Knot-Removal of Disk B-Spline Curves

Based on the disk arithmetic,we proposed disk B-spline curves,and discussed the ir some properties.We also studied the knot-removal problem of the disk B-spline curves,that is,bounding a disk Bspline curve with an one-knot-removed disk B-spline curve.Two methods were proposed to solve the problem,both of the m can get the analytic solution.