reserve X for set, x,y,z for object,
  k,l,n for Nat,
  r for Real;
reserve i,i0,i1,i2,i3,i4,i5,i8,i9,j for Integer;
reserve r1,p,p1,g,g1,g2 for Real,
  Y for Subset of REAL;

theorem Th45:
  for r being Real st r <> 0 holds [\ r / r /] = 1
proof
  let r be Real;
  assume r <> 0;
  hence [\ r / r /] = [\ 1 /] by XCMPLX_1:60
    .= 1;
end;
