reserve a,b,c,k,m,n for Nat;
reserve i,j for Integer;
reserve p for Prime;

theorem Th4:
  j <> 0 & i / j is integer implies j divides i
  proof
    assume
A1: j <> 0;
    assume i / j is integer;
    then reconsider z = i/j as Integer;
    take z;
    thus thesis by A1,XCMPLX_1:87;
  end;
