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Theorem lgsdir2lem5 20980
Description: Lemma for lgsdir2 20981. (Contributed by Mario Carneiro, 4-Feb-2015.)
Assertion
Ref Expression
lgsdir2lem5  |-  ( ( ( A  e.  ZZ  /\  B  e.  ZZ )  /\  ( ( A  mod  8 )  e. 
{ 3 ,  5 }  /\  ( B  mod  8 )  e. 
{ 3 ,  5 } ) )  -> 
( ( A  x.  B )  mod  8
)  e.  { 1 ,  7 } )

Proof of Theorem lgsdir2lem5
StepHypRef Expression
1 ovex 6047 . . . . . . 7  |-  ( A  mod  8 )  e. 
_V
21elpr 3777 . . . . . 6  |-  ( ( A  mod  8 )  e.  { 3 ,  5 }  <->  ( ( A  mod  8 )  =  3  \/  ( A  mod  8 )  =  5 ) )
3 ovex 6047 . . . . . . 7  |-  ( B  mod  8 )  e. 
_V
43elpr 3777 . . . . . 6  |-  ( ( B  mod  8 )  e.  { 3 ,  5 }  <->  ( ( B  mod  8 )  =  3  \/  ( B  mod  8 )  =  5 ) )
52, 4anbi12i 679 . . . . 5  |-  ( ( ( A  mod  8
)  e.  { 3 ,  5 }  /\  ( B  mod  8
)  e.  { 3 ,  5 } )  <-> 
( ( ( A  mod  8 )  =  3  \/  ( A  mod  8 )  =  5 )  /\  (
( B  mod  8
)  =  3  \/  ( B  mod  8
)  =  5 ) ) )
6 simpll 731 . . . . . . . . 9  |-  ( ( ( A  e.  ZZ  /\  B  e.  ZZ )  /\  ( ( A  mod  8 )  =  3  /\  ( B  mod  8 )  =  3 ) )  ->  A  e.  ZZ )
7 3nn 10068 . . . . . . . . . . 11  |-  3  e.  NN
87nnzi 10239 . . . . . . . . . 10  |-  3  e.  ZZ
98a1i 11 . . . . . . . . 9  |-  ( ( ( A  e.  ZZ  /\  B  e.  ZZ )  /\  ( ( A  mod  8 )  =  3  /\  ( B  mod  8 )  =  3 ) )  -> 
3  e.  ZZ )
10 simplr 732 . . . . . . . . 9  |-  ( ( ( A  e.  ZZ  /\  B  e.  ZZ )  /\  ( ( A  mod  8 )  =  3  /\  ( B  mod  8 )  =  3 ) )  ->  B  e.  ZZ )
11 8re 10012 . . . . . . . . . . 11  |-  8  e.  RR
12 8pos 10024 . . . . . . . . . . 11  |-  0  <  8
1311, 12elrpii 10549 . . . . . . . . . 10  |-  8  e.  RR+
1413a1i 11 . . . . . . . . 9  |-  ( ( ( A  e.  ZZ  /\  B  e.  ZZ )  /\  ( ( A  mod  8 )  =  3  /\  ( B  mod  8 )  =  3 ) )  -> 
8  e.  RR+ )
15 simprl 733 . . . . . . . . . 10  |-  ( ( ( A  e.  ZZ  /\  B  e.  ZZ )  /\  ( ( A  mod  8 )  =  3  /\  ( B  mod  8 )  =  3 ) )  -> 
( A  mod  8
)  =  3 )
16 lgsdir2lem1 20976 . . . . . . . . . . . 12  |-  ( ( ( 1  mod  8
)  =  1  /\  ( -u 1  mod  8 )  =  7 )  /\  ( ( 3  mod  8 )  =  3  /\  ( -u 3  mod  8 )  =  5 ) )
1716simpri 449 . . . . . . . . . . 11  |-  ( ( 3  mod  8 )  =  3  /\  ( -u 3  mod  8 )  =  5 )
1817simpli 445 . . . . . . . . . 10  |-  ( 3  mod  8 )  =  3
1915, 18syl6eqr 2439 . . . . . . . . 9  |-  ( ( ( A  e.  ZZ  /\  B  e.  ZZ )  /\  ( ( A  mod  8 )  =  3  /\  ( B  mod  8 )  =  3 ) )  -> 
( A  mod  8
)  =  ( 3  mod  8 ) )
20 simprr 734 . . . . . . . . . 10  |-  ( ( ( A  e.  ZZ  /\  B  e.  ZZ )  /\  ( ( A  mod  8 )  =  3  /\  ( B  mod  8 )  =  3 ) )  -> 
( B  mod  8
)  =  3 )
2120, 18syl6eqr 2439 . . . . . . . . 9  |-  ( ( ( A  e.  ZZ  /\  B  e.  ZZ )  /\  ( ( A  mod  8 )  =  3  /\  ( B  mod  8 )  =  3 ) )  -> 
( B  mod  8
)  =  ( 3  mod  8 ) )
226, 9, 10, 9, 14, 19, 21modmul12d 11209 . . . . . . . 8  |-  ( ( ( A  e.  ZZ  /\  B  e.  ZZ )  /\  ( ( A  mod  8 )  =  3  /\  ( B  mod  8 )  =  3 ) )  -> 
( ( A  x.  B )  mod  8
)  =  ( ( 3  x.  3 )  mod  8 ) )
2322orcd 382 . . . . . . 7  |-  ( ( ( A  e.  ZZ  /\  B  e.  ZZ )  /\  ( ( A  mod  8 )  =  3  /\  ( B  mod  8 )  =  3 ) )  -> 
( ( ( A  x.  B )  mod  8 )  =  ( ( 3  x.  3 )  mod  8 )  \/  ( ( A  x.  B )  mod  8 )  =  (
-u ( 3  x.  3 )  mod  8
) ) )
2423ex 424 . . . . . 6  |-  ( ( A  e.  ZZ  /\  B  e.  ZZ )  ->  ( ( ( A  mod  8 )  =  3  /\  ( B  mod  8 )  =  3 )  ->  (
( ( A  x.  B )  mod  8
)  =  ( ( 3  x.  3 )  mod  8 )  \/  ( ( A  x.  B )  mod  8
)  =  ( -u ( 3  x.  3 )  mod  8 ) ) ) )
25 simpll 731 . . . . . . . . . 10  |-  ( ( ( A  e.  ZZ  /\  B  e.  ZZ )  /\  ( ( A  mod  8 )  =  5  /\  ( B  mod  8 )  =  3 ) )  ->  A  e.  ZZ )
26 znegcl 10247 . . . . . . . . . . 11  |-  ( 3  e.  ZZ  ->  -u 3  e.  ZZ )
278, 26mp1i 12 . . . . . . . . . 10  |-  ( ( ( A  e.  ZZ  /\  B  e.  ZZ )  /\  ( ( A  mod  8 )  =  5  /\  ( B  mod  8 )  =  3 ) )  ->  -u 3  e.  ZZ )
28 simplr 732 . . . . . . . . . 10  |-  ( ( ( A  e.  ZZ  /\  B  e.  ZZ )  /\  ( ( A  mod  8 )  =  5  /\  ( B  mod  8 )  =  3 ) )  ->  B  e.  ZZ )
298a1i 11 . . . . . . . . . 10  |-  ( ( ( A  e.  ZZ  /\  B  e.  ZZ )  /\  ( ( A  mod  8 )  =  5  /\  ( B  mod  8 )  =  3 ) )  -> 
3  e.  ZZ )
3013a1i 11 . . . . . . . . . 10  |-  ( ( ( A  e.  ZZ  /\  B  e.  ZZ )  /\  ( ( A  mod  8 )  =  5  /\  ( B  mod  8 )  =  3 ) )  -> 
8  e.  RR+ )
31 simprl 733 . . . . . . . . . . 11  |-  ( ( ( A  e.  ZZ  /\  B  e.  ZZ )  /\  ( ( A  mod  8 )  =  5  /\  ( B  mod  8 )  =  3 ) )  -> 
( A  mod  8
)  =  5 )
3217simpri 449 . . . . . . . . . . 11  |-  ( -u
3  mod  8 )  =  5
3331, 32syl6eqr 2439 . . . . . . . . . 10  |-  ( ( ( A  e.  ZZ  /\  B  e.  ZZ )  /\  ( ( A  mod  8 )  =  5  /\  ( B  mod  8 )  =  3 ) )  -> 
( A  mod  8
)  =  ( -u
3  mod  8 ) )
34 simprr 734 . . . . . . . . . . 11  |-  ( ( ( A  e.  ZZ  /\  B  e.  ZZ )  /\  ( ( A  mod  8 )  =  5  /\  ( B  mod  8 )  =  3 ) )  -> 
( B  mod  8
)  =  3 )
3534, 18syl6eqr 2439 . . . . . . . . . 10  |-  ( ( ( A  e.  ZZ  /\  B  e.  ZZ )  /\  ( ( A  mod  8 )  =  5  /\  ( B  mod  8 )  =  3 ) )  -> 
( B  mod  8
)  =  ( 3  mod  8 ) )
3625, 27, 28, 29, 30, 33, 35modmul12d 11209 . . . . . . . . 9  |-  ( ( ( A  e.  ZZ  /\  B  e.  ZZ )  /\  ( ( A  mod  8 )  =  5  /\  ( B  mod  8 )  =  3 ) )  -> 
( ( A  x.  B )  mod  8
)  =  ( (
-u 3  x.  3 )  mod  8 ) )
37 3cn 10006 . . . . . . . . . . 11  |-  3  e.  CC
3837, 37mulneg1i 9413 . . . . . . . . . 10  |-  ( -u
3  x.  3 )  =  -u ( 3  x.  3 )
3938oveq1i 6032 . . . . . . . . 9  |-  ( (
-u 3  x.  3 )  mod  8 )  =  ( -u (
3  x.  3 )  mod  8 )
4036, 39syl6eq 2437 . . . . . . . 8  |-  ( ( ( A  e.  ZZ  /\  B  e.  ZZ )  /\  ( ( A  mod  8 )  =  5  /\  ( B  mod  8 )  =  3 ) )  -> 
( ( A  x.  B )  mod  8
)  =  ( -u ( 3  x.  3 )  mod  8 ) )
4140olcd 383 . . . . . . 7  |-  ( ( ( A  e.  ZZ  /\  B  e.  ZZ )  /\  ( ( A  mod  8 )  =  5  /\  ( B  mod  8 )  =  3 ) )  -> 
( ( ( A  x.  B )  mod  8 )  =  ( ( 3  x.  3 )  mod  8 )  \/  ( ( A  x.  B )  mod  8 )  =  (
-u ( 3  x.  3 )  mod  8
) ) )
4241ex 424 . . . . . 6  |-  ( ( A  e.  ZZ  /\  B  e.  ZZ )  ->  ( ( ( A  mod  8 )  =  5  /\  ( B  mod  8 )  =  3 )  ->  (
( ( A  x.  B )  mod  8
)  =  ( ( 3  x.  3 )  mod  8 )  \/  ( ( A  x.  B )  mod  8
)  =  ( -u ( 3  x.  3 )  mod  8 ) ) ) )
43 simpll 731 . . . . . . . . . 10  |-  ( ( ( A  e.  ZZ  /\  B  e.  ZZ )  /\  ( ( A  mod  8 )  =  3  /\  ( B  mod  8 )  =  5 ) )  ->  A  e.  ZZ )
448a1i 11 . . . . . . . . . 10  |-  ( ( ( A  e.  ZZ  /\  B  e.  ZZ )  /\  ( ( A  mod  8 )  =  3  /\  ( B  mod  8 )  =  5 ) )  -> 
3  e.  ZZ )
45 simplr 732 . . . . . . . . . 10  |-  ( ( ( A  e.  ZZ  /\  B  e.  ZZ )  /\  ( ( A  mod  8 )  =  3  /\  ( B  mod  8 )  =  5 ) )  ->  B  e.  ZZ )
468, 26mp1i 12 . . . . . . . . . 10  |-  ( ( ( A  e.  ZZ  /\  B  e.  ZZ )  /\  ( ( A  mod  8 )  =  3  /\  ( B  mod  8 )  =  5 ) )  ->  -u 3  e.  ZZ )
4713a1i 11 . . . . . . . . . 10  |-  ( ( ( A  e.  ZZ  /\  B  e.  ZZ )  /\  ( ( A  mod  8 )  =  3  /\  ( B  mod  8 )  =  5 ) )  -> 
8  e.  RR+ )
48 simprl 733 . . . . . . . . . . 11  |-  ( ( ( A  e.  ZZ  /\  B  e.  ZZ )  /\  ( ( A  mod  8 )  =  3  /\  ( B  mod  8 )  =  5 ) )  -> 
( A  mod  8
)  =  3 )
4948, 18syl6eqr 2439 . . . . . . . . . 10  |-  ( ( ( A  e.  ZZ  /\  B  e.  ZZ )  /\  ( ( A  mod  8 )  =  3  /\  ( B  mod  8 )  =  5 ) )  -> 
( A  mod  8
)  =  ( 3  mod  8 ) )
50 simprr 734 . . . . . . . . . . 11  |-  ( ( ( A  e.  ZZ  /\  B  e.  ZZ )  /\  ( ( A  mod  8 )  =  3  /\  ( B  mod  8 )  =  5 ) )  -> 
( B  mod  8
)  =  5 )
5150, 32syl6eqr 2439 . . . . . . . . . 10  |-  ( ( ( A  e.  ZZ  /\  B  e.  ZZ )  /\  ( ( A  mod  8 )  =  3  /\  ( B  mod  8 )  =  5 ) )  -> 
( B  mod  8
)  =  ( -u
3  mod  8 ) )
5243, 44, 45, 46, 47, 49, 51modmul12d 11209 . . . . . . . . 9  |-  ( ( ( A  e.  ZZ  /\  B  e.  ZZ )  /\  ( ( A  mod  8 )  =  3  /\  ( B  mod  8 )  =  5 ) )  -> 
( ( A  x.  B )  mod  8
)  =  ( ( 3  x.  -u 3
)  mod  8 ) )
5337, 37mulneg2i 9414 . . . . . . . . . 10  |-  ( 3  x.  -u 3 )  = 
-u ( 3  x.  3 )
5453oveq1i 6032 . . . . . . . . 9  |-  ( ( 3  x.  -u 3
)  mod  8 )  =  ( -u (
3  x.  3 )  mod  8 )
5552, 54syl6eq 2437 . . . . . . . 8  |-  ( ( ( A  e.  ZZ  /\  B  e.  ZZ )  /\  ( ( A  mod  8 )  =  3  /\  ( B  mod  8 )  =  5 ) )  -> 
( ( A  x.  B )  mod  8
)  =  ( -u ( 3  x.  3 )  mod  8 ) )
5655olcd 383 . . . . . . 7  |-  ( ( ( A  e.  ZZ  /\  B  e.  ZZ )  /\  ( ( A  mod  8 )  =  3  /\  ( B  mod  8 )  =  5 ) )  -> 
( ( ( A  x.  B )  mod  8 )  =  ( ( 3  x.  3 )  mod  8 )  \/  ( ( A  x.  B )  mod  8 )  =  (
-u ( 3  x.  3 )  mod  8
) ) )
5756ex 424 . . . . . 6  |-  ( ( A  e.  ZZ  /\  B  e.  ZZ )  ->  ( ( ( A  mod  8 )  =  3  /\  ( B  mod  8 )  =  5 )  ->  (
( ( A  x.  B )  mod  8
)  =  ( ( 3  x.  3 )  mod  8 )  \/  ( ( A  x.  B )  mod  8
)  =  ( -u ( 3  x.  3 )  mod  8 ) ) ) )
58 simpll 731 . . . . . . . . . 10  |-  ( ( ( A  e.  ZZ  /\  B  e.  ZZ )  /\  ( ( A  mod  8 )  =  5  /\  ( B  mod  8 )  =  5 ) )  ->  A  e.  ZZ )
598, 26mp1i 12 . . . . . . . . . 10  |-  ( ( ( A  e.  ZZ  /\  B  e.  ZZ )  /\  ( ( A  mod  8 )  =  5  /\  ( B  mod  8 )  =  5 ) )  ->  -u 3  e.  ZZ )
60 simplr 732 . . . . . . . . . 10  |-  ( ( ( A  e.  ZZ  /\  B  e.  ZZ )  /\  ( ( A  mod  8 )  =  5  /\  ( B  mod  8 )  =  5 ) )  ->  B  e.  ZZ )
6113a1i 11 . . . . . . . . . 10  |-  ( ( ( A  e.  ZZ  /\  B  e.  ZZ )  /\  ( ( A  mod  8 )  =  5  /\  ( B  mod  8 )  =  5 ) )  -> 
8  e.  RR+ )
62 simprl 733 . . . . . . . . . . 11  |-  ( ( ( A  e.  ZZ  /\  B  e.  ZZ )  /\  ( ( A  mod  8 )  =  5  /\  ( B  mod  8 )  =  5 ) )  -> 
( A  mod  8
)  =  5 )
6362, 32syl6eqr 2439 . . . . . . . . . 10  |-  ( ( ( A  e.  ZZ  /\  B  e.  ZZ )  /\  ( ( A  mod  8 )  =  5  /\  ( B  mod  8 )  =  5 ) )  -> 
( A  mod  8
)  =  ( -u
3  mod  8 ) )
64 simprr 734 . . . . . . . . . . 11  |-  ( ( ( A  e.  ZZ  /\  B  e.  ZZ )  /\  ( ( A  mod  8 )  =  5  /\  ( B  mod  8 )  =  5 ) )  -> 
( B  mod  8
)  =  5 )
6564, 32syl6eqr 2439 . . . . . . . . . 10  |-  ( ( ( A  e.  ZZ  /\  B  e.  ZZ )  /\  ( ( A  mod  8 )  =  5  /\  ( B  mod  8 )  =  5 ) )  -> 
( B  mod  8
)  =  ( -u
3  mod  8 ) )
6658, 59, 60, 59, 61, 63, 65modmul12d 11209 . . . . . . . . 9  |-  ( ( ( A  e.  ZZ  /\  B  e.  ZZ )  /\  ( ( A  mod  8 )  =  5  /\  ( B  mod  8 )  =  5 ) )  -> 
( ( A  x.  B )  mod  8
)  =  ( (
-u 3  x.  -u 3
)  mod  8 ) )
6737, 37mul2negi 9415 . . . . . . . . . 10  |-  ( -u
3  x.  -u 3
)  =  ( 3  x.  3 )
6867oveq1i 6032 . . . . . . . . 9  |-  ( (
-u 3  x.  -u 3
)  mod  8 )  =  ( ( 3  x.  3 )  mod  8 )
6966, 68syl6eq 2437 . . . . . . . 8  |-  ( ( ( A  e.  ZZ  /\  B  e.  ZZ )  /\  ( ( A  mod  8 )  =  5  /\  ( B  mod  8 )  =  5 ) )  -> 
( ( A  x.  B )  mod  8
)  =  ( ( 3  x.  3 )  mod  8 ) )
7069orcd 382 . . . . . . 7  |-  ( ( ( A  e.  ZZ  /\  B  e.  ZZ )  /\  ( ( A  mod  8 )  =  5  /\  ( B  mod  8 )  =  5 ) )  -> 
( ( ( A  x.  B )  mod  8 )  =  ( ( 3  x.  3 )  mod  8 )  \/  ( ( A  x.  B )  mod  8 )  =  (
-u ( 3  x.  3 )  mod  8
) ) )
7170ex 424 . . . . . 6  |-  ( ( A  e.  ZZ  /\  B  e.  ZZ )  ->  ( ( ( A  mod  8 )  =  5  /\  ( B  mod  8 )  =  5 )  ->  (
( ( A  x.  B )  mod  8
)  =  ( ( 3  x.  3 )  mod  8 )  \/  ( ( A  x.  B )  mod  8
)  =  ( -u ( 3  x.  3 )  mod  8 ) ) ) )
7224, 42, 57, 71ccased 914 . . . . 5  |-  ( ( A  e.  ZZ  /\  B  e.  ZZ )  ->  ( ( ( ( A  mod  8 )  =  3  \/  ( A  mod  8 )  =  5 )  /\  (
( B  mod  8
)  =  3  \/  ( B  mod  8
)  =  5 ) )  ->  ( (
( A  x.  B
)  mod  8 )  =  ( ( 3  x.  3 )  mod  8 )  \/  (
( A  x.  B
)  mod  8 )  =  ( -u (
3  x.  3 )  mod  8 ) ) ) )
735, 72syl5bi 209 . . . 4  |-  ( ( A  e.  ZZ  /\  B  e.  ZZ )  ->  ( ( ( A  mod  8 )  e. 
{ 3 ,  5 }  /\  ( B  mod  8 )  e. 
{ 3 ,  5 } )  ->  (
( ( A  x.  B )  mod  8
)  =  ( ( 3  x.  3 )  mod  8 )  \/  ( ( A  x.  B )  mod  8
)  =  ( -u ( 3  x.  3 )  mod  8 ) ) ) )
7473imp 419 . . 3  |-  ( ( ( A  e.  ZZ  /\  B  e.  ZZ )  /\  ( ( A  mod  8 )  e. 
{ 3 ,  5 }  /\  ( B  mod  8 )  e. 
{ 3 ,  5 } ) )  -> 
( ( ( A  x.  B )  mod  8 )  =  ( ( 3  x.  3 )  mod  8 )  \/  ( ( A  x.  B )  mod  8 )  =  (
-u ( 3  x.  3 )  mod  8
) ) )
75 ovex 6047 . . . 4  |-  ( ( A  x.  B )  mod  8 )  e. 
_V
7675elpr 3777 . . 3  |-  ( ( ( A  x.  B
)  mod  8 )  e.  { ( ( 3  x.  3 )  mod  8 ) ,  ( -u ( 3  x.  3 )  mod  8 ) }  <->  ( (
( A  x.  B
)  mod  8 )  =  ( ( 3  x.  3 )  mod  8 )  \/  (
( A  x.  B
)  mod  8 )  =  ( -u (
3  x.  3 )  mod  8 ) ) )
7774, 76sylibr 204 . 2  |-  ( ( ( A  e.  ZZ  /\  B  e.  ZZ )  /\  ( ( A  mod  8 )  e. 
{ 3 ,  5 }  /\  ( B  mod  8 )  e. 
{ 3 ,  5 } ) )  -> 
( ( A  x.  B )  mod  8
)  e.  { ( ( 3  x.  3 )  mod  8 ) ,  ( -u (
3  x.  3 )  mod  8 ) } )
78 df-9 9999 . . . . . . . 8  |-  9  =  ( 8  +  1 )
7911recni 9037 . . . . . . . . 9  |-  8  e.  CC
80 ax-1cn 8983 . . . . . . . . 9  |-  1  e.  CC
8179, 80addcomi 9191 . . . . . . . 8  |-  ( 8  +  1 )  =  ( 1  +  8 )
8278, 81eqtri 2409 . . . . . . 7  |-  9  =  ( 1  +  8 )
83 3t3e9 10063 . . . . . . 7  |-  ( 3  x.  3 )  =  9
8479mulid2i 9028 . . . . . . . 8  |-  ( 1  x.  8 )  =  8
8584oveq2i 6033 . . . . . . 7  |-  ( 1  +  ( 1  x.  8 ) )  =  ( 1  +  8 )
8682, 83, 853eqtr4i 2419 . . . . . 6  |-  ( 3  x.  3 )  =  ( 1  +  ( 1  x.  8 ) )
8786oveq1i 6032 . . . . 5  |-  ( ( 3  x.  3 )  mod  8 )  =  ( ( 1  +  ( 1  x.  8 ) )  mod  8
)
88 1re 9025 . . . . . 6  |-  1  e.  RR
89 1z 10245 . . . . . 6  |-  1  e.  ZZ
90 modcyc 11205 . . . . . 6  |-  ( ( 1  e.  RR  /\  8  e.  RR+  /\  1  e.  ZZ )  ->  (
( 1  +  ( 1  x.  8 ) )  mod  8 )  =  ( 1  mod  8 ) )
9188, 13, 89, 90mp3an 1279 . . . . 5  |-  ( ( 1  +  ( 1  x.  8 ) )  mod  8 )  =  ( 1  mod  8
)
9287, 91eqtri 2409 . . . 4  |-  ( ( 3  x.  3 )  mod  8 )  =  ( 1  mod  8
)
9316simpli 445 . . . . 5  |-  ( ( 1  mod  8 )  =  1  /\  ( -u 1  mod  8 )  =  7 )
9493simpli 445 . . . 4  |-  ( 1  mod  8 )  =  1
9592, 94eqtri 2409 . . 3  |-  ( ( 3  x.  3 )  mod  8 )  =  1
96 znegcl 10247 . . . . . . . 8  |-  ( 1  e.  ZZ  ->  -u 1  e.  ZZ )
9789, 96mp1i 12 . . . . . . 7  |-  (  T. 
->  -u 1  e.  ZZ )
987, 7nnmulcli 9958 . . . . . . . . 9  |-  ( 3  x.  3 )  e.  NN
9998nnzi 10239 . . . . . . . 8  |-  ( 3  x.  3 )  e.  ZZ
10099a1i 11 . . . . . . 7  |-  (  T. 
->  ( 3  x.  3 )  e.  ZZ )
10189a1i 11 . . . . . . 7  |-  (  T. 
->  1  e.  ZZ )
10213a1i 11 . . . . . . 7  |-  (  T. 
->  8  e.  RR+ )
103 eqidd 2390 . . . . . . 7  |-  (  T. 
->  ( -u 1  mod  8 )  =  (
-u 1  mod  8
) )
10492a1i 11 . . . . . . 7  |-  (  T. 
->  ( ( 3  x.  3 )  mod  8
)  =  ( 1  mod  8 ) )
10597, 97, 100, 101, 102, 103, 104modmul12d 11209 . . . . . 6  |-  (  T. 
->  ( ( -u 1  x.  ( 3  x.  3 ) )  mod  8
)  =  ( (
-u 1  x.  1 )  mod  8 ) )
106105trud 1329 . . . . 5  |-  ( (
-u 1  x.  (
3  x.  3 ) )  mod  8 )  =  ( ( -u
1  x.  1 )  mod  8 )
10737, 37mulcli 9030 . . . . . . 7  |-  ( 3  x.  3 )  e.  CC
108107mulm1i 9412 . . . . . 6  |-  ( -u
1  x.  ( 3  x.  3 ) )  =  -u ( 3  x.  3 )
109108oveq1i 6032 . . . . 5  |-  ( (
-u 1  x.  (
3  x.  3 ) )  mod  8 )  =  ( -u (
3  x.  3 )  mod  8 )
11080mulm1i 9412 . . . . . 6  |-  ( -u
1  x.  1 )  =  -u 1
111110oveq1i 6032 . . . . 5  |-  ( (
-u 1  x.  1 )  mod  8 )  =  ( -u 1  mod  8 )
112106, 109, 1113eqtr3i 2417 . . . 4  |-  ( -u ( 3  x.  3 )  mod  8 )  =  ( -u 1  mod  8 )
11393simpri 449 . . . 4  |-  ( -u
1  mod  8 )  =  7
114112, 113eqtri 2409 . . 3  |-  ( -u ( 3  x.  3 )  mod  8 )  =  7
11595, 114preq12i 3833 . 2  |-  { ( ( 3  x.  3 )  mod  8 ) ,  ( -u (
3  x.  3 )  mod  8 ) }  =  { 1 ,  7 }
11677, 115syl6eleq 2479 1  |-  ( ( ( A  e.  ZZ  /\  B  e.  ZZ )  /\  ( ( A  mod  8 )  e. 
{ 3 ,  5 }  /\  ( B  mod  8 )  e. 
{ 3 ,  5 } ) )  -> 
( ( A  x.  B )  mod  8
)  e.  { 1 ,  7 } )
Colors of variables: wff set class
Syntax hints:    -> wi 4    \/ wo 358    /\ wa 359    T. wtru 1322    = wceq 1649    e. wcel 1717   {cpr 3760  (class class class)co 6022   RRcr 8924   1c1 8926    + caddc 8928    x. cmul 8930   -ucneg 9226   3c3 9984   5c5 9986   7c7 9988   8c8 9989   9c9 9990   ZZcz 10216   RR+crp 10546    mod cmo 11179
This theorem is referenced by:  lgsdir2  20981
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8  ax-gen 1552  ax-5 1563  ax-17 1623  ax-9 1661  ax-8 1682  ax-13 1719  ax-14 1721  ax-6 1736  ax-7 1741  ax-11 1753  ax-12 1939  ax-ext 2370  ax-sep 4273  ax-nul 4281  ax-pow 4320  ax-pr 4346  ax-un 4643  ax-cnex 8981  ax-resscn 8982  ax-1cn 8983  ax-icn 8984  ax-addcl 8985  ax-addrcl 8986  ax-mulcl 8987  ax-mulrcl 8988  ax-mulcom 8989  ax-addass 8990  ax-mulass 8991  ax-distr 8992  ax-i2m1 8993  ax-1ne0 8994  ax-1rid 8995  ax-rnegex 8996  ax-rrecex 8997  ax-cnre 8998  ax-pre-lttri 8999  ax-pre-lttrn 9000  ax-pre-ltadd 9001  ax-pre-mulgt0 9002  ax-pre-sup 9003
This theorem depends on definitions:  df-bi 178  df-or 360  df-an 361  df-3or 937  df-3an 938  df-tru 1325  df-ex 1548  df-nf 1551  df-sb 1656  df-eu 2244  df-mo 2245  df-clab 2376  df-cleq 2382  df-clel 2385  df-nfc 2514  df-ne 2554  df-nel 2555  df-ral 2656  df-rex 2657  df-reu 2658  df-rmo 2659  df-rab 2660  df-v 2903  df-sbc 3107  df-csb 3197  df-dif 3268  df-un 3270  df-in 3272  df-ss 3279  df-pss 3281  df-nul 3574  df-if 3685  df-pw 3746  df-sn 3765  df-pr 3766  df-tp 3767  df-op 3768  df-uni 3960  df-iun 4039  df-br 4156  df-opab 4210  df-mpt 4211  df-tr 4246  df-eprel 4437  df-id 4441  df-po 4446  df-so 4447  df-fr 4484  df-we 4486  df-ord 4527  df-on 4528  df-lim 4529  df-suc 4530  df-om 4788  df-xp 4826  df-rel 4827  df-cnv 4828  df-co 4829  df-dm 4830  df-rn 4831  df-res 4832  df-ima 4833  df-iota 5360  df-fun 5398  df-fn 5399  df-f 5400  df-f1 5401  df-fo 5402  df-f1o 5403  df-fv 5404  df-ov 6025  df-oprab 6026  df-mpt2 6027  df-riota 6487  df-recs 6571  df-rdg 6606  df-er 6843  df-en 7048  df-dom 7049  df-sdom 7050  df-sup 7383  df-pnf 9057  df-mnf 9058  df-xr 9059  df-ltxr 9060  df-le 9061  df-sub 9227  df-neg 9228  df-div 9612  df-nn 9935  df-2 9992  df-3 9993  df-4 9994  df-5 9995  df-6 9996  df-7 9997  df-8 9998  df-9 9999  df-n0 10156  df-z 10217  df-uz 10423  df-rp 10547  df-fl 11131  df-mod 11180
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