On the Alexander polynominals of alternating two-component links

Let L be an alternating two-component link with Alexander polynomial ”(x,y). Then the polynomials (1 ￠ ’x) ”(x,y) and (1 ￠ ’y) ”(x,y) are alternating. That is, (1 ￠ ’y) ”(x,y) can be written as ￠ ‘i,jcijxiyj in such a way that ( ￠ ’1)i+jcij ￠ ‰ ￥0.