A note on semifree actions of 𝑆¹ on homotopy spheres
A note on semifree actions of 𝑆¹ on homotopy spheres
Introduction.Let (S1, 2B+2*, 2"), ¿2:2, denote a semifree differentiable action of S1 on homotopy (M + 2£)-sphere 2"+2* with the fixed point set the homotopy w-sphere 2", that is, Sl acts freely out-