On $\pi -\pi$ theorem for manifold pairs with boundaries

M. Cencelj, Yu. V. Muranov, D. Repovš

Surgery obstruction of a normal map to a simple Poincare pair $(X,Y)$ lies in the relative surgery obstruction group $L_{\ast }({\pi }_1(Y)\to {\pi }_1(X))$. A well known result of Wall, the so cal…