A classical knot is a smooth embedding of S1 in S3. Recall here that S3 is R3 with a point added at infinity (for instance, by stereographic projection).
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Let bn = (−1)n√ n n−1 and cn = 1 n−1 . The series. Σcn diverges. For the series Σbn we use Dirichlet test to conclude that it is conditionally convergent ...