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Theorem cmncom 13753
Description: A commutative monoid is commutative. (Contributed by Mario Carneiro, 6-Jan-2015.)
Hypotheses
Ref Expression
ablcom.b  |-  B  =  ( Base `  G
)
ablcom.p  |-  .+  =  ( +g  `  G )
Assertion
Ref Expression
cmncom  |-  ( ( G  e. CMnd  /\  X  e.  B  /\  Y  e.  B )  ->  ( X  .+  Y )  =  ( Y  .+  X
) )

Proof of Theorem cmncom
Dummy variables  x  y are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 ablcom.b . . . . . 6  |-  B  =  ( Base `  G
)
2 ablcom.p . . . . . 6  |-  .+  =  ( +g  `  G )
31, 2iscmn 13744 . . . . 5  |-  ( G  e. CMnd 
<->  ( G  e.  Mnd  /\ 
A. x  e.  B  A. y  e.  B  ( x  .+  y )  =  ( y  .+  x ) ) )
43simprbi 275 . . . 4  |-  ( G  e. CMnd  ->  A. x  e.  B  A. y  e.  B  ( x  .+  y )  =  ( y  .+  x ) )
5 rsp2 2558 . . . . 5  |-  ( A. x  e.  B  A. y  e.  B  (
x  .+  y )  =  ( y  .+  x )  ->  (
( x  e.  B  /\  y  e.  B
)  ->  ( x  .+  y )  =  ( y  .+  x ) ) )
65imp 124 . . . 4  |-  ( ( A. x  e.  B  A. y  e.  B  ( x  .+  y )  =  ( y  .+  x )  /\  (
x  e.  B  /\  y  e.  B )
)  ->  ( x  .+  y )  =  ( y  .+  x ) )
74, 6sylan 283 . . 3  |-  ( ( G  e. CMnd  /\  (
x  e.  B  /\  y  e.  B )
)  ->  ( x  .+  y )  =  ( y  .+  x ) )
87caovcomg 6125 . 2  |-  ( ( G  e. CMnd  /\  ( X  e.  B  /\  Y  e.  B )
)  ->  ( X  .+  Y )  =  ( Y  .+  X ) )
983impb 1202 1  |-  ( ( G  e. CMnd  /\  X  e.  B  /\  Y  e.  B )  ->  ( X  .+  Y )  =  ( Y  .+  X
) )
Colors of variables: wff set class
Syntax hints:    -> wi 4    /\ wa 104    /\ w3a 981    = wceq 1373    e. wcel 2178   A.wral 2486   ` cfv 5290  (class class class)co 5967   Basecbs 12947   +g cplusg 13024   Mndcmnd 13363  CMndccmn 13735
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 711  ax-5 1471  ax-7 1472  ax-gen 1473  ax-ie1 1517  ax-ie2 1518  ax-8 1528  ax-10 1529  ax-11 1530  ax-i12 1531  ax-bndl 1533  ax-4 1534  ax-17 1550  ax-i9 1554  ax-ial 1558  ax-i5r 1559  ax-ext 2189
This theorem depends on definitions:  df-bi 117  df-3an 983  df-tru 1376  df-nf 1485  df-sb 1787  df-clab 2194  df-cleq 2200  df-clel 2203  df-nfc 2339  df-ral 2491  df-rex 2492  df-rab 2495  df-v 2778  df-un 3178  df-sn 3649  df-pr 3650  df-op 3652  df-uni 3865  df-br 4060  df-iota 5251  df-fv 5298  df-ov 5970  df-cmn 13737
This theorem is referenced by:  ablcom  13754  cmn32  13755  cmn4  13756  cmn12  13757  rinvmod  13760  ghmcmn  13778  subcmnd  13784  gsumfzreidx  13788  gsumfzmptfidmadd  13790  srgcom  13860  crngcom  13891
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