Brazitikos' results on quantitative Helly-type theorems (for the volume and for the diameter) rely on the work of Srivastava on sparsification of John's decompositions. We change this tool by a stronger recent result due to Friedland and Youssef which, together with an appropriate selection in the accuracy of the approximation, allows us to obtain Helly-type versions which are sensitive to the number of convex sets involved.
机构:
East China Normal Univ, Sch Math Sci, 3663 North ZhongShan Rd, Shanghai 200062, Peoples R China
East China Normal Univ, Res Ctr Operator Algebras, 3663 North ZhongShan Rd, Shanghai 200062, Peoples R ChinaEast China Normal Univ, Sch Math Sci, 3663 North ZhongShan Rd, Shanghai 200062, Peoples R China