reserve x for set;
reserve i,j for Integer;
reserve n,n1,n2,n3 for Nat;
reserve K,K1,K2,K3 for Field;
reserve SK1,SK2 for Subfield of K;
reserve ek,ek1,ek2 for Element of K;
reserve p for Prime;
reserve a,b,c for Element of GF(p);
reserve F for FinSequence of GF(p);

theorem Th21:
  a |^ 0 = 1_GF(p) & a |^ 0 = 1
  proof
    thus A1: a |^ 0 = 1_GF(p) by BINOM:8;
    p > 1 by INT_2:def 4;
    hence a |^ 0 = 1 by A1,INT_3:14;
  end;
