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Theorem galcan 16666
Description: The action of a particular group element is left-cancelable. (Contributed by FL, 17-May-2010.) (Revised by Mario Carneiro, 13-Jan-2015.)
Hypothesis
Ref Expression
galcan.1  |-  X  =  ( Base `  G
)
Assertion
Ref Expression
galcan  |-  ( ( 
.(+)  e.  ( G  GrpAct  Y )  /\  ( A  e.  X  /\  B  e.  Y  /\  C  e.  Y )
)  ->  ( ( A  .(+)  B )  =  ( A  .(+)  C )  <-> 
B  =  C ) )

Proof of Theorem galcan
StepHypRef Expression
1 oveq2 6286 . . 3  |-  ( ( A  .(+)  B )  =  ( A  .(+)  C )  ->  ( (
( invg `  G ) `  A
)  .(+)  ( A  .(+)  B ) )  =  ( ( ( invg `  G ) `  A
)  .(+)  ( A  .(+)  C ) ) )
2 simpl 455 . . . . . . . 8  |-  ( ( 
.(+)  e.  ( G  GrpAct  Y )  /\  ( A  e.  X  /\  B  e.  Y  /\  C  e.  Y )
)  ->  .(+)  e.  ( G  GrpAct  Y ) )
3 gagrp 16654 . . . . . . . 8  |-  (  .(+)  e.  ( G  GrpAct  Y )  ->  G  e.  Grp )
42, 3syl 17 . . . . . . 7  |-  ( ( 
.(+)  e.  ( G  GrpAct  Y )  /\  ( A  e.  X  /\  B  e.  Y  /\  C  e.  Y )
)  ->  G  e.  Grp )
5 simpr1 1003 . . . . . . 7  |-  ( ( 
.(+)  e.  ( G  GrpAct  Y )  /\  ( A  e.  X  /\  B  e.  Y  /\  C  e.  Y )
)  ->  A  e.  X )
6 galcan.1 . . . . . . . 8  |-  X  =  ( Base `  G
)
7 eqid 2402 . . . . . . . 8  |-  ( +g  `  G )  =  ( +g  `  G )
8 eqid 2402 . . . . . . . 8  |-  ( 0g
`  G )  =  ( 0g `  G
)
9 eqid 2402 . . . . . . . 8  |-  ( invg `  G )  =  ( invg `  G )
106, 7, 8, 9grplinv 16420 . . . . . . 7  |-  ( ( G  e.  Grp  /\  A  e.  X )  ->  ( ( ( invg `  G ) `
 A ) ( +g  `  G ) A )  =  ( 0g `  G ) )
114, 5, 10syl2anc 659 . . . . . 6  |-  ( ( 
.(+)  e.  ( G  GrpAct  Y )  /\  ( A  e.  X  /\  B  e.  Y  /\  C  e.  Y )
)  ->  ( (
( invg `  G ) `  A
) ( +g  `  G
) A )  =  ( 0g `  G
) )
1211oveq1d 6293 . . . . 5  |-  ( ( 
.(+)  e.  ( G  GrpAct  Y )  /\  ( A  e.  X  /\  B  e.  Y  /\  C  e.  Y )
)  ->  ( (
( ( invg `  G ) `  A
) ( +g  `  G
) A )  .(+)  B )  =  ( ( 0g `  G ) 
.(+)  B ) )
136, 9grpinvcl 16419 . . . . . . 7  |-  ( ( G  e.  Grp  /\  A  e.  X )  ->  ( ( invg `  G ) `  A
)  e.  X )
144, 5, 13syl2anc 659 . . . . . 6  |-  ( ( 
.(+)  e.  ( G  GrpAct  Y )  /\  ( A  e.  X  /\  B  e.  Y  /\  C  e.  Y )
)  ->  ( ( invg `  G ) `
 A )  e.  X )
15 simpr2 1004 . . . . . 6  |-  ( ( 
.(+)  e.  ( G  GrpAct  Y )  /\  ( A  e.  X  /\  B  e.  Y  /\  C  e.  Y )
)  ->  B  e.  Y )
166, 7gaass 16659 . . . . . 6  |-  ( ( 
.(+)  e.  ( G  GrpAct  Y )  /\  (
( ( invg `  G ) `  A
)  e.  X  /\  A  e.  X  /\  B  e.  Y )
)  ->  ( (
( ( invg `  G ) `  A
) ( +g  `  G
) A )  .(+)  B )  =  ( ( ( invg `  G ) `  A
)  .(+)  ( A  .(+)  B ) ) )
172, 14, 5, 15, 16syl13anc 1232 . . . . 5  |-  ( ( 
.(+)  e.  ( G  GrpAct  Y )  /\  ( A  e.  X  /\  B  e.  Y  /\  C  e.  Y )
)  ->  ( (
( ( invg `  G ) `  A
) ( +g  `  G
) A )  .(+)  B )  =  ( ( ( invg `  G ) `  A
)  .(+)  ( A  .(+)  B ) ) )
188gagrpid 16656 . . . . . 6  |-  ( ( 
.(+)  e.  ( G  GrpAct  Y )  /\  B  e.  Y )  ->  (
( 0g `  G
)  .(+)  B )  =  B )
192, 15, 18syl2anc 659 . . . . 5  |-  ( ( 
.(+)  e.  ( G  GrpAct  Y )  /\  ( A  e.  X  /\  B  e.  Y  /\  C  e.  Y )
)  ->  ( ( 0g `  G )  .(+)  B )  =  B )
2012, 17, 193eqtr3d 2451 . . . 4  |-  ( ( 
.(+)  e.  ( G  GrpAct  Y )  /\  ( A  e.  X  /\  B  e.  Y  /\  C  e.  Y )
)  ->  ( (
( invg `  G ) `  A
)  .(+)  ( A  .(+)  B ) )  =  B )
2111oveq1d 6293 . . . . 5  |-  ( ( 
.(+)  e.  ( G  GrpAct  Y )  /\  ( A  e.  X  /\  B  e.  Y  /\  C  e.  Y )
)  ->  ( (
( ( invg `  G ) `  A
) ( +g  `  G
) A )  .(+)  C )  =  ( ( 0g `  G ) 
.(+)  C ) )
22 simpr3 1005 . . . . . 6  |-  ( ( 
.(+)  e.  ( G  GrpAct  Y )  /\  ( A  e.  X  /\  B  e.  Y  /\  C  e.  Y )
)  ->  C  e.  Y )
236, 7gaass 16659 . . . . . 6  |-  ( ( 
.(+)  e.  ( G  GrpAct  Y )  /\  (
( ( invg `  G ) `  A
)  e.  X  /\  A  e.  X  /\  C  e.  Y )
)  ->  ( (
( ( invg `  G ) `  A
) ( +g  `  G
) A )  .(+)  C )  =  ( ( ( invg `  G ) `  A
)  .(+)  ( A  .(+)  C ) ) )
242, 14, 5, 22, 23syl13anc 1232 . . . . 5  |-  ( ( 
.(+)  e.  ( G  GrpAct  Y )  /\  ( A  e.  X  /\  B  e.  Y  /\  C  e.  Y )
)  ->  ( (
( ( invg `  G ) `  A
) ( +g  `  G
) A )  .(+)  C )  =  ( ( ( invg `  G ) `  A
)  .(+)  ( A  .(+)  C ) ) )
258gagrpid 16656 . . . . . 6  |-  ( ( 
.(+)  e.  ( G  GrpAct  Y )  /\  C  e.  Y )  ->  (
( 0g `  G
)  .(+)  C )  =  C )
262, 22, 25syl2anc 659 . . . . 5  |-  ( ( 
.(+)  e.  ( G  GrpAct  Y )  /\  ( A  e.  X  /\  B  e.  Y  /\  C  e.  Y )
)  ->  ( ( 0g `  G )  .(+)  C )  =  C )
2721, 24, 263eqtr3d 2451 . . . 4  |-  ( ( 
.(+)  e.  ( G  GrpAct  Y )  /\  ( A  e.  X  /\  B  e.  Y  /\  C  e.  Y )
)  ->  ( (
( invg `  G ) `  A
)  .(+)  ( A  .(+)  C ) )  =  C )
2820, 27eqeq12d 2424 . . 3  |-  ( ( 
.(+)  e.  ( G  GrpAct  Y )  /\  ( A  e.  X  /\  B  e.  Y  /\  C  e.  Y )
)  ->  ( (
( ( invg `  G ) `  A
)  .(+)  ( A  .(+)  B ) )  =  ( ( ( invg `  G ) `  A
)  .(+)  ( A  .(+)  C ) )  <->  B  =  C ) )
291, 28syl5ib 219 . 2  |-  ( ( 
.(+)  e.  ( G  GrpAct  Y )  /\  ( A  e.  X  /\  B  e.  Y  /\  C  e.  Y )
)  ->  ( ( A  .(+)  B )  =  ( A  .(+)  C )  ->  B  =  C ) )
30 oveq2 6286 . 2  |-  ( B  =  C  ->  ( A  .(+)  B )  =  ( A  .(+)  C ) )
3129, 30impbid1 203 1  |-  ( ( 
.(+)  e.  ( G  GrpAct  Y )  /\  ( A  e.  X  /\  B  e.  Y  /\  C  e.  Y )
)  ->  ( ( A  .(+)  B )  =  ( A  .(+)  C )  <-> 
B  =  C ) )
Colors of variables: wff setvar class
Syntax hints:    -> wi 4    <-> wb 184    /\ wa 367    /\ w3a 974    = wceq 1405    e. wcel 1842   ` cfv 5569  (class class class)co 6278   Basecbs 14841   +g cplusg 14909   0gc0g 15054   Grpcgrp 16377   invgcminusg 16378    GrpAct cga 16651
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1639  ax-4 1652  ax-5 1725  ax-6 1771  ax-7 1814  ax-8 1844  ax-9 1846  ax-10 1861  ax-11 1866  ax-12 1878  ax-13 2026  ax-ext 2380  ax-rep 4507  ax-sep 4517  ax-nul 4525  ax-pow 4572  ax-pr 4630  ax-un 6574
This theorem depends on definitions:  df-bi 185  df-or 368  df-an 369  df-3an 976  df-tru 1408  df-ex 1634  df-nf 1638  df-sb 1764  df-eu 2242  df-mo 2243  df-clab 2388  df-cleq 2394  df-clel 2397  df-nfc 2552  df-ne 2600  df-ral 2759  df-rex 2760  df-reu 2761  df-rmo 2762  df-rab 2763  df-v 3061  df-sbc 3278  df-csb 3374  df-dif 3417  df-un 3419  df-in 3421  df-ss 3428  df-nul 3739  df-if 3886  df-pw 3957  df-sn 3973  df-pr 3975  df-op 3979  df-uni 4192  df-iun 4273  df-br 4396  df-opab 4454  df-mpt 4455  df-id 4738  df-xp 4829  df-rel 4830  df-cnv 4831  df-co 4832  df-dm 4833  df-rn 4834  df-res 4835  df-ima 4836  df-iota 5533  df-fun 5571  df-fn 5572  df-f 5573  df-f1 5574  df-fo 5575  df-f1o 5576  df-fv 5577  df-riota 6240  df-ov 6281  df-oprab 6282  df-mpt2 6283  df-map 7459  df-0g 15056  df-mgm 16196  df-sgrp 16235  df-mnd 16245  df-grp 16381  df-minusg 16382  df-ga 16652
This theorem is referenced by:  gacan  16667
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