Hey, I was just wondering gif someone could help me prove the following.

((p-1)/2)!)^ 2=(+ or -) 1 mod (p), where p is prime.

THanks

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- December 10th 2010, 11:07 PMHelloWorld2Proof involving Wilson's theorem.
Hey, I was just wondering gif someone could help me prove the following.

((p-1)/2)!)^ 2=(+ or -) 1 mod (p), where p is prime.

THanks - December 11th 2010, 03:39 AMtonio
- December 11th 2010, 10:04 AMHelloWorld2
well, we'll get 1 when p=1mod(4), and -1 when p=-1mod(4). I realy don't get how you got that equaility.

- December 11th 2010, 11:55 AMtonio
- December 11th 2010, 03:53 PMmelese
- December 11th 2010, 07:30 PMtonio