摘要
It is proved that Kq(h)=K0(h) for every h in some class of quasisymmetric mappings of the unit circle with substantial points, where Kq(h):=sup{M(h(Q))/M(Q); Qis a quadrilateral with the domain unit disk} and K0(h) is the extremal maximum dilatation of h.
It is proved thatK q (h)=K 0(h) for everyh in some class of quasisymmetric mappings of the unit circle with substantial points, whereK q (h):=sup{M(h(Q))/M(Q);Q is a quadrilateral with the domain unit disk} andK 0(h) is the extremal maximum dilatation ofh.
