嗜好 - 颜人中

We present explicit infinite families of twisted torus knots that are not fibered. Our approach relies on an explicit formula for the Alexander polynomial derived in our previous work. We show that the leading coefficients of the Alexander polynomials of twisted torus knots can take arbitrary integer values, which immediately yields infinitely many examples of non-fibered twisted torus knots.

中国中部で、約90万年前の古人類の頭骨が発見された。先史時代にユーラシアの各地に居住していた旧人類の多様な系統樹の全貌がさらに詳細に示されると期待される。