gsumwsubmcl  13751  submmulgcl  13918  gsumfzsubmcl  14091