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math.GT2001
Signatures of covering links
Jae Choon Cha, Ki Hyoung Ko
The theory of signature invariants of links in rational homology spheres is applied to covering links of homology boundary links. From patterns and Seifert matrices of homology bou…
math.GT2001
Signatures of links in rational homology spheres
Jae Choon Cha, Ki Hyoung Ko
A theory of signatures for odd-dimensional links in rational homology spheres is studied via their generalized Seifert surfaces. The jump functions of signatures are shown invarian…
math.GT2001
Positive presentations of the braid groups and the embedding problem
Jae Woo Han, Ki Hyoung Ko
A large class of positive finite presentations of the braid groups is found and studied. It is shown that no presentations but known exceptions in this class have the property that…