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Theorem gsumvallem2 13395
Description: Lemma for properties of the set of identities of  G. The set of identities of a monoid is exactly the unique identity element. (Contributed by Mario Carneiro, 7-Dec-2014.)
Hypotheses
Ref Expression
gsumvallem2.b  |-  B  =  ( Base `  G
)
gsumvallem2.z  |-  .0.  =  ( 0g `  G )
gsumvallem2.p  |-  .+  =  ( +g  `  G )
gsumvallem2.o  |-  O  =  { x  e.  B  |  A. y  e.  B  ( ( x  .+  y )  =  y  /\  ( y  .+  x )  =  y ) }
Assertion
Ref Expression
gsumvallem2  |-  ( G  e.  Mnd  ->  O  =  {  .0.  } )
Distinct variable groups:    x, y, B   
x, G, y    x,  .+ , y    x,  .0. , y
Allowed substitution hints:    O( x, y)

Proof of Theorem gsumvallem2
StepHypRef Expression
1 gsumvallem2.b . . 3  |-  B  =  ( Base `  G
)
2 gsumvallem2.z . . 3  |-  .0.  =  ( 0g `  G )
3 gsumvallem2.p . . 3  |-  .+  =  ( +g  `  G )
4 gsumvallem2.o . . 3  |-  O  =  { x  e.  B  |  A. y  e.  B  ( ( x  .+  y )  =  y  /\  ( y  .+  x )  =  y ) }
51, 2, 3, 4mgmidsssn0 13286 . 2  |-  ( G  e.  Mnd  ->  O  C_ 
{  .0.  } )
61, 2mndidcl 13332 . . . 4  |-  ( G  e.  Mnd  ->  .0.  e.  B )
71, 3, 2mndlrid 13336 . . . . 5  |-  ( ( G  e.  Mnd  /\  y  e.  B )  ->  ( (  .0.  .+  y )  =  y  /\  ( y  .+  .0.  )  =  y
) )
87ralrimiva 2580 . . . 4  |-  ( G  e.  Mnd  ->  A. y  e.  B  ( (  .0.  .+  y )  =  y  /\  ( y 
.+  .0.  )  =  y ) )
9 oveq1 5963 . . . . . . 7  |-  ( x  =  .0.  ->  (
x  .+  y )  =  (  .0.  .+  y
) )
109eqeq1d 2215 . . . . . 6  |-  ( x  =  .0.  ->  (
( x  .+  y
)  =  y  <->  (  .0.  .+  y )  =  y ) )
1110ovanraleqv 5980 . . . . 5  |-  ( x  =  .0.  ->  ( A. y  e.  B  ( ( x  .+  y )  =  y  /\  ( y  .+  x )  =  y )  <->  A. y  e.  B  ( (  .0.  .+  y )  =  y  /\  ( y  .+  .0.  )  =  y
) ) )
1211, 4elrab2 2936 . . . 4  |-  (  .0. 
e.  O  <->  (  .0.  e.  B  /\  A. y  e.  B  ( (  .0.  .+  y )  =  y  /\  ( y 
.+  .0.  )  =  y ) ) )
136, 8, 12sylanbrc 417 . . 3  |-  ( G  e.  Mnd  ->  .0.  e.  O )
1413snssd 3783 . 2  |-  ( G  e.  Mnd  ->  {  .0.  } 
C_  O )
155, 14eqssd 3214 1  |-  ( G  e.  Mnd  ->  O  =  {  .0.  } )
Colors of variables: wff set class
Syntax hints:    -> wi 4    /\ wa 104    = wceq 1373    e. wcel 2177   A.wral 2485   {crab 2489   {csn 3637   ` cfv 5279  (class class class)co 5956   Basecbs 12902   +g cplusg 12979   0gc0g 13158   Mndcmnd 13318
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-13 2179  ax-14 2180  ax-ext 2188  ax-sep 4169  ax-pow 4225  ax-pr 4260  ax-un 4487  ax-cnex 8031  ax-resscn 8032  ax-1re 8034  ax-addrcl 8037
This theorem depends on definitions:  df-bi 117  df-3an 983  df-tru 1376  df-nf 1485  df-sb 1787  df-eu 2058  df-mo 2059  df-clab 2193  df-cleq 2199  df-clel 2202  df-nfc 2338  df-ral 2490  df-rex 2491  df-reu 2492  df-rmo 2493  df-rab 2494  df-v 2775  df-sbc 3003  df-csb 3098  df-un 3174  df-in 3176  df-ss 3183  df-pw 3622  df-sn 3643  df-pr 3644  df-op 3646  df-uni 3856  df-int 3891  df-br 4051  df-opab 4113  df-mpt 4114  df-id 4347  df-xp 4688  df-rel 4689  df-cnv 4690  df-co 4691  df-dm 4692  df-rn 4693  df-res 4694  df-iota 5240  df-fun 5281  df-fn 5282  df-fv 5287  df-riota 5911  df-ov 5959  df-inn 9052  df-2 9110  df-ndx 12905  df-slot 12906  df-base 12908  df-plusg 12992  df-0g 13160  df-mgm 13258  df-sgrp 13304  df-mnd 13319
This theorem is referenced by: (None)
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