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Theorem omllaw 34530
Description: The orthomodular law. (Contributed by NM, 18-Sep-2011.)
Hypotheses
Ref Expression
omllaw.b  |-  B  =  ( Base `  K
)
omllaw.l  |-  .<_  =  ( le `  K )
omllaw.j  |-  .\/  =  ( join `  K )
omllaw.m  |-  ./\  =  ( meet `  K )
omllaw.o  |-  ._|_  =  ( oc `  K )
Assertion
Ref Expression
omllaw  |-  ( ( K  e.  OML  /\  X  e.  B  /\  Y  e.  B )  ->  ( X  .<_  Y  ->  Y  =  ( X  .\/  ( Y  ./\  (  ._|_  `  X ) ) ) ) )

Proof of Theorem omllaw
Dummy variables  x  y are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 omllaw.b . . . . 5  |-  B  =  ( Base `  K
)
2 omllaw.l . . . . 5  |-  .<_  =  ( le `  K )
3 omllaw.j . . . . 5  |-  .\/  =  ( join `  K )
4 omllaw.m . . . . 5  |-  ./\  =  ( meet `  K )
5 omllaw.o . . . . 5  |-  ._|_  =  ( oc `  K )
61, 2, 3, 4, 5isoml 34525 . . . 4  |-  ( K  e.  OML  <->  ( K  e.  OL  /\  A. x  e.  B  A. y  e.  B  ( x  .<_  y  ->  y  =  ( x  .\/  ( y 
./\  (  ._|_  `  x
) ) ) ) ) )
76simprbi 480 . . 3  |-  ( K  e.  OML  ->  A. x  e.  B  A. y  e.  B  ( x  .<_  y  ->  y  =  ( x  .\/  ( y 
./\  (  ._|_  `  x
) ) ) ) )
8 breq1 4656 . . . . 5  |-  ( x  =  X  ->  (
x  .<_  y  <->  X  .<_  y ) )
9 id 22 . . . . . . 7  |-  ( x  =  X  ->  x  =  X )
10 fveq2 6191 . . . . . . . 8  |-  ( x  =  X  ->  (  ._|_  `  x )  =  (  ._|_  `  X ) )
1110oveq2d 6666 . . . . . . 7  |-  ( x  =  X  ->  (
y  ./\  (  ._|_  `  x ) )  =  ( y  ./\  (  ._|_  `  X ) ) )
129, 11oveq12d 6668 . . . . . 6  |-  ( x  =  X  ->  (
x  .\/  ( y  ./\  (  ._|_  `  x
) ) )  =  ( X  .\/  (
y  ./\  (  ._|_  `  X ) ) ) )
1312eqeq2d 2632 . . . . 5  |-  ( x  =  X  ->  (
y  =  ( x 
.\/  ( y  ./\  (  ._|_  `  x )
) )  <->  y  =  ( X  .\/  ( y 
./\  (  ._|_  `  X
) ) ) ) )
148, 13imbi12d 334 . . . 4  |-  ( x  =  X  ->  (
( x  .<_  y  -> 
y  =  ( x 
.\/  ( y  ./\  (  ._|_  `  x )
) ) )  <->  ( X  .<_  y  ->  y  =  ( X  .\/  ( y 
./\  (  ._|_  `  X
) ) ) ) ) )
15 breq2 4657 . . . . 5  |-  ( y  =  Y  ->  ( X  .<_  y  <->  X  .<_  Y ) )
16 id 22 . . . . . 6  |-  ( y  =  Y  ->  y  =  Y )
17 oveq1 6657 . . . . . . 7  |-  ( y  =  Y  ->  (
y  ./\  (  ._|_  `  X ) )  =  ( Y  ./\  (  ._|_  `  X ) ) )
1817oveq2d 6666 . . . . . 6  |-  ( y  =  Y  ->  ( X  .\/  ( y  ./\  (  ._|_  `  X )
) )  =  ( X  .\/  ( Y 
./\  (  ._|_  `  X
) ) ) )
1916, 18eqeq12d 2637 . . . . 5  |-  ( y  =  Y  ->  (
y  =  ( X 
.\/  ( y  ./\  (  ._|_  `  X )
) )  <->  Y  =  ( X  .\/  ( Y 
./\  (  ._|_  `  X
) ) ) ) )
2015, 19imbi12d 334 . . . 4  |-  ( y  =  Y  ->  (
( X  .<_  y  -> 
y  =  ( X 
.\/  ( y  ./\  (  ._|_  `  X )
) ) )  <->  ( X  .<_  Y  ->  Y  =  ( X  .\/  ( Y 
./\  (  ._|_  `  X
) ) ) ) ) )
2114, 20rspc2v 3322 . . 3  |-  ( ( X  e.  B  /\  Y  e.  B )  ->  ( A. x  e.  B  A. y  e.  B  ( x  .<_  y  ->  y  =  ( x  .\/  ( y 
./\  (  ._|_  `  x
) ) ) )  ->  ( X  .<_  Y  ->  Y  =  ( X  .\/  ( Y 
./\  (  ._|_  `  X
) ) ) ) ) )
227, 21syl5com 31 . 2  |-  ( K  e.  OML  ->  (
( X  e.  B  /\  Y  e.  B
)  ->  ( X  .<_  Y  ->  Y  =  ( X  .\/  ( Y 
./\  (  ._|_  `  X
) ) ) ) ) )
23223impib 1262 1  |-  ( ( K  e.  OML  /\  X  e.  B  /\  Y  e.  B )  ->  ( X  .<_  Y  ->  Y  =  ( X  .\/  ( Y  ./\  (  ._|_  `  X ) ) ) ) )
Colors of variables: wff setvar class
Syntax hints:    -> wi 4    /\ wa 384    /\ w3a 1037    = wceq 1483    e. wcel 1990   A.wral 2912   class class class wbr 4653   ` cfv 5888  (class class class)co 6650   Basecbs 15857   lecple 15948   occoc 15949   joincjn 16944   meetcmee 16945   OLcol 34461   OMLcoml 34462
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1722  ax-4 1737  ax-5 1839  ax-6 1888  ax-7 1935  ax-9 1999  ax-10 2019  ax-11 2034  ax-12 2047  ax-13 2246  ax-ext 2602
This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  df-3an 1039  df-tru 1486  df-ex 1705  df-nf 1710  df-sb 1881  df-clab 2609  df-cleq 2615  df-clel 2618  df-nfc 2753  df-ral 2917  df-rex 2918  df-rab 2921  df-v 3202  df-dif 3577  df-un 3579  df-in 3581  df-ss 3588  df-nul 3916  df-if 4087  df-sn 4178  df-pr 4180  df-op 4184  df-uni 4437  df-br 4654  df-iota 5851  df-fv 5896  df-ov 6653  df-oml 34466
This theorem is referenced by:  omllaw2N  34531  omllaw3  34532  omllaw4  34533
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