Free coverings and modules of boundary links
Free coverings and modules of boundary links
Let $L = \{ {K_1}, \ldots ,{K_m}\}$ be a boundary link of $n$-spheres in ${S^{n + 2}}$, where $n \geqslant 3$, and let $X$ be the complement of $L$. Although most of the classical link invariants come from the homology of the universal abelian cover $\tilde X$ of $X$, with …