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Theorem lgslem1 16119
Description: When  a is coprime to the prime  p,  a ^ ( ( p  -  1 )  / 
2 ) is equivalent  mod  p to  1 or  -u 1, and so adding  1 makes it equivalent to  0 or  2. (Contributed by Mario Carneiro, 4-Feb-2015.)
Assertion
Ref Expression
lgslem1  |-  ( ( A  e.  ZZ  /\  P  e.  ( Prime  \  { 2 } )  /\  -.  P  ||  A )  ->  (
( ( A ^
( ( P  - 
1 )  /  2
) )  +  1 )  mod  P )  e.  { 0 ,  2 } )

Proof of Theorem lgslem1
StepHypRef Expression
1 eldifi 3351 . . . . . . . . 9  |-  ( P  e.  ( Prime  \  {
2 } )  ->  P  e.  Prime )
213ad2ant2 1050 . . . . . . . 8  |-  ( ( A  e.  ZZ  /\  P  e.  ( Prime  \  { 2 } )  /\  -.  P  ||  A )  ->  P  e.  Prime )
3 prmnn 12888 . . . . . . . 8  |-  ( P  e.  Prime  ->  P  e.  NN )
42, 3syl 14 . . . . . . 7  |-  ( ( A  e.  ZZ  /\  P  e.  ( Prime  \  { 2 } )  /\  -.  P  ||  A )  ->  P  e.  NN )
5 simp1 1028 . . . . . . 7  |-  ( ( A  e.  ZZ  /\  P  e.  ( Prime  \  { 2 } )  /\  -.  P  ||  A )  ->  A  e.  ZZ )
6 prmz 12889 . . . . . . . . . 10  |-  ( P  e.  Prime  ->  P  e.  ZZ )
72, 6syl 14 . . . . . . . . 9  |-  ( ( A  e.  ZZ  /\  P  e.  ( Prime  \  { 2 } )  /\  -.  P  ||  A )  ->  P  e.  ZZ )
85, 7gcdcomd 12751 . . . . . . . 8  |-  ( ( A  e.  ZZ  /\  P  e.  ( Prime  \  { 2 } )  /\  -.  P  ||  A )  ->  ( A  gcd  P )  =  ( P  gcd  A
) )
9 simp3 1030 . . . . . . . . 9  |-  ( ( A  e.  ZZ  /\  P  e.  ( Prime  \  { 2 } )  /\  -.  P  ||  A )  ->  -.  P  ||  A )
10 coprm 12922 . . . . . . . . . 10  |-  ( ( P  e.  Prime  /\  A  e.  ZZ )  ->  ( -.  P  ||  A  <->  ( P  gcd  A )  =  1 ) )
112, 5, 10syl2anc 415 . . . . . . . . 9  |-  ( ( A  e.  ZZ  /\  P  e.  ( Prime  \  { 2 } )  /\  -.  P  ||  A )  ->  ( -.  P  ||  A  <->  ( P  gcd  A )  =  1 ) )
129, 11mpbid 147 . . . . . . . 8  |-  ( ( A  e.  ZZ  /\  P  e.  ( Prime  \  { 2 } )  /\  -.  P  ||  A )  ->  ( P  gcd  A )  =  1 )
138, 12eqtrd 2271 . . . . . . 7  |-  ( ( A  e.  ZZ  /\  P  e.  ( Prime  \  { 2 } )  /\  -.  P  ||  A )  ->  ( A  gcd  P )  =  1 )
14 eulerth 13011 . . . . . . 7  |-  ( ( P  e.  NN  /\  A  e.  ZZ  /\  ( A  gcd  P )  =  1 )  ->  (
( A ^ ( phi `  P ) )  mod  P )  =  ( 1  mod  P
) )
154, 5, 13, 14syl3anc 1278 . . . . . 6  |-  ( ( A  e.  ZZ  /\  P  e.  ( Prime  \  { 2 } )  /\  -.  P  ||  A )  ->  (
( A ^ ( phi `  P ) )  mod  P )  =  ( 1  mod  P
) )
16 phiprm 13001 . . . . . . . . . 10  |-  ( P  e.  Prime  ->  ( phi `  P )  =  ( P  -  1 ) )
172, 16syl 14 . . . . . . . . 9  |-  ( ( A  e.  ZZ  /\  P  e.  ( Prime  \  { 2 } )  /\  -.  P  ||  A )  ->  ( phi `  P )  =  ( P  -  1 ) )
18 nnm1nn0 9604 . . . . . . . . . 10  |-  ( P  e.  NN  ->  ( P  -  1 )  e.  NN0 )
194, 18syl 14 . . . . . . . . 9  |-  ( ( A  e.  ZZ  /\  P  e.  ( Prime  \  { 2 } )  /\  -.  P  ||  A )  ->  ( P  -  1 )  e.  NN0 )
2017, 19eqeltrd 2315 . . . . . . . 8  |-  ( ( A  e.  ZZ  /\  P  e.  ( Prime  \  { 2 } )  /\  -.  P  ||  A )  ->  ( phi `  P )  e. 
NN0 )
21 zexpcl 10991 . . . . . . . 8  |-  ( ( A  e.  ZZ  /\  ( phi `  P )  e.  NN0 )  -> 
( A ^ ( phi `  P ) )  e.  ZZ )
225, 20, 21syl2anc 415 . . . . . . 7  |-  ( ( A  e.  ZZ  /\  P  e.  ( Prime  \  { 2 } )  /\  -.  P  ||  A )  ->  ( A ^ ( phi `  P ) )  e.  ZZ )
23 1zzd 9671 . . . . . . 7  |-  ( ( A  e.  ZZ  /\  P  e.  ( Prime  \  { 2 } )  /\  -.  P  ||  A )  ->  1  e.  ZZ )
24 moddvds 12566 . . . . . . 7  |-  ( ( P  e.  NN  /\  ( A ^ ( phi `  P ) )  e.  ZZ  /\  1  e.  ZZ )  ->  (
( ( A ^
( phi `  P
) )  mod  P
)  =  ( 1  mod  P )  <->  P  ||  (
( A ^ ( phi `  P ) )  -  1 ) ) )
254, 22, 23, 24syl3anc 1278 . . . . . 6  |-  ( ( A  e.  ZZ  /\  P  e.  ( Prime  \  { 2 } )  /\  -.  P  ||  A )  ->  (
( ( A ^
( phi `  P
) )  mod  P
)  =  ( 1  mod  P )  <->  P  ||  (
( A ^ ( phi `  P ) )  -  1 ) ) )
2615, 25mpbid 147 . . . . 5  |-  ( ( A  e.  ZZ  /\  P  e.  ( Prime  \  { 2 } )  /\  -.  P  ||  A )  ->  P  ||  ( ( A ^
( phi `  P
) )  -  1 ) )
2719nn0cnd 9622 . . . . . . . . . . . 12  |-  ( ( A  e.  ZZ  /\  P  e.  ( Prime  \  { 2 } )  /\  -.  P  ||  A )  ->  ( P  -  1 )  e.  CC )
28 2cnd 9377 . . . . . . . . . . . 12  |-  ( ( A  e.  ZZ  /\  P  e.  ( Prime  \  { 2 } )  /\  -.  P  ||  A )  ->  2  e.  CC )
29 2ap0 9397 . . . . . . . . . . . . 13  |-  2 #  0
3029a1i 9 . . . . . . . . . . . 12  |-  ( ( A  e.  ZZ  /\  P  e.  ( Prime  \  { 2 } )  /\  -.  P  ||  A )  ->  2 #  0 )
3127, 28, 30divcanap1d 9121 . . . . . . . . . . 11  |-  ( ( A  e.  ZZ  /\  P  e.  ( Prime  \  { 2 } )  /\  -.  P  ||  A )  ->  (
( ( P  - 
1 )  /  2
)  x.  2 )  =  ( P  - 
1 ) )
3217, 31eqtr4d 2274 . . . . . . . . . 10  |-  ( ( A  e.  ZZ  /\  P  e.  ( Prime  \  { 2 } )  /\  -.  P  ||  A )  ->  ( phi `  P )  =  ( ( ( P  -  1 )  / 
2 )  x.  2 ) )
3332oveq2d 6101 . . . . . . . . 9  |-  ( ( A  e.  ZZ  /\  P  e.  ( Prime  \  { 2 } )  /\  -.  P  ||  A )  ->  ( A ^ ( phi `  P ) )  =  ( A ^ (
( ( P  - 
1 )  /  2
)  x.  2 ) ) )
345zcnd 9769 . . . . . . . . . 10  |-  ( ( A  e.  ZZ  /\  P  e.  ( Prime  \  { 2 } )  /\  -.  P  ||  A )  ->  A  e.  CC )
35 2nn0 9580 . . . . . . . . . . 11  |-  2  e.  NN0
3635a1i 9 . . . . . . . . . 10  |-  ( ( A  e.  ZZ  /\  P  e.  ( Prime  \  { 2 } )  /\  -.  P  ||  A )  ->  2  e.  NN0 )
37 oddprm 13038 . . . . . . . . . . . 12  |-  ( P  e.  ( Prime  \  {
2 } )  -> 
( ( P  - 
1 )  /  2
)  e.  NN )
38373ad2ant2 1050 . . . . . . . . . . 11  |-  ( ( A  e.  ZZ  /\  P  e.  ( Prime  \  { 2 } )  /\  -.  P  ||  A )  ->  (
( P  -  1 )  /  2 )  e.  NN )
3938nnnn0d 9620 . . . . . . . . . 10  |-  ( ( A  e.  ZZ  /\  P  e.  ( Prime  \  { 2 } )  /\  -.  P  ||  A )  ->  (
( P  -  1 )  /  2 )  e.  NN0 )
4034, 36, 39expmuld 11114 . . . . . . . . 9  |-  ( ( A  e.  ZZ  /\  P  e.  ( Prime  \  { 2 } )  /\  -.  P  ||  A )  ->  ( A ^ ( ( ( P  -  1 )  /  2 )  x.  2 ) )  =  ( ( A ^
( ( P  - 
1 )  /  2
) ) ^ 2 ) )
4133, 40eqtrd 2271 . . . . . . . 8  |-  ( ( A  e.  ZZ  /\  P  e.  ( Prime  \  { 2 } )  /\  -.  P  ||  A )  ->  ( A ^ ( phi `  P ) )  =  ( ( A ^
( ( P  - 
1 )  /  2
) ) ^ 2 ) )
4241oveq1d 6100 . . . . . . 7  |-  ( ( A  e.  ZZ  /\  P  e.  ( Prime  \  { 2 } )  /\  -.  P  ||  A )  ->  (
( A ^ ( phi `  P ) )  -  1 )  =  ( ( ( A ^ ( ( P  -  1 )  / 
2 ) ) ^
2 )  -  1 ) )
43 sq1 11070 . . . . . . . 8  |-  ( 1 ^ 2 )  =  1
4443oveq2i 6096 . . . . . . 7  |-  ( ( ( A ^ (
( P  -  1 )  /  2 ) ) ^ 2 )  -  ( 1 ^ 2 ) )  =  ( ( ( A ^ ( ( P  -  1 )  / 
2 ) ) ^
2 )  -  1 )
4542, 44eqtr4di 2289 . . . . . 6  |-  ( ( A  e.  ZZ  /\  P  e.  ( Prime  \  { 2 } )  /\  -.  P  ||  A )  ->  (
( A ^ ( phi `  P ) )  -  1 )  =  ( ( ( A ^ ( ( P  -  1 )  / 
2 ) ) ^
2 )  -  (
1 ^ 2 ) ) )
46 zexpcl 10991 . . . . . . . . 9  |-  ( ( A  e.  ZZ  /\  ( ( P  - 
1 )  /  2
)  e.  NN0 )  ->  ( A ^ (
( P  -  1 )  /  2 ) )  e.  ZZ )
475, 39, 46syl2anc 415 . . . . . . . 8  |-  ( ( A  e.  ZZ  /\  P  e.  ( Prime  \  { 2 } )  /\  -.  P  ||  A )  ->  ( A ^ ( ( P  -  1 )  / 
2 ) )  e.  ZZ )
4847zcnd 9769 . . . . . . 7  |-  ( ( A  e.  ZZ  /\  P  e.  ( Prime  \  { 2 } )  /\  -.  P  ||  A )  ->  ( A ^ ( ( P  -  1 )  / 
2 ) )  e.  CC )
49 ax-1cn 8272 . . . . . . 7  |-  1  e.  CC
50 subsq 11083 . . . . . . 7  |-  ( ( ( A ^ (
( P  -  1 )  /  2 ) )  e.  CC  /\  1  e.  CC )  ->  ( ( ( A ^ ( ( P  -  1 )  / 
2 ) ) ^
2 )  -  (
1 ^ 2 ) )  =  ( ( ( A ^ (
( P  -  1 )  /  2 ) )  +  1 )  x.  ( ( A ^ ( ( P  -  1 )  / 
2 ) )  - 
1 ) ) )
5148, 49, 50sylancl 417 . . . . . 6  |-  ( ( A  e.  ZZ  /\  P  e.  ( Prime  \  { 2 } )  /\  -.  P  ||  A )  ->  (
( ( A ^
( ( P  - 
1 )  /  2
) ) ^ 2 )  -  ( 1 ^ 2 ) )  =  ( ( ( A ^ ( ( P  -  1 )  /  2 ) )  +  1 )  x.  ( ( A ^
( ( P  - 
1 )  /  2
) )  -  1 ) ) )
5245, 51eqtrd 2271 . . . . 5  |-  ( ( A  e.  ZZ  /\  P  e.  ( Prime  \  { 2 } )  /\  -.  P  ||  A )  ->  (
( A ^ ( phi `  P ) )  -  1 )  =  ( ( ( A ^ ( ( P  -  1 )  / 
2 ) )  +  1 )  x.  (
( A ^ (
( P  -  1 )  /  2 ) )  -  1 ) ) )
5326, 52breqtrd 4156 . . . 4  |-  ( ( A  e.  ZZ  /\  P  e.  ( Prime  \  { 2 } )  /\  -.  P  ||  A )  ->  P  ||  ( ( ( A ^ ( ( P  -  1 )  / 
2 ) )  +  1 )  x.  (
( A ^ (
( P  -  1 )  /  2 ) )  -  1 ) ) )
5447peano2zd 9771 . . . . 5  |-  ( ( A  e.  ZZ  /\  P  e.  ( Prime  \  { 2 } )  /\  -.  P  ||  A )  ->  (
( A ^ (
( P  -  1 )  /  2 ) )  +  1 )  e.  ZZ )
55 peano2zm 9682 . . . . . 6  |-  ( ( A ^ ( ( P  -  1 )  /  2 ) )  e.  ZZ  ->  (
( A ^ (
( P  -  1 )  /  2 ) )  -  1 )  e.  ZZ )
5647, 55syl 14 . . . . 5  |-  ( ( A  e.  ZZ  /\  P  e.  ( Prime  \  { 2 } )  /\  -.  P  ||  A )  ->  (
( A ^ (
( P  -  1 )  /  2 ) )  -  1 )  e.  ZZ )
57 euclemma 12924 . . . . 5  |-  ( ( P  e.  Prime  /\  (
( A ^ (
( P  -  1 )  /  2 ) )  +  1 )  e.  ZZ  /\  (
( A ^ (
( P  -  1 )  /  2 ) )  -  1 )  e.  ZZ )  -> 
( P  ||  (
( ( A ^
( ( P  - 
1 )  /  2
) )  +  1 )  x.  ( ( A ^ ( ( P  -  1 )  /  2 ) )  -  1 ) )  <-> 
( P  ||  (
( A ^ (
( P  -  1 )  /  2 ) )  +  1 )  \/  P  ||  (
( A ^ (
( P  -  1 )  /  2 ) )  -  1 ) ) ) )
582, 54, 56, 57syl3anc 1278 . . . 4  |-  ( ( A  e.  ZZ  /\  P  e.  ( Prime  \  { 2 } )  /\  -.  P  ||  A )  ->  ( P  ||  ( ( ( A ^ ( ( P  -  1 )  /  2 ) )  +  1 )  x.  ( ( A ^
( ( P  - 
1 )  /  2
) )  -  1 ) )  <->  ( P  ||  ( ( A ^
( ( P  - 
1 )  /  2
) )  +  1 )  \/  P  ||  ( ( A ^
( ( P  - 
1 )  /  2
) )  -  1 ) ) ) )
5953, 58mpbid 147 . . 3  |-  ( ( A  e.  ZZ  /\  P  e.  ( Prime  \  { 2 } )  /\  -.  P  ||  A )  ->  ( P  ||  ( ( A ^ ( ( P  -  1 )  / 
2 ) )  +  1 )  \/  P  ||  ( ( A ^
( ( P  - 
1 )  /  2
) )  -  1 ) ) )
60 dvdsval3 12558 . . . . 5  |-  ( ( P  e.  NN  /\  ( ( A ^
( ( P  - 
1 )  /  2
) )  +  1 )  e.  ZZ )  ->  ( P  ||  ( ( A ^
( ( P  - 
1 )  /  2
) )  +  1 )  <->  ( ( ( A ^ ( ( P  -  1 )  /  2 ) )  +  1 )  mod 
P )  =  0 ) )
614, 54, 60syl2anc 415 . . . 4  |-  ( ( A  e.  ZZ  /\  P  e.  ( Prime  \  { 2 } )  /\  -.  P  ||  A )  ->  ( P  ||  ( ( A ^ ( ( P  -  1 )  / 
2 ) )  +  1 )  <->  ( (
( A ^ (
( P  -  1 )  /  2 ) )  +  1 )  mod  P )  =  0 ) )
62 2z 9672 . . . . . . 7  |-  2  e.  ZZ
6362a1i 9 . . . . . 6  |-  ( ( A  e.  ZZ  /\  P  e.  ( Prime  \  { 2 } )  /\  -.  P  ||  A )  ->  2  e.  ZZ )
64 moddvds 12566 . . . . . 6  |-  ( ( P  e.  NN  /\  ( ( A ^
( ( P  - 
1 )  /  2
) )  +  1 )  e.  ZZ  /\  2  e.  ZZ )  ->  ( ( ( ( A ^ ( ( P  -  1 )  /  2 ) )  +  1 )  mod 
P )  =  ( 2  mod  P )  <-> 
P  ||  ( (
( A ^ (
( P  -  1 )  /  2 ) )  +  1 )  -  2 ) ) )
654, 54, 63, 64syl3anc 1278 . . . . 5  |-  ( ( A  e.  ZZ  /\  P  e.  ( Prime  \  { 2 } )  /\  -.  P  ||  A )  ->  (
( ( ( A ^ ( ( P  -  1 )  / 
2 ) )  +  1 )  mod  P
)  =  ( 2  mod  P )  <->  P  ||  (
( ( A ^
( ( P  - 
1 )  /  2
) )  +  1 )  -  2 ) ) )
66 zq 10026 . . . . . . . 8  |-  ( 2  e.  ZZ  ->  2  e.  QQ )
6762, 66mp1i 10 . . . . . . 7  |-  ( ( A  e.  ZZ  /\  P  e.  ( Prime  \  { 2 } )  /\  -.  P  ||  A )  ->  2  e.  QQ )
68 zq 10026 . . . . . . . 8  |-  ( P  e.  ZZ  ->  P  e.  QQ )
697, 68syl 14 . . . . . . 7  |-  ( ( A  e.  ZZ  /\  P  e.  ( Prime  \  { 2 } )  /\  -.  P  ||  A )  ->  P  e.  QQ )
70 0le2 9394 . . . . . . . 8  |-  0  <_  2
7170a1i 9 . . . . . . 7  |-  ( ( A  e.  ZZ  /\  P  e.  ( Prime  \  { 2 } )  /\  -.  P  ||  A )  ->  0  <_  2 )
72 eldifsni 3843 . . . . . . . . . 10  |-  ( P  e.  ( Prime  \  {
2 } )  ->  P  =/=  2 )
73723ad2ant2 1050 . . . . . . . . 9  |-  ( ( A  e.  ZZ  /\  P  e.  ( Prime  \  { 2 } )  /\  -.  P  ||  A )  ->  P  =/=  2 )
74 zapne 9719 . . . . . . . . . 10  |-  ( ( P  e.  ZZ  /\  2  e.  ZZ )  ->  ( P #  2  <->  P  =/=  2 ) )
757, 62, 74sylancl 417 . . . . . . . . 9  |-  ( ( A  e.  ZZ  /\  P  e.  ( Prime  \  { 2 } )  /\  -.  P  ||  A )  ->  ( P #  2  <->  P  =/=  2
) )
7673, 75mpbird 167 . . . . . . . 8  |-  ( ( A  e.  ZZ  /\  P  e.  ( Prime  \  { 2 } )  /\  -.  P  ||  A )  ->  P #  2 )
77 2re 9374 . . . . . . . . . 10  |-  2  e.  RR
7877a1i 9 . . . . . . . . 9  |-  ( ( A  e.  ZZ  /\  P  e.  ( Prime  \  { 2 } )  /\  -.  P  ||  A )  ->  2  e.  RR )
794nnred 9317 . . . . . . . . 9  |-  ( ( A  e.  ZZ  /\  P  e.  ( Prime  \  { 2 } )  /\  -.  P  ||  A )  ->  P  e.  RR )
80 prmuz2 12909 . . . . . . . . . . 11  |-  ( P  e.  Prime  ->  P  e.  ( ZZ>= `  2 )
)
812, 80syl 14 . . . . . . . . . 10  |-  ( ( A  e.  ZZ  /\  P  e.  ( Prime  \  { 2 } )  /\  -.  P  ||  A )  ->  P  e.  ( ZZ>= `  2 )
)
82 eluzle 9934 . . . . . . . . . 10  |-  ( P  e.  ( ZZ>= `  2
)  ->  2  <_  P )
8381, 82syl 14 . . . . . . . . 9  |-  ( ( A  e.  ZZ  /\  P  e.  ( Prime  \  { 2 } )  /\  -.  P  ||  A )  ->  2  <_  P )
8478, 79, 83leltapd 8967 . . . . . . . 8  |-  ( ( A  e.  ZZ  /\  P  e.  ( Prime  \  { 2 } )  /\  -.  P  ||  A )  ->  (
2  <  P  <->  P #  2
) )
8576, 84mpbird 167 . . . . . . 7  |-  ( ( A  e.  ZZ  /\  P  e.  ( Prime  \  { 2 } )  /\  -.  P  ||  A )  ->  2  <  P )
86 modqid 10786 . . . . . . 7  |-  ( ( ( 2  e.  QQ  /\  P  e.  QQ )  /\  ( 0  <_ 
2  /\  2  <  P ) )  ->  (
2  mod  P )  =  2 )
8767, 69, 71, 85, 86syl22anc 1279 . . . . . 6  |-  ( ( A  e.  ZZ  /\  P  e.  ( Prime  \  { 2 } )  /\  -.  P  ||  A )  ->  (
2  mod  P )  =  2 )
8887eqeq2d 2250 . . . . 5  |-  ( ( A  e.  ZZ  /\  P  e.  ( Prime  \  { 2 } )  /\  -.  P  ||  A )  ->  (
( ( ( A ^ ( ( P  -  1 )  / 
2 ) )  +  1 )  mod  P
)  =  ( 2  mod  P )  <->  ( (
( A ^ (
( P  -  1 )  /  2 ) )  +  1 )  mod  P )  =  2 ) )
89 df-2 9363 . . . . . . . 8  |-  2  =  ( 1  +  1 )
9089oveq2i 6096 . . . . . . 7  |-  ( ( ( A ^ (
( P  -  1 )  /  2 ) )  +  1 )  -  2 )  =  ( ( ( A ^ ( ( P  -  1 )  / 
2 ) )  +  1 )  -  (
1  +  1 ) )
9149a1i 9 . . . . . . . 8  |-  ( ( A  e.  ZZ  /\  P  e.  ( Prime  \  { 2 } )  /\  -.  P  ||  A )  ->  1  e.  CC )
9248, 91, 91pnpcan2d 8675 . . . . . . 7  |-  ( ( A  e.  ZZ  /\  P  e.  ( Prime  \  { 2 } )  /\  -.  P  ||  A )  ->  (
( ( A ^
( ( P  - 
1 )  /  2
) )  +  1 )  -  ( 1  +  1 ) )  =  ( ( A ^ ( ( P  -  1 )  / 
2 ) )  - 
1 ) )
9390, 92eqtrid 2283 . . . . . 6  |-  ( ( A  e.  ZZ  /\  P  e.  ( Prime  \  { 2 } )  /\  -.  P  ||  A )  ->  (
( ( A ^
( ( P  - 
1 )  /  2
) )  +  1 )  -  2 )  =  ( ( A ^ ( ( P  -  1 )  / 
2 ) )  - 
1 ) )
9493breq2d 4142 . . . . 5  |-  ( ( A  e.  ZZ  /\  P  e.  ( Prime  \  { 2 } )  /\  -.  P  ||  A )  ->  ( P  ||  ( ( ( A ^ ( ( P  -  1 )  /  2 ) )  +  1 )  - 
2 )  <->  P  ||  (
( A ^ (
( P  -  1 )  /  2 ) )  -  1 ) ) )
9565, 88, 943bitr3rd 219 . . . 4  |-  ( ( A  e.  ZZ  /\  P  e.  ( Prime  \  { 2 } )  /\  -.  P  ||  A )  ->  ( P  ||  ( ( A ^ ( ( P  -  1 )  / 
2 ) )  - 
1 )  <->  ( (
( A ^ (
( P  -  1 )  /  2 ) )  +  1 )  mod  P )  =  2 ) )
9661, 95orbi12d 805 . . 3  |-  ( ( A  e.  ZZ  /\  P  e.  ( Prime  \  { 2 } )  /\  -.  P  ||  A )  ->  (
( P  ||  (
( A ^ (
( P  -  1 )  /  2 ) )  +  1 )  \/  P  ||  (
( A ^ (
( P  -  1 )  /  2 ) )  -  1 ) )  <->  ( ( ( ( A ^ (
( P  -  1 )  /  2 ) )  +  1 )  mod  P )  =  0  \/  ( ( ( A ^ (
( P  -  1 )  /  2 ) )  +  1 )  mod  P )  =  2 ) ) )
9759, 96mpbid 147 . 2  |-  ( ( A  e.  ZZ  /\  P  e.  ( Prime  \  { 2 } )  /\  -.  P  ||  A )  ->  (
( ( ( A ^ ( ( P  -  1 )  / 
2 ) )  +  1 )  mod  P
)  =  0  \/  ( ( ( A ^ ( ( P  -  1 )  / 
2 ) )  +  1 )  mod  P
)  =  2 ) )
9854, 4zmodcld 10782 . . 3  |-  ( ( A  e.  ZZ  /\  P  e.  ( Prime  \  { 2 } )  /\  -.  P  ||  A )  ->  (
( ( A ^
( ( P  - 
1 )  /  2
) )  +  1 )  mod  P )  e.  NN0 )
99 elprg 3729 . . 3  |-  ( ( ( ( A ^
( ( P  - 
1 )  /  2
) )  +  1 )  mod  P )  e.  NN0  ->  ( ( ( ( A ^
( ( P  - 
1 )  /  2
) )  +  1 )  mod  P )  e.  { 0 ,  2 }  <->  ( (
( ( A ^
( ( P  - 
1 )  /  2
) )  +  1 )  mod  P )  =  0  \/  (
( ( A ^
( ( P  - 
1 )  /  2
) )  +  1 )  mod  P )  =  2 ) ) )
10098, 99syl 14 . 2  |-  ( ( A  e.  ZZ  /\  P  e.  ( Prime  \  { 2 } )  /\  -.  P  ||  A )  ->  (
( ( ( A ^ ( ( P  -  1 )  / 
2 ) )  +  1 )  mod  P
)  e.  { 0 ,  2 }  <->  ( (
( ( A ^
( ( P  - 
1 )  /  2
) )  +  1 )  mod  P )  =  0  \/  (
( ( A ^
( ( P  - 
1 )  /  2
) )  +  1 )  mod  P )  =  2 ) ) )
10197, 100mpbird 167 1  |-  ( ( A  e.  ZZ  /\  P  e.  ( Prime  \  { 2 } )  /\  -.  P  ||  A )  ->  (
( ( A ^
( ( P  - 
1 )  /  2
) )  +  1 )  mod  P )  e.  { 0 ,  2 } )
Colors of variables:    wff set class
This proof depends on syntax axioms:   -. wn 3    -> wi 4    <-> wb 105    \/ wo 720    /\ w3a 1009    = wceq 1402    e. wcel 2209    =/= wne 2420    \ cdif 3217   {csn 3709   {cpr 3710   class class class wbr 4130   ` cfv 5377  (class class class)co 6085   CCcc 8177   RRcr 8178   0cc0 8179   1c1 8180    + caddc 8182    x. cmul 8184    < clt 8360    <_ cle 8361    - cmin 8497   # cap 8909    / cdiv 9002   NNcn 9304   2c2 9355   NN0cn0 9563   ZZcz 9644   ZZ>=cuz 9921   QQcq 10019    mod cmo 10759   ^cexp 10975    || cdvds 12554    gcd cgcd 12730   Primecprime 12885   phicphi 12987
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-in1 623  ax-in2 624  ax-io 721  ax-5 1500  ax-7 1501  ax-gen 1502  ax-ie1 1546  ax-ie2 1547  ax-8 1557  ax-10 1558  ax-11 1559  ax-i12 1560  ax-bndl 1562  ax-4 1563  ax-17 1579  ax-i9 1583  ax-ial 1587  ax-i5r 1588  ax-14 2212  ax-ext 2220  ax-coll 4246  ax-sep 4249  ax-nul 4259  ax-pow 4311  ax-pr 4346  ax-un 4578  ax-setind 4684  ax-iinf 4735  ax-cnex 8270  ax-resscn 8271  ax-1cn 8272  ax-1re 8273  ax-icn 8274  ax-addcl 8275  ax-addrcl 8276  ax-mulcl 8277  ax-mulrcl 8278  ax-addcom 8279  ax-mulcom 8280  ax-addass 8281  ax-mulass 8282  ax-distr 8283  ax-i2m1 8284  ax-0lt1 8285  ax-1rid 8286  ax-0id 8287  ax-rnegex 8288  ax-precex 8289  ax-cnre 8290  ax-pre-ltirr 8291  ax-pre-ltwlin 8292  ax-pre-lttrn 8293  ax-pre-apti 8294  ax-pre-ltadd 8295  ax-pre-mulgt0 8296  ax-pre-mulext 8297  ax-arch 8298  ax-caucvg 8299
This proof depends on definitions:  df-bi 117  df-stab 843  df-dc 847  df-3or 1010  df-3an 1011  df-tru 1405  df-fal 1408  df-xor 1425  df-nf 1514  df-sb 1816  df-eu 2089  df-mo 2090  df-clab 2225  df-cleq 2231  df-clel 2234  df-nfc 2381  df-ne 2421  df-nel 2516  df-ral 2533  df-rex 2534  df-reu 2535  df-rmo 2536  df-rab 2537  df-v 2823  df-sbc 3052  df-csb 3148  df-dif 3222  df-un 3224  df-in 3226  df-ss 3233  df-nul 3521  df-if 3639  df-pw 3690  df-sn 3715  df-pr 3716  df-op 3718  df-uni 3936  df-int 3971  df-iun 4014  df-br 4131  df-opab 4193  df-mpt 4194  df-tr 4230  df-id 4438  df-po 4441  df-iso 4442  df-iord 4511  df-on 4513  df-ilim 4514  df-suc 4516  df-iom 4738  df-xp 4780  df-rel 4781  df-cnv 4782  df-co 4783  df-dm 4784  df-rn 4785  df-res 4786  df-ima 4787  df-iota 5337  df-fun 5379  df-fn 5380  df-f 5381  df-f1 5382  df-fo 5383  df-f1o 5384  df-fv 5385  df-isom 5386  df-riota 6038  df-ov 6088  df-oprab 6089  df-mpo 6090  df-1st 6374  df-2nd 6375  df-recs 6576  df-irdg 6641  df-frec 6662  df-1o 6687  df-2o 6688  df-oadd 6691  df-er 6807  df-en 7023  df-dom 7024  df-fin 7025  df-sup 7324  df-pnf 8362  df-mnf 8363  df-xr 8364  df-ltxr 8365  df-le 8366  df-sub 8499  df-neg 8500  df-reap 8903  df-ap 8910  df-div 9003  df-inn 9305  df-2 9363  df-3 9364  df-4 9365  df-n0 9564  df-z 9645  df-uz 9922  df-q 10020  df-rp 10055  df-fz 10412  df-fzo 10550  df-fl 10705  df-mod 10760  df-seqfrec 10885  df-exp 10976  df-ihash 11215  df-cj 11607  df-re 11608  df-im 11609  df-rsqrt 11764  df-abs 11765  df-clim 12045  df-proddc 12318  df-dvds 12555  df-gcd 12731  df-prm 12886  df-phi 12989
This theorem is used by:  lgslem4  16122
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