2. Prove that for any prime p, (p - 1)! + 1 is divisible by p. (Wilson’s Theorem)
3. Prove that each element of the Galois field GF(2^n), n = 1, 2,… with even elements is a perfect square.
4. Let a prime p == 2 (mod 3). Prove that each element of the Galois field GF(p) is a perfect cube.
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